Wiring Diagrams — part 1 of 2 — 1996 Jeep Grand Cherokee ZJ Service Manual

← Contents  1 2

Pages 485–749 · 60 pages · 26 words repaired

8W-01 GENERAL INFORMATION

INDEX

DESCRIPTION AND OPERATION

CIRCUIT IDENTIFICATION . . . . . . . . . . . . . . . . . . 3 CONNECTOR/GROUND LOCATIONS . . . . . . . . . . 1 CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ELECTROSTATIC DISCHARGE (ESD)

SENSITIVE DEVICES . . . . . . . . . . . . . . . . . . . . 5 HOW TO USE THIS GROUP . . . . . . . . . . . . . . . . 1 NOTES, CAUTIONS, and WARNINGS . . . . . . . . . 1 SECTION IDENTIFICATION . . . . . . . . . . . . . . . . . 1 SPLICE LOCATIONS . . . . . . . . . . . . . . . . . . . . . . 1 SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 TAKE OUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 WIRE CODE IDENTIFICATION . . . . . . . . . . . . . . . 2 DIAGNOSIS AND TESTING

INTERMITTENT AND POOR CONNECTIONS . . . . 5

DESCRIPTION AND OPERATION

HOW TO USE THIS GROUP

The purpose of this group is to show the electrical circuits in a clear, simple fashion and to make troubleshooting easier. Components that work together are shown together. All electrical components used in a specific system are shown on one diagram. The feed for a system is shown at the top of the page. All wires, connectors, splices, and components are shown in the flow of current to the bottom of the page. Wiring which is not part of the circuit represented is referenced to another page/section, where the complete circuit is shown. In addition, all switches, components, and modules are shown in the at rest position with the doors closed and the key removed from the ignition.

If a component is part of several different circuits, it is shown in the diagram for each. For example, the headlamp switch is the main part of the exterior lighting, but it also affects the interior lighting and the chime warning system. It is important to realize that no attempt is made on the diagrams to represent components and wiring as they appear on the vehicle. For example, a short piece of wire is treated the same as a long one. In addition, switches and other components are shown as simply as possible, with regard to function only.

SECTION IDENTIFICATION

Sections in Group 8W are organized by sub-systems. The sections contain circuit operation descrippage page

TROUBLESHOOTING TESTS . . . . . . . . . . . . . . . . 6 TROUBLESHOOTING TOOLS . . . . . . . . . . . . . . . 5 TROUBLESHOOTING WIRING PROBLEMS . . . . . 6 SERVICE PROCEDURES

CONNECTOR AND TERMINAL REPLACEMENT . . 9 CONNECTOR REPLACEMENT . . . . . . . . . . . . . . 8 DIODE REPLACEMENT . . . . . . . . . . . . . . . . . . . 11 TERMINAL REPLACEMENT . . . . . . . . . . . . . . . . 10 TERMINAL/CONNECTOR REPAIR-MOLEX

CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . 7 TERMINAL/CONNECTOR REPAIR—THOMAS

AND BETTS CONNECTORS . . . . . . . . . . . . . . . 8 WIRING REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . 7 SPECIAL TOOLS

WIRING/TERMINAL . . . . . . . . . . . . . . . . . . . . . . 11 tions, helpful information, and system diagrams. The intention is to organize information by system, consistently from year to year.

CONNECTOR/GROUND LOCATIONS

Section 8W-90 contains connector/ground location illustrations. The illustrations contain the connector/ ground number and component identification. Connector/ground location charts in Section 8W-90 reference the illustration number for components and connectors.

Section 8W-80 shows each connector and the circuits involved with that connector. The connectors are identified using the number on the Diagram pages.

SPLICE LOCATIONS

Splice Location charts in Section 8W-70 show the entire splice, and provide references to other sections the splice serves.

Section 8W-95 contains illustrations that show the general location of the splices in each harness. The illustrations show the splice by number, and provide a written location.

NOTES, CAUTIONS, and WARNINGS

Throughout this group additional important information is presented in three ways; Notes, Cautions, and Warnings.

NOTES are used to help describe how switches or components operate to complete a particular circuit. They are also used to indicate different conditions that may appear on the vehicle. For example, an up-to and after condition.

CAUTIONS are used to indicate information that could prevent making an error that may damage the vehicle.

WARNINGS provide information to prevent personal injury and vehicle damage. Below is a list of general warnings that should be followed any time a vehicle is being serviced.

WARNING: ALWAYS WEAR SAFETY GLASSES FOR EYE PROTECTION.

WARNING: USE SAFETY STANDS ANYTIME A PRO- CEDURE REQUIRES BEING UNDER A VEHICLE.

WARNING: BE SURE THAT THE IGNITION SWITCH ALWAYS IS IN THE OFF POSITION, UNLESS THE PROCEDURE REQUIRES IT TO BE ON.

WARNING: SET THE PARKING BRAKE WHEN WORKING ON ANY VEHICLE. AN AUTOMATIC TRANSMISSION SHOULD BE IN PARK. A MANUAL TRANSMISSION SHOULD BE IN NEUTRAL.

WARNING: OPERATE THE ENGINE ONLY IN A WELL-VENTILATED AREA.

WARNING: KEEP AWAY FROM MOVING PARTS WHEN THE ENGINE IS RUNNING, ESPECIALLY THE FAN AND BELTS.

WARNING: TO PREVENT SERIOUS BURNS, AVOID CONTACT WITH HOT PARTS SUCH AS THE RADIA- TOR, EXHAUST MANIFOLD(S), TAIL PIPE, CATA- LYTIC CONVERTER, AND MUFFLER.

WARNING: DO NOT ALLOW FLAME OR SPARKS NEAR THE BATTERY. GASES ARE ALWAYS PRESENT IN AND AROUND THE BATTERY.

WARNING: ALWAYS REMOVE RINGS, WATCHES, LOOSE HANGING JEWELRY, AND LOOSE CLOTH- ING.

WIRE CODE IDENTIFICATION

Each wire shown in the diagrams contains a code (Fig. 1) which identifies the main circuit, part of the main circuit, gauge of wire, and color. The color is shown as a two letter code which can be identified by referring to the Wire Color Code Chart (Fig. 2)

CIRCUIT IDENTIFICATION

All circuits in the diagrams use an alpha/numeric code to identify the wire and its function (Fig. 3). To identify which circuit code applies to a system, refer to the Circuit Identification Code Chart. This chart shows the main circuits only and does not show the secondary codes that may apply to some models.

CONNECTORS

Connectors shown in the diagrams are identified using the international standard arrows for male and female terminals (Fig. 4). A connector identifier is placed next to the arrows to indicate the connector number (Fig. 4).

For viewing connector pin outs, with two terminals or greater, refer to section 8W-80. This section identifies the connector by number and provides terminal numbering, circuit identification, wire colors, and functions.

All connectors are viewed from the terminal end unless otherwise specified. To find the connector location in the vehicle refer to section 8W-90. This section uses the connector identification number from the wiring diagrams to provide a figure number reference.

TAKE OUTS

The abbreviation T/O is used in the component location section to indicate a point in which the wiring harness branches out to a component.

SYMBOLS

Various symbols are used throughout the Wiring Diagrams. These symbols can be identified by referring to the symbol identification chart (Fig. 5).

ELECTROSTATIC DISCHARGE (ESD) SENSITIVE DEVICES

All ESD sensitive components are solid state and a symbol (Fig. 6) is used to indicate this. When handling any component with this symbol comply with the following procedures to reduce the possibility of electrostatic charge build up on the body and inadvertent discharge into the component. If it is not known whether the part is ESD sensitive, assume that it is.

(1) Always touch a known good ground before handling the part. This should be repeated while handling the part and more frequently after sliding across a seat, sitting down from a standing position, or walking a distance.

(2) Avoid touching electrical terminals of the part, unless instructed to do so by a written procedure.

(3) When using a voltmeter, be sure to connect the ground lead first.

(4) Do not remove the part from its protective packing until it is time to install the part.

(5) Before removing the part from its package, ground the package to a known good ground on the vehicle.

DIAGNOSIS AND TESTING

TROUBLESHOOTING TOOLS

When diagnosing a problem in an electrical circuit there are several common tools necessary. These tools are listed and explained below.

• Jumper Wire - This is a test wire used to connect two points of a circuit. It can be used to bypass an open in a circuit.

WARNING: NEVER USE A JUMPER WIRE ACROSS A LOAD, SUCH AS A MOTOR, CONNECTED BETWEEN A BATTERY FEED AND GROUND.

• Voltmeter - Used to check for voltage on a circuit. Always connect the black lead to a known good ground and the red lead to the positive side of the circuit.

CAUTION: Most of the electrical components used in today’s vehicle are solid state. When checking voltages in these circuits use a meter with a 10-megohm or greater impedance.

• Ohmmeter - Used to check the resistance between two points of a circuit. Low or no resistance in a circuit means good continuity.

CAUTION: - Most of the electrical components used in today’s vehicle are Solid State. When checking resistance in these circuits use a meter with a 10-megohm or greater impedance. In addition, make sure the power is disconnected from the circuit. Circuits that are powered up by the vehicle electrical system can cause damage to the equipment and provide false readings.

• Probing Tools - These tools are used for probing terminals in connectors (Fig. 7). Select the proper size tool from Special Tool Package 6807, and insert it into the terminal being tested. Use the other end of the tool to insert the meter probe.

INTERMITTENT AND POOR CONNECTIONS

Most intermittent electrical problems are caused by faulty electrical connections or wiring. It is also possible for a sticking component or relay to cause a problem. Before condemning a component or wiring assembly check the following items.

• Connectors are fully seated • Spread terminals, or terminal push out • Terminals in the wiring assembly are fully seated into the connector/component and locked in position

• Dirt or corrosion on the terminals. Any amount of corrosion or dirt could cause an intermittent problem

• Damaged connector/component casing exposing the item to dirt and moisture

• Wire insulation that has rubbed through causing a short to ground

• Wiring broke inside of the insulation

TROUBLESHOOTING TESTS

Before beginning any tests on a vehicles electrical system use the Wiring Diagrams and study the circuit. Also refer to the Troubleshooting Wiring Problems section in this section.

TESTING FOR VOLTAGE

(1) Connect the ground lead of a voltmeter to a known good ground (Fig. 8).

(2) Connect the other lead of the voltmeter to the selected test point. The vehicle ignition may need to be turned ON to check voltage. Refer to the appropriate test procedure.

TESTING FOR CONTINUITY

(1) Remove the fuse for the circuit being checked or, disconnect the battery.

(2) Connect one lead of the ohmmeter to one side of the circuit being tested (Fig. 9).

(3) Connect the other lead to the other end of the circuit being tested. Low or no resistance means good continuity.

TESTING FOR A SHORT TO GROUND

(1) Remove the fuse and disconnect all items involved with the fuse.

(2) Connect a test light or a voltmeter across the terminals of the fuse.

(3) Starting at the fuse block, wiggle the wiring harness about six to eight inches apart and watch the voltmeter/test lamp.

(4) If the voltmeter registers voltage or the test lamp glows, there is a short to ground in that general area of the wiring harness.

TESTING FOR A SHORT TO GROUND ON FUSES POWERING SEVERAL LOADS

(1) Refer to the wiring diagrams and disconnect or isolate all items on the fused circuit.

(2) Replace the blown fuse. (3) Supply power to the fuse by turning ON the ignition switch or re-connecting the battery.

(4) Start connecting the items in the fuse circuit one at a time. When the fuse blows the circuit with the short to ground has been isolated.

TESTING FOR A VOLTAGE DROP

(1) Connect the positive lead of the voltmeter to the side of the circuit closest to the battery (Fig. 10).

(2) Connect the other lead of the voltmeter to the other side of the switch or component.

(3) Operate the item. (4) The voltmeter will show the difference in voltage between the two points.

TROUBLESHOOTING WIRING PROBLEMS

When troubleshooting wiring problems there are six steps which can aid in the procedure. The steps are listed and explained below. Always check for nonfactory items added to the vehicle before doing any diagnosis. If the vehicle is equipped with these items, disconnect them to verify these add-on items are not the cause of the problem.

(1) Verify the problem. (2) Verify any related symptoms. Do this by performing operational checks on components that are in the same circuit. Refer to the wiring diagrams.

(3) Analyze the symptoms. Use the wiring diagrams to determine what the circuit is doing, where the problem most likely is occurring and where the diagnosis will continue.

(4) Isolate the problem area. (5) Repair the problem. (6) Verify proper operation. For this step check for proper operation of all items on the repaired circuit. Refer to the wiring diagrams.

SERVICE PROCEDURES

WIRING REPAIR

When replacing or repairing a wire, it is important that the correct gauge be used as shown in the wiring diagrams. The wires must also be held securely in place to prevent damage to the insulation.

(1) Disconnect battery negative cable (2) Remove 1 inch of insulation from each end of the wire.

(3) Place a piece of heat shrink tubing over one side of the wire. Make sure the tubing will be long enough to cover and seal the entire repair area.

(4) Spread the strands of the wire apart on each part of the exposed wire (example 1). (Fig. 11)

(5) Push the two ends of wire together until the strands of wire are close to the insulation (example 2) (Fig. 11) (6) Twist the wires together (example 3) (Fig. 11) (7) Solder the connection together using rosin core type solder only. Do not use acid core solder.

(8) Center the heat shrink tubing over the joint, and heat using a heat gun. Heat the joint until the tubing is tightly sealed and sealant comes out of both ends of the tubing.

(9) Secure the wire to the existing ones to prevent chafing or damage to the insulation

(10) Connect battery and test all affected systems.

TERMINAL/CONNECTOR REPAIR-MOLEX CONNECTORS

(1) Disconnect battery. (2) Disconnect the connector from its mating half/ component.

(3) Insert the terminal releasing special tool 6742 into the terminal end of the connector (Fig. 12).

(4) Using special tool 6742 release the locking fingers on the terminal (Fig. 13).

(5) Pull on the wire to remove it from the connector.

(6) Repair or replace the connector or terminal, as necessary.

TERMINAL/CONNECTOR REPAIR—THOMAS AND BETTS CONNECTORS

(1) Disconnect battery. (2) Disconnect the connector from its mating half/ component.

(3) Push in the two lock tabs on the side of the connector (Fig. 14).

Tabs

(4) Insert the probe end of special tool 6934 into the back of the connector cavity (Fig. 15).

(5) Grasp the wire and tool 6934 and slowly remove the wire and terminal from the connector.

(6) Repair or replace the terminal. (7) Install the wire and terminal in the connector. Fully seat the terminal in the connector.

(8) Push in the single lock tab on the side of the connector (Fig. 16).

CONNECTOR REPLACEMENT

(1) Disconnect battery. (2) Disconnect the connector that is to be repaired from its mating half/component

(3) Remove the connector locking wedge, if required (Fig. 17)

(4) Position the connector locking finger away from the terminal using the proper pick from special tool kit 6680. Pull on the wire to remove the terminal from the connector (Fig. 18) (Fig. 19).

(5) Reset the terminal locking tang, if it has one. (6) Insert the removed wire in the same cavity on the repair connector.

(7) Repeat steps four through six for each wire in the connector, being sure that all wires are inserted into the proper cavities. For additional connector pinout identification, refer to the wiring diagrams.

(8) Insert the connector locking wedge into the repaired connector, if required.

(9) Connect connector to its mating half/component.

(10) Connect battery and test all affected systems.

CONNECTOR AND TERMINAL REPLACEMENT

(1) Disconnect battery. (2) Disconnect the connector (that is to be repaired) from its mating half/component.

(3) Cut off the existing wire connector directly behind the insulator. Remove six inches of tape from the harness.

(4) Stagger cut all wires on the harness side at 1/2 inch intervals (Fig. 20). (5) Remove 1 inch of insulation from each wire on the harness side.

(6) Stagger cut the matching wires on the repair connector assembly in the opposite order as was done on the harness side of the repair. Allow extra length for soldered connections. Check that the overall length is the same as the original (Fig. 20).

(7) Remove 1 inch of insulation from each wire. (8) Place a piece of heat shrink tubing over one side of the wire. Be sure the tubing will be long enough to cover and seal the entire repair area.

(9) Spread the strands of the wire apart on each part of the exposed wires.

(10) Push the two ends of wire together until the strands of wire are close to the insulation.

(11) Twist the wires together. (12) Solder the connection together using rosin core type solder only. Do not use acid core solder.

(13) Center the heat shrink tubing over the joint and heat using a heat gun. Heat the joint until the tubing is tightly sealed and sealant comes out of both ends of the tubing

(14) Repeat steps 8 through 13 for each wire. (15) Re-tape the wire harness starting 1-1/2 inches behind the connector and 2 inches past the repair.

(16) Re-connect the repaired connector. (17) Connect the battery, and test all affected systems.

TERMINAL REPLACEMENT

(1) Disconnect battery. (2) Disconnect the connector being repaired from its mating half. Remove connector locking wedge, if required (Fig. 21).

(3) Remove connector locking wedge, if required (Fig. 21).

(4) Position the connector locking finger away from the terminal using the proper pick from special tool kit 6680. Pull on the wire to remove the terminal from the connector (Fig. 22) (Fig. 23).

(5) Cut the wire 6 inches from the back of the connector.

(6) Remove 1 inch of insulation from the wire on the harness side.

(7) Select a wire from the terminal repair assembly that best matches the color wire being repaired.

(8) Cut the repair wire to the proper length and remove 1 inch of insulation.

(9) Place a piece of heat shrink tubing over one side of the wire. Make sure the tubing will be long enough to cover and seal the entire repair area.

(10) Spread the strands of the wire apart on each part of the exposed wires.

(11) Spread the strands of the wire apart on each part of the exposed wires.

(12) Push the two ends of wire together until the strands of wire are close to the insulation.

(13) Twist the wires together. (14) Solder the connection together using rosin core type solder only. Do not use acid core solder.

(15) Center the heat shrink tubing over the joint and heat using a heat gun. Heat the joint until the tubing is tightly sealed and sealant comes out of both ends of the tubing.

(16) Insert the repaired wire into the connector. (17) Install the connector locking wedge, if required, and reconnect the connector to its mating half/component.

(18) Re-tape the wire harness starting 1-1/2 inches behind the connector and 2 inches past the repair.

(19) Connect battery, and test all affected systems.

DIODE REPLACEMENT

(1) Disconnect the battery. (2) Locate the diode in the harness, and remove the protective covering.

(3) Remove the diode from the harness, pay attention to the current flow direction (Fig. 24).

(4) Remove the insulation from the wires in the harness. Only remove enough insulation to solder in the new diode.

(5) Install the new diode in the harness, making sure current flow is correct. If necessary refer to the appropriate wiring diagram for current flow.

(6) Solder the connection together using rosin core type solder only. Do not use acid core solder.

(7) Tape the diode to the harness using electrical tape making, sure the diode is completely sealed from the elements.

(8) Re-connect the battery, and test affected systems.

SPECIAL TOOLS

WIRING/TERMINAL

Probing Tool Package 6807

Terminal Pick 6680

Terminal Removing Tool 6932

Terminal Removing Tool 6934

8W-02 COMPONENT INDEX

GENERAL INFORMATION

INTRODUCTION

This section provides an alphabetical listing of all the components covered in group 8W. For information on system operation, refer to the appropriate section of the wiring diagrams.

8W-11 POWER DISTRIBUTION

DESCRIPTION AND OPERATION

INTRODUCTION

This section covers the power distribution center and all circuits involved with it. For additional information on system operation, refer to the appropriate section of the wiring diagrams.

8W-12 JUNCTION BLOCK

DESCRIPTION AND OPERATION

INTRODUCTION

This section covers the internal circuitry of the junction block. For additional information on system operation, refer to the appropriate group of the wiring diagrams. Group 02 lists components and corresponding wiring diagram groups.

8W-15 GROUND DISTRIBUTION

DESCRIPTION AND OPERATION

INTRODUCTION

This section identifies the grounds, splices that connect to those grounds, and the components that connect those grounds. For additional information on system operation, refer to the appropriate section of the wiring diagrams. For an illustration of the physical location of each ground, refer to group 8W-90.

8W-20 CHARGING SYSTEM

DESCRIPTION AND OPERATION

CHARGING SYSTEM

The charging system is an integral part of the battery and starting systems. Because all these systems work in conjunction, diagnose and test them together.

Circuit A11 connects to the generator output terminal and the Power Distribution Center (PDC). Circuit A0 connects the battery to the PDC. Circuit Z0 provides ground for the generator.

When the ignition switch is in either the START or RUN positions, it connects circuit A1 from fuse 8 in the PDC to circuit A21. Circuit A21 powers circuit F99 through fuse 18 in the PDC. Circuit F99 splices to supply current to the coil side of the Automatic Shut Down (ASD) relay. The Powertrain Control Module (PCM) provides ground for the relay on circuit K900. Circuit K900 connects to cavity C3 of the PCM.

When the PCM grounds the ASD relay, contacts inside the relay close and connect circuit F5 from the fuse 20 in the PDC to circuit A142. Circuit A142 splices to the generator field terminal.

The PCM has an internal voltage regulator that controls generator output. The PCM controls the generator field on circuit K20. Circuit K20 connects to PCM cavity B10.

When the engine operates and there is current in the generator field, the generator produces a B+ voltage. The generator supplies B+ voltage to the battery through the A11 and A0 circuits.

HELPFUL INFORMATION

• Circuit A21 passes through the junction block before reaching fuse 18 in the PDC.

• The ASD relay supplies battery voltage for the fuel injectors, ignition coil, and the heated oxygen sensors.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-21 STARTING SYSTEM

DESCRIPTION AND OPERATION

STARTING SYSTEM

Circuit A0 from the battery is double crimped at the positive battery post. One branch of circuit A0 (battery positive cable) connects to the engine starter motor. The other A0 branch supplies voltage to the Power Distribution Center (PDC).

Circuit A1 from fuse 8 in the PDC supplies battery voltage to the contact side of the engine starter motor relay. When the coil side of the engine starter motor relay energizes, the contacts close and connect circuit A1 to circuit T40. Circuit T40 supplies battery voltage to the starter motor solenoid.

The ignition switch supplies battery voltage to the coil side of the starter motor relay on circuit A41 when the key is moved to the START position and the PARK/NEUTRAL position switch is closed. Ground for the coil side of the starter motor relay is supplied by the case grounded PARK/NEUTRAL position switch. Circuit T41 connects the coil side of the relay to the PARK/NEUTRAL position switch.

When the starter motor relay energizes and the contacts close, circuit T40 supplies battery voltage to the starter motor solenoid. Circuit A0 from the battery supplies voltage to the starter motor when the solenoid energizes.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-30 FUEL/IGNITION SYSTEMS

INDEX

DESCRIPTION AND OPERATION

AUTOMATIC SHUT DOWN (ASD) RELAY . . . . . . . 1 BATTERY FEED . . . . . . . . . . . . . . . . . . . . . . . . . . 1 BATTERY TEMPERATURE SENSOR . . . . . . . . . . 2 CAMSHAFT POSITION SENSOR . . . . . . . . . . . . . 3 CCD BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CRANKSHAFT POSITION SENSOR . . . . . . . . . . . 3 DATA LINK CONNECTOR . . . . . . . . . . . . . . . . . . . 1 DUTY CYCLE EVAP\PURGE SOLENOID . . . . . . . 5 ENGINE COOLANT TEMPERATURE SENSOR . . . 3 EVAPORATIVE SYSTEM LEAK DETECTION

PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . . 4 FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . . . 2

DESCRIPTION AND OPERATION

IGNITION SWITCH

Circuit A1 from fuse 8 in the Power Distribution Center (PDC) powers four different circuits through the ignition switch. When the ignition switch is in the START or RUN position, it connects circuit A1 to circuit A21.

In the ACCESSORY or RUN position, the ignition switch connects to circuit A31. In the START position, the ignition switch connects circuit A1 to circuit A41. When the ignition switch is in the RUN position it connects circuit A1 to circuit A22.

Also in the START position, the case grounded ignition switch grounds circuit G9 from the brake warning switch.

BATTERY FEED

Circuit F5 from fuse 20 in the Power Distribution Center (PDC) supplies battery voltage to cavity A22 of the Powertrain Control Module (PCM). Circuit A7 from PDC fuse 15 also powers the PDC at cavity A14.

HELPFUL INFORMATION

Circuit F5 also supplies power to the contact sides of the Automatic Shut Down (ASD) relay.

GROUND

Circuit Z12 connects to cavities A31 and A32 of the PCM. The Z12 circuit provides ground for PCM internal drivers that operate high current devices like the injectors and ignition coil.

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FUEL PUMP RELAY . . . . . . . . . . . . . . . . . . . . . . . 2 GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HEATED OXYGEN SENSORS . . . . . . . . . . . . . . . 2 IDLE AIR CONTROL (IAC) MOTOR . . . . . . . . . . . 5 IGNITION COIL . . . . . . . . . . . . . . . . . . . . . . . . . . 5 IGNITION SWITCH . . . . . . . . . . . . . . . . . . . . . . . . 1 INTAKE AIR TEMPERATURE SENSOR . . . . . . . . . 4 MANIFOLD ABSOLUTE PRESSURE SENSOR . . . 4 OIL PRESSURE SENSOR . . . . . . . . . . . . . . . . . . 4 THROTTLE POSITION SENSOR . . . . . . . . . . . . . 3 VEHICLE SPEED SENSOR . . . . . . . . . . . . . . . . . 2 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 5

Internal to the PCM, the ground circuit connects to the PCM sensor return circuit (from circuit K4).

HELPFUL INFORMATION

• If the system loses ground for the Z12 circuits, the vehicle will not operate. Check the connection at the ganged-ground circuit eyelet.

DATA LINK CONNECTOR

Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F75 through fuse 7 in the junction block. Circuit F75 supplies battery voltage to the data link connector.

Circuit D84 connects to cavity C29 of the PCM. Circuit D84 is the SCI transmit circuit for the Powertrain Control Module (PCM). Circuit D83 connects to cavity C27 of the PCM and cavity A3 of the Controller- Anti Lock Brakes. Circuit D83 is the SCI receive circuit for the PCM.

Circuits D98 and D99 from the speed proportional steering module connect to the data link connector.

Circuits Z1 and Z2 provide ground for the data link connector.

AUTOMATIC SHUT DOWN (ASD) RELAY

When the ignition switch is in either the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18. Circuit F99 feeds the coil side of the Automatic Shut Down (ASD) relay. The Powertrain Control Module (PCM) provides ground for the relay on circuit K900. Circuit K900 connects to cavity C3 of the PCM.

When the PCM grounds the ASD relay, contacts inside the relay close and connect circuit F5 from fuse 20 in the PDC to circuit A142. Circuit A142 splices to the generator field terminal, fuel injectors, ignition coil and the upstream and downstream heated oxygen sensors. Circuit A142 also connects to cavity C12 of the PCM.

HELPFUL INFORMATION

Along with supplying voltage to the coil side of the ASD relay, circuit F99 also supplies voltage to the coil side of the fuel pump relay.

FUEL PUMP RELAY

When the ignition switch is in either the START or RUN positions, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18. Circuit F99 supplies battery voltage to the coil side of the fuel pump relay. The Powertrain Control Module (PCM) provides ground for the relay on circuit K81. Circuit K81 connects to cavity C19 of the PCM.

When the PCM grounds the fuel pump relay, contacts inside the relay close and connect circuit A61 from fuse 16 in the PDC to circuit A64. Circuit A64 feeds the fuel pump motor (part of the in-tank fuel pump module).

HELPFUL INFORMATION

Circuit F99 also powers the coil side of the Automatic Shut Down (ASD) relay.

FUEL PUMP MODULE

The in-tank fuel pump module contains the fuel pump motor and fuel level sensor.

FUEL PUMP MOTOR

When the fuel pump relay contacts close, the relay feeds the fuel pump motor. Circuit A64 from the relay powers the fuel pump module. Circuit Z1 provides ground for the fuel pump motor.

FUEL LEVEL SENSOR

The fuel level sensor is a variable resistor. Circuit G40 provides the fuel level input to cavity C26 of the Powertrain Control Module (PCM). The PCM broadcasts fuel level data on the CCD bus. The micro-processor in the instrument cluster receives the message on the CCD bus, calculates fuel gauge needle position and adjusts the gauge.

VEHICLE SPEED SENSOR

Circuit K6 supplies 5 volts from the Powertrain Control Module (PCM) to the vehicle speed sensor. The K6 circuit connects to cavity B31 of the PCM.

Circuit G7 from the vehicle speed sensor provides an input signal to the PCM. The G7 circuit connects to cavity B27 of the PCM.

The PCM provides a ground for the vehicle speed sensor signal (circuit G7) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

Circuit K4 splices to supply ground for the signals from the following:

• Heated oxygen sensor • Camshaft position sensor • Crankshaft position sensor • Throttle position sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Intake air temperature sensor

HEATED OXYGEN SENSORS

When the Automatic Shut Down (ASD) relay contacts close, circuit A142 supplies voltage to the upstream and downstream heated oxygen sensors.

Circuit K41 delivers the signal from the upstream heated oxygen sensor to the Powertrain Control Module (PCM). Circuit K41 connects to cavity A24 of the PCM. Circuit K141 supplies the signal from the downstream heated oxygen sensor to the PCM. Circuit K141 connects to PCM cavity A25.

The PCM provides a ground for the heated oxygen sensor signals (circuits K41 and K141) through circuit K4. Circuit K4 connects to cavity A4 of the PCM connector.

Circuit Z12 provides ground for the heater circuit in each sensor.

HELPFUL INFORMATION

Circuit A142 also supplies battery voltage to the fuel injectors, ignition coil, and generator.

Circuit K4 splices to supply ground for the signals from the following:

• Camshaft position sensor • Crankshaft position sensor • Intake air temperature sensor • Throttle position sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Vehicle speed sensor

BATTERY TEMPERATURE SENSOR

The Powertrain Control Module (PCM) determines battery temperature on circuit T222. Circuit T222 connects the PCM to the battery temperature sensor. Circuit T222 connects to cavity C15 of the PCM. Circuit K4 provides ground for the sensor and connects to PCM cavity A4.

CRANKSHAFT POSITION SENSOR

The Powertrain Control Module (PCM) supplies 5 volts to the crankshaft position sensor on circuit K25. Circuit K25 connects to cavity A17 of the PCM.

The PCM receives the crankshaft position sensor signal on circuit K27. Circuit K27 connects to cavity A8 of the PCM.

The PCM provides a ground for the crankshaft position sensor (circuit K27) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

• Circuit K25 splices to supply 5 volts to the camshaft position sensor, manifold absolute pressure sensor and throttle position sensor.

Circuit K4 splices to supply ground for the signals from the following:

• Upstream and downstream heated oxygen sensor

• Camshaft position sensor • Intake air temperature sensor • Throttle position sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Vehicle speed sensor

CAMSHAFT POSITION SENSOR

The Powertrain Control Module (PCM) supplies 5 volts to the camshaft position sensor (in distributor) on circuit K25. Circuit K25 connects to cavity A17 of the PCM.

The PCM receives the camshaft position sensor signal on circuit K24. Circuit K24 connects to cavity A18 of the PCM.

The PCM provides a ground for the camshaft position sensor signal (circuit K24) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

• Circuit K25 splices to supply 5 volts to the crankshaft position sensor, manifold absolute pressure sensor, and throttle position sensor.

Circuit K4 splices to supply ground for the signals from the following:

• Upstream and downstream heated oxygen sensors

• Crankshaft position sensor • Intake air temperature sensor • Throttle position sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Vehicle speed sensor

ENGINE COOLANT TEMPERATURE SENSOR

The engine coolant temperature sensor provides an input to the Powertrain Control Module (PCM) on circuit K2. From circuit K2, the engine coolant temperature sensor draws up to 5 volts from the PCM. The sensor is a variable resistor. As coolant temperature changes, the resistance in the sensor changes, causing a change in current draw. The K2 circuit connects to cavity A16 of the PCM.

The PCM provides a ground for the engine coolant temperature sensor signal (circuit K2) through circuit K4. Circuit K4 connects to cavity A4 of the PCM connector.

HELPFUL INFORMATION

Circuit K4 splices to supply ground for the signals from the following:

• Battery temperature sensor • Camshaft position sensor • Crankshaft position sensor • Intake air temperature sensor • Throttle position sensor • Manifold absolute pressure sensor • Upstream and downstream heated oxygen sensor

• Vehicle speed sensor

EVAPORATIVE SYSTEM LEAK DETECTION PUMP

Vehicle built for sale in the State of California are equipped with an evaporative system leak detection pump.

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18. Circuit F99 feeds the leak detection pump.

On circuits J96 and J95, the PCM operates the leak detection pump. Circuit J96 connects to cavity C14 of the PCM. Circuit J95 connects to PCM cavity C10.

THROTTLE POSITION SENSOR

From the Powertrain Control Module (PCM), circuit K25 supplies 5 volts to the throttle position sensor (TPS). Circuit K25 connects to cavity A17 of the PCM.

Circuit K22 delivers the TPS signal to the PCM. Circuit K22 connects to cavity A23 of the PCM.

The PCM provides a ground for the throttle position sensor signal (circuit K22) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

Refer to Group 14 for throttle position sensor operation.

Circuit K25 splices to supply 5 volts to the manifold absolute pressure sensor, camshaft position sensor, and crankshaft position sensor.

Circuit K4 splices to supply ground for the signals from the following:

• Upstream and downstream heated oxygen sensors

• Camshaft position sensor • Crankshaft position sensor • Intake air temperature sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Vehicle speed sensor

MANIFOLD ABSOLUTE PRESSURE SENSOR

From the Powertrain Control Module (PCM), circuit K25 supplies 5 volts to the manifold absolute pressure (MAP) sensor. Circuit K25 connects to cavity A17 of the PCM.

Circuit K70 delivers the MAP signal to the PCM. Circuit K70 connects to cavity A27 of the PCM.

The PCM provides a ground for the MAP sensor signal (circuit K70) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

Refer to Group 14 for MAP sensor operation. Circuit K25 splices to supply 5 volts to the camshaft position sensor, crankshaft position sensor and throttle position sensor.

Circuit K4 splices to supply ground for the signals from the following:

• Upstream and downstream heated oxygen sensors

• Camshaft position sensor • Crankshaft position sensor • Intake air temperature sensor • Throttle position sensor • Engine coolant temperature sensor • Vehicle speed sensor

INTAKE AIR TEMPERATURE SENSOR

The intake air temperature sensor provides an input to the Powertrain Control Module (PCM) on circuit K21. Circuit K21 connects to cavity A15 of the PCM.

From circuit K21, the intake air temperature sensor draws voltage from the PCM. The sensor is a variable resistor. As intake air temperature changes, the resistance in the sensor changes, causing a change in current draw.

The PCM provides a ground for the intake air temperature sensor signal (circuit K21) through circuit K4. Circuit K4 connects to cavity A4 of the PCM.

HELPFUL INFORMATION

Circuit K4 splices to supply ground for the signals from the following:

• Upstream and downstream heated oxygen sensors

• Camshaft position sensor • Crankshaft position sensor

• Throttle position sensor • Manifold absolute pressure sensor • Engine coolant temperature sensor • Vehicle speed sensor

OIL PRESSURE SENSOR

The oil pressure sensor is a variable resistor. A change in engine oil pressure changes the resistance in the sending unit which alters the signal sensed by the Powertrain Control Module on circuit G6. Circuit G6 connects to cavity B23 of the PCM.

The PCM provides ground for the oil pressure sensor on circuit K4. Circuit K4 connects to cavity A4 of the PCM.

The PCM broadcasts the oil pressure data on the CCD bus. The micro-processor in the instrument cluster receives the signal from the CCD bus, calculates oil pressure and adjusts the gauge needle position.

The Body Control Module (BCM) also receives the oil pressure data broadcast by the PCM on the CCD bus. If oil pressure drops below a calibrated pressure, the BCM sounds an audible chime and illuminates the oil pressure warning lamp.

FUEL INJECTORS

When the Automatic Shut Down (ASD) relay contacts close, they connect circuit A142 supplies voltage to the fuel injectors. Each injector has a separate ground circuit controlled by the Powertrain Control Module (PCM).

Circuit K11 provides ground for injector number one. The K11 circuit connects to cavity B4 of the PCM.

Circuit K12 provides ground for injector number two. The K12 circuit connects to cavity B15 of the PCM.

Circuit K13 provides ground for injector number three. The K13 circuit connects to cavity B5 of the PCM.

Circuit K14 provides ground for injector number four. The K14 circuit connects to cavity B16 of the PCM.

Circuit K38 provides ground for injector number five. The K38 circuit connects to cavity B6 of the PCM.

Circuit K58 provides ground for injector number six. The K58 circuit connects to cavity B12 of the PCM.

On the 5.2L engine, circuit K17 provides ground for injector number seven. The K17 circuit connects to cavity B2 of the PCM.

Also on the 5.2L engine, circuit K18 provides ground for injector number eight. The K18 circuit connects to cavity B13 of the PCM.

HELPFUL INFORMATION

• Circuit A142 splices to supply voltage to the fuel injectors, ignition coil, PCM, generator, and heated oxygen sensors.

• For information about fuel injector operation, refer to Group 14.

IGNITION COIL

When the Automatic Shut Down (ASD) relay contacts close, circuit A142 supplies voltage to the ignition coil. The Powertrain Control Module (PCM) controls the ground path for the ignition coil on circuit K19. Circuit K19 connects to cavity A7 of the PCM.

HELPFUL INFORMATION

Circuit A142 splices to supply voltage to the fuel injectors, PCM, heated oxygen sensors, and generator.

IDLE AIR CONTROL (IAC) MOTOR

The Powertrain Control Module (PCM) operates the idle air control motor through 4 circuits; K39, K40, K59, and K60. Each circuit connects to separate cavities in the PCM connector.

• Circuit K39 connects to cavity A20 of the PCM • Circuit K40 connects to cavity A11 of the PCM • Circuit K59 connects to cavity A10 of the PCM • Circuit K60 connects to cavity A19 of the PCM

DUTY CYCLE EVAP\PURGE SOLENOID

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18. Circuit F99 powers to the Duty Cycle EVAP/Purge solenoid.

The Powertrain Control Module (PCM) provides the ground path for the solenoid on circuit K52. Circuit K52 connects to cavity C20 of the PCM.

CCD BUS

Circuits D1 and D2 connect the Powertrain Control Module (PCM) to the CCD Bus. Circuit D1 connects to cavity C30 of the PCM. Circuit D2 connects to cavity C28 of the PCM. Circuits D1 and D2 are a twisted pair of wires.

Several modules and controllers broadcast and receive data on the CCD Bus. Each module or controller is enabled to receive only certain messages. The PCM broadcasts the following messages on the CCD bus.

• Engine RPM • Injector on-time and distance pulses • Vehicle speed • Engine temperature • Battery temperature • Oil pressure

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-31 TRANSMISSION CONTROL SYSTEM

INDEX

DESCRIPTION AND OPERATION

GOVERNOR PRESSURE SENSOR . . . . . . . . . . . 1 OUTPUT SHAFT SPEED SENSOR . . . . . . . . . . . . 1 OVERDRIVE SWITCH . . . . . . . . . . . . . . . . . . . . . 1 SHIFT INTERLOCK . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

OVERDRIVE SWITCH

Automatic transmission equipped vehicles have an overdrive switch. The operator disables or enables overdrive when the switch is depressed.

The overdrive system consists of a switch connected to the Powertrain Control Module (PCM) and a Light Emitting Diode (LED) which illuminates for the overdrive ON/OFF indicator.

If overdrive is currently enabled, it is disabled when the operator depresses the overdrive switch. Also, if the operator already disabled overdrive, it is enabled when the switch is depressed.

Circuit T9 from the overdrive switch connects to cavity C13 of the PCM and provides the overdrive signal. Circuit Z1 provides ground for the switch.

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) with circuit A22. Circuit A22 powers circuit F71 through fuse 12 in the junction block. Circuit F71 supplies power for the overdrive ON/OFF indicator LED. The PCM turns the overdrive ON/OFF indicator ON or OFF by providing ground on circuit G68. Circuit G68 connects to cavity C6 of the PCM.

TRANSMISSION CONTROL RELAY

The transmission control relay powers the overdrive solenoid, torque convertor clutch solenoid, and variable force solenoid. All three solenoids are molded together.

When the ignition switch is in the START or RUN positions, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F99 through fuse 18 in the PDC. Circuit F99 powers the coil side of the electronic transmission relay. The Powertrain Control Module (PCM) provides ground for the relay on circuit T66. Circuit T66 connects to cavity B30 of the PCM.

When the PCM grounds the relay, the relay contacts connect circuit F92 from fuse 17 in the PDC to circuit T20. Circuit T20 powers the solenoids.

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TRANSMISSION CONTROL RELAY . . . . . . . . . . . 1 TRANSMISSION SOLENOID ASSEMBLY . . . . . . . 1 TRANSMISSION TEMPERATURE SENSOR . . . . . 2 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

TRANSMISSION SOLENOID ASSEMBLY

The Torque Convertor Clutch (TCC) solenoid, overdrive solenoid and variable force solenoid are molded together. Circuit T20 from the electronic transmission relay supplies power for the solenoids. The Powertrain Control Module (PCM) operates each solenoid individually by providing ground for each solenoid on separate circuits.

• The PCM provides ground for the TCC solenoid on circuit T22. Circuit T22 connects to cavity B11 of the PCM.

• The PCM supplies ground for the overdrive solenoid on circuit T60. Circuit T60 connects to cavity B21 of the PCM.

• On circuit T59, the PCM provides ground for the variable force solenoid. Circuit T59 connects to cavity B8 of the PCM.

SHIFT INTERLOCK

The shift interlock prevents the operator from shifting the vehicle out of PARK unless the brake pedal is pressed. When the ignition switch is in the START or RUN position, circuit A21 feeds circuit F87 through fuse 5 in the junction block. Circuit F87 splices to power the shift interlock.

When the brake pedal is not depressed, the stop lamp switch provides ground for interlock by connecting circuit L53 to ground. When grounded, the interlock prevents shifting the transmission out of PARK. When the brake pedal is pressed, the stop lamp switch disconnects circuit L53 from ground.

OUTPUT SHAFT SPEED SENSOR

The output shaft speed sensor generates a signal indicating the speed of the transmission output shaft. Circuits T13 and T14 connect the sensor to the Powertrain Control Module (PCM). Circuit T13 connects to cavity B25 of the PCM. Circuit T14 connects to cavity B28.

GOVERNOR PRESSURE SENSOR

The governor pressure sensor supplies the transmission pressure input to the Powertrain Control

Module on circuit T25. Circuit T25 connects to cavity B29 of the PCM. Circuit K6 from cavity B31 of the PCM supplies 5 volts to the sensor. The PCM provides ground for the govenor pressure sensor on circuit K4. Circuit K4 connects to cavity A4 of the PCM.

The governor pressure sensor is part of the transmission solenoid assembly.

TRANSMISSION TEMPERATURE SENSOR

The transmission temperature sensor is located in the transmission solenoid assembly. The Powertrain Control Module (PCM) supplies 5 volts to the sensor on circuit K6. Circuit T54 from the sensor connects to cavity B1 of the PCM and provides the transmission temperature input. The PCM provides ground for the sensor on cavity K4.

If transmission temperature exceeds a calibrated temperature, the PCM sends a signal to the Vehicle Information Center (VIC) over the CCD bus. In response, the VIC displays a message to the driver.

HELPFUL INFORMATION

Circuit K6 also supplies 5 volts to the vehicle speed sensor.

Circuit K4 also provides ground for the signals from the following:

• Heated oxygen sensors • Crankshaft position sensor • Camshaft position sensor • Engine coolant temperature sensor • Intake air temperature sensor • Throttle position sensor • Manifold absolute pressure sensor • Vehicle speed sensor

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-33 VEHICLE SPEED CONTROL

DESCRIPTION AND OPERATION

VEHICLE SPEED CONTROL

The Powertrain Control Module (PCM) operates the vehicle speed control system. The vehicle speed control switches are located in the steering wheel.

Circuit V32 from cavity C11 of the PCM connects to circuit V30 through the stop lamp switch. Circuit V30 powers the vehicle speed control servo.

Circuit K95 from PCM cavity C32 connects to the vehicle speed control switches. The switches are wired in parallel and each contains a separate resistor. The voltage level present on circuit K95 (at PCM cavity C32) depends on which speed control switch is selected. Circuit K4 from PCM cavity A4 supplies ground for the speed control switches.

• When the ON/OFF switch is open, the voltage level on circuit K95 at PCM cavity C32 has a nominal value of 5.0 volts with a range from 4.8 to 5.0 volts.

• When the ON/OFF switch closes, the voltage level on circuit K95 at PCM cavity C32 has nominal value of 1.51 volts with a range from 1.31 to 1.61 volts.

• When the SET switch closes, the voltage level on circuit K95 at PCM cavity C32 has nominal value of 3.8 volts with a range from 3.6 to 3.9 volts. • When the RESUME/ACCEL switch closes, the voltage level on circuit K95 at PCM cavity C32 has nominal value of 4.4 volts with a range from 4.2 to 4.5 volts. • When the COAST switch closes, the voltage level on circuit K95 at PCM cavity C32 has nominal value of 2.92 volts with a range from 2.72 to 3.02 volts.

• When the CANCEL switch closes, the voltage level on circuit K95 at PCM cavity C32 has is 0.1 volts or less.

The PCM controls the vent and vacuum functions of the vehicle speed control servo on circuits V35 and V36. Depending on the signal it receives from vehicle speed control switches, the PCM either applies vacuum to or vents vacuum from the servo. Circuit V36 from cavity C4 of the PCM sends the vacuum signal to the servo. Circuit V35 from cavity C5 sends the vent signal.

Circuit L53 provides the stop lamp switch sense input to the PCM at cavity C24. The stop lamp switch connects circuit L53 to ground on circuit Z1. When the brake pedal is depressed, the stop lamp switch opens and disconnects circuits L53 and Z1, and circuits V32 and V30. When the stop lamp switch disconnects circuits V32 and V30, power is removed from the speed control servo.

HELPFUL INFORMATION

Circuit K4 also provides ground for some of the engine control sensors that provide inputs to the PCM.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-35 ALL-WHEEL ANTI-LOCK BRAKES

INDEX

DESCRIPTION AND OPERATION

ABS MAIN RELAY . . . . . . . . . . . . . . . . . . . . . . . . 1 ABS PUMP MOTOR RELAY . . . . . . . . . . . . . . . . . 1 ABS WARNING LAMP . . . . . . . . . . . . . . . . . . . . . 2 DATA LINK CONNECTOR . . . . . . . . . . . . . . . . . . . 2 G-SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

Several fuses supply power for the Anti-Lock Brake System (ABS); fuses 5, 8, 11 and 14 in the Power Distribution Center (PDC) and fuses 5, 9, 11 in the junction block. Fuses 5, 8, 11 and 14 in the PDC are connected directly to battery voltage and are HOT all times. Fuse 5 in the junction block is HOT when the ignition switch is the START or RUN position. Fuse 11 in the junction block is HOT when the ignition switch is in the RUN position. Fuse 9 in the junction block is HOT at all times.

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the PDC with circuit A22. Circuit A22 feeds circuit F12 through fuse 11 in the junction block. Circuit F12 connects to the coil side of the ABS main relay and the Controller, Anti-Lock Brakes (CAB).

Circuit Z2 provides ground for the CAB. Circuit Z2 connects to cavities 14 and 13 of the CAB.

Refer to group 5, Brakes for operational descriptions of ABS system components.

WHEEL SPEED SENSORS

The all wheel anti-lock system uses four wheel speed sensors; one for each wheel. Each sensor converts wheel speed into an electrical signal that it transmits to the Controller, Anti-Lock Brakes (CAB). A pair of twisted wires connect to each sensor to provide signals to the CAB.

Circuits B6 and B7 provide signals to the CAB from the right front wheel speed sensor. Circuit B6 which provides the LOW signal connects to cavity 2 of the CAB. Circuit B7 connects to cavity 1 of the CAB and provides the HIGH signal.

Circuits B8 and B9 provide signals to the CAB from the left front wheel speed sensor. Circuit B8, which provides the HIGH signal, connects to cavity 10 of the CAB. Circuit B9 connects to cavity 9 of the CAB and provides the LOW signal.

page page

HYDRAULIC CONTROL UNIT . . . . . . . . . . . . . . . . 2 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 STOP LAMP SWITCH INPUT . . . . . . . . . . . . . . . . 2 WHEEL SPEED SENSORS . . . . . . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

Circuits B1 and B2 provide signals to the CAB from right rear wheel speed sensor. Circuit B1 which provides the LOW signal connects to cavity A11 of the CAB. Circuit B2 connects to cavity A12 and provides the HIGH signal.

Circuits B4 and B3 provide signals to the CAB from the left rear wheel speed sensor. Circuit B3, which provides the LOW signal, connects to cavity A9 of the CAB. Circuit B4 connects to cavity A10 and provides the HIGH signal.

G-SWITCH

During four-wheel drive operation, the G-switch provides deceleration data to the Controller, Anti- Lock Brakes (CAB). Refer to Group 5, Brakes for additional information.

Circuits B41, B42, and B43 connect the G-switch to the CAB. Circuits B41 and B42 provide switch states while circuit B43 provides ground. At the CAB, circuit B41 connects to cavity A6, circuit B42 connects to cavity A7 and circuit B43 connects to cavity A2.

ABS MAIN RELAY

The ABS main relay is located in the Power Distribution Center (PDC). When the Controller, Anti-Lock Brakes (CAB) grounds the ABS main relay coil on circuit B58, the relay switches to connect circuit A20 from PDC fuse 14 to circuit B47. Circuit F12 from fuse 11 in the junction block splices to feed the coil side of the ABS main relay. Circuit B58 connects to cavity 11 of the CAB.

Circuit B47 splices to power to the coil side of the ABS pump motor relay. Other branches of circuit B47 connects to cavity 5 of the CAB and to the hydraulic control unit.

ABS PUMP MOTOR RELAY

The ABS pump motor relay in the power distribution center (PDC) supplies voltage to the ABS pump motor. When the ABS main relay energizes, circuit B47 supplies battery voltage to the coil side of the ABS pump motor relay. The Controller, Anti-Lock

Brakes (CAB) provides ground for the relay on circuit B116. Circuit B116 connects to cavity 7 of the CAB.

When the ABS pump motor energizes, it connects circuit A10 from PDC fuse 5 to circuit B82. Circuit B82 supplies battery voltage to the pump motor. Circuit Z2 provides ground for the pump motor.

HYDRAULIC CONTROL UNIT

When the ABS main relay energizes, two branches of circuit B47 splice to supply voltage to the isolation and dump solenoids in the hydraulic control unit. The hydraulic control unit contains three separate inlet valves and three separate outlet valves. The Controller, Anti-Lock Brakes (CAB) activates the inlet and outlet valves by providing separate ground paths for each.

The CAB provides a ground path for the rear inlet valve on circuit B251. Circuit B251 connects to cavity 4 of the CAB. For the right front inlet valve, the CAB provides a ground path on circuit B249. Circuit B249 connects to cavity 15 of the CAB.

On circuit B245, the CAB provides ground for the left front inlet valve. Circuit B245 connects to cavity 18 of the CAB. The CAB provides a ground path for the rear outlet valve on circuit B254. Circuit B254 connects to cavity 12 of the CAB.

For the right front outlet valve, the CAB provides a ground path on circuit B248. Circuit B248 connects to cavity 6 of the CAB.

On circuit B243, the CAB provides ground for the left outlet valve. Circuit B243 connects to cavity 8 of the CAB.

ABS WARNING LAMP

Circuit F87 from fuse 5 in the junction block provides power for the ABS warning lamp in the instrument cluster. Ground for the ABS warning lamp is provided by either the Controller, Anti-Lock Brakes (CAB) or by the ABS main relay when the relay is not energized. The CAB illuminates the lamp by providing ground on circuit B205.

Circuit B205 splices to connect to circuit B47 through a diode. When the ABS main relay is not energized, it connects circuit B47 to ground on circuit Z4. The ground path for the warning lamp is through the diode to circuit B47, through the ABS main relay to ground on circuit Z4.

The diode between circuit B205 and B47 prevents voltage from flowing to the CAB when the ABS main relay switches to supply power on circuit B47.

HELPFUL INFORMATION

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F87 through fuse 5 in the junction block.

STOP LAMP SWITCH INPUT

Circuit L50 from the stop lamp switch provides the brake switch input to the Controller, Anti-Lock Brakes (CAB). When the brake pedal is depressed, the stop lamp switch closes to supply battery voltage from circuit L16 to circuit L50. Circuit L50 connects to cavity A8 of the CAB. Circuit L16 originates at fuse 9 in the junction block. Circuit A250 from fuse 11 in the Power Distribution Center (PDC) supplies power to junction block fuse 9.

DATA LINK CONNECTOR

Circuit D83 from cavity A3 of the Controller, Anti- Lock Brakes (CAB) transmits data to the DRB scan tool through the data link connector. Through the data link connector, circuits Z1 and Z1 provide ground for the DRB scan tool.

Circuit F75 supplies battery voltage to the scan tool through the diagnostic connector.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-39 VEHICLE THEFT SECURITY SYSTEM

INDEX

DESCRIPTION AND OPERATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 VEHICLE THEFT SECURITY SYSTEM

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

The Body Control Module (BCM) operates the Vehicle Theft Security System (VTSS). The BCM monitors the vehicle doors, hood, liftglass in the liftgate, liftgate, and ignition for unauthorized operation.

When the BCM detects unauthorized operation, it operates the horn repeatedly for three minutes and flashes the headlamps and tail lamps for 15 minutes. Also, the engine will not operate until the VTSS is disarmed.

The vehicle operator can activate the alarm by pushing the panic button on the Remote Keyless Entry (RKE) transmitter. When the operator pushes the panic button, the radio frequency receiver in the Passenger Door Module (PDM) receives the PANIC signal and broadcasts a message on the CCD bus. When the BCM sees the PANIC message on the CCD bus, it operates the horn repeatedly, turns on the interior lights, and flashes the headlamps and tail lamps. The BCM activates the panic alarm for three minutes unless the operator starts the vehicle and drives at a speed above 15 MPH or pushes the panic button on the RKE transmitter a second time.

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the PDC to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 18. Circuit F99 feeds the BCM.

In the ACCESSORY or RUN position, the ignition switch connects circuit A1 to circuit A31. Circuit A31 powers circuit V23 through fuse 3 in the junction block. Circuit V23 feeds the BCM.

VEHICLE THEFT SECURITY SYSTEM OPERATION

Each door, the liftgate, hood, and the liftglass in the liftgate have an ajar switch that connects to the Body Control Module (BCM). The ajar switches are normally open when the doors, liftgate, liftglass and hood are closed. When one of them open, its ajar switch closes and connects the BCM to ground. In response, if the Vehicle Theft Security System is page page

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2 armed, the BCM starts the alarm. Refer to the Introduction in this section for alarm information.

The BCM receives the ajar switch signals on the following circuits.

• Circuit G75 provides the left front door ajar switch signal

• Circuit G74 provides the right front door ajar switch signal

• Circuit G77 provides the left rear door ajar switch signal

• Circuit G76 provides the right rear door ajar switch signal

• Circuit G78 provides the liftgate ajar and liftglass ajar signals

SYSTEM ARMING

The system alarm sets after the operator uses the power door locks or Remote Keyless Entry (RKE) transmitter to lock the doors and liftgate. After all doors and the liftgate are locked and closed, the BCM illuminates a red Light Emitting Diode (LED) (VTSS indicator light) on circuit G69. The red LED is located on the top of the instrument panel. The LED flashes rapidly signalling the system is arming. It flashes at slower rate after approximately 15 seconds, indicating the BCM has set the VTSS.

SYSTEM DISARMING

The operator can disarm the system by unlocking a front door or the liftgate with the key or the RKE transmitter. The BCM monitors the lock cylinder switch in each front door and the liftgate lock cylinder switches on circuit G71.

HORNS

When the BCM activates the horns, it energizes the horn relay by providing a ground path for the relay coil on circuit X4. Circuit F31 from fuse 6 in the Power Distribution Center (PDC) powers the coil and contact sides of the relay.

When the horn relay energize, its contact close and connect circuit F31 to circuit X2. Circuit X2 feeds the horns. Circuit Z1 provides ground for the horns.

PARKING LAMPS

The BCM operates the park lamps when it senses unauthorized entry to the vehicle while the Vehicle Theft Security System is armed. When it senses unauthorized entry, the BCM energizes the park lamp relay by providing ground for the relay coil on circuit L79. Circuit 366 powers the relay coil and contacts. When the relay energizes, it connects circuit 366 to circuit L90. Circuit L90 powers the park lamps, side marker lamps and tail lamps.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-40 INSTRUMENT CLUSTER

INDEX

DESCRIPTION AND OPERATION

ABS WARNING LAMP . . . . . . . . . . . . . . . . . . . . . 1 ENGINE COOLANT TEMPERATURE GAUGE . . . . 1 FUEL GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HIGH BEAM INDICATOR LAMP . . . . . . . . . . . . . . 2 ILLUMINATION LAMPS . . . . . . . . . . . . . . . . . . . . 2 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . . . 2

DESCRIPTION AND OPERATION

INTRODUCTION

The electronic instrument cluster contains a microprocessor which controls cluster functions based on data it receives from the CCD bus. Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F75 through fuse 7 in the junction block. Circuit F75 powers the cluster micro-processor plus the warning lamps (except the ABS warning lamp) and the high beam indicator lamp. The cluster microprocessor switches the warning lamps and high beam indicator lamps on and off by controlling a transistor in the ground path for each lamp.

WARNING LAMPS—EXCEPT ABS

Circuit F75 feeds all the warning lamps in the instrument cluster except the ABS waring lamp. The micro-processor in the cluster controls each lamp (except the ABS lamp) through a transistor in the ground path of each lamp. The cluster micro-processor turns the warning lamps ON and OFF based on inputs received on the CCD bus. Circuits Z1 and Z2 provide ground for the lamps and micro-processor.

SPEEDOMETER

The micro-processor in the instrument cluster calculates the position of the speedometer needle based on the vehicle speed signal broadcast on the CCD bus by the Powertrain Control Module. The PCM determines vehicle speed from the input provided by the vehicle speed sensor.

TACHOMETER

The Powertrain Control Module (PCM) transmits the engine RPM data on the CCD bus. From the bus, the instrument cluster calculates tachometer needle position based on the engine RPM signal.

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SPEEDOMETER . . . . . . . . . . . . . . . . . . . . . . . . . 1 TACHOMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 TURN SIGNAL INDICATOR LAMPS . . . . . . . . . . . 2 VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 WARNING LAMPS—EXCEPT ABS . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

VOLTMETER

The Powertrain Control Module (PCM) broadcasts system voltage data on the CCD bus. The micro-processor in the instrument cluster calculate voltmeter needle position base on the signal received from the CCD bus.

FUEL GAUGE

The Powertrain Control Module (PCM) transmits the fuel percentage data over the CCD bus. The micro-processor in the instrument cluster calculates position of the fuel gauge needle based on the signal from the PCM.

ENGINE COOLANT TEMPERATURE GAUGE

The Powertrain Control Module (PCM) broadcasts the engine coolant temperature data over the CCD bus. From the data signal on the CCD bus, the instrument cluster micro-processor calculates coolant temperature gauge needle position.

ABS WARNING LAMP

Circuit F87 from fuse 5 in the junction block provides power for the ABS warning lamp in the instrument cluster. Ground for the ABS warning lamp is provided by either the Controller, Anti-Lock Brakes (CAB) or by the ABS main relay when the relay is not energized. The CAB illuminates the lamp by providing ground on circuit B205.

Circuit B205 splices to connect to circuit B47 through a diode. When the ABS main relay is not energized, it connects circuit B47 to ground on circuit Z4. The ground path for the warning lamp is through the diode to circuit B47, through the ABS main relay to ground on circuit Z4.

The diode between circuit B205 and B47 prevents voltage from flowing to the CAB when the ABS main relay switches to supply power on circuit B47.

HELPFUL INFORMATION

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 powers circuit F87 through fuse 5 in the junction block.

OIL PRESSURE GAUGE

The instrument cluster micro-processor calculates engine oil pressure gauge needle position based on the oil pressure data received over the CCD bus. The Powertrain Control Module (PCM) transmits the data over the CCD bus.

HIGH BEAM INDICATOR LAMP

The micro-processor in the instrument cluster switches the high beam indicator lamp ON and OFF through a transistor in lamps ground circuit. The Body Control Module (BCM) signals the instrument cluster micro-processor over the CCD bus to turn the high beam indicator ON or OFF. Circuit F75 powers the lamp.

TURN SIGNAL INDICATOR LAMPS

Circuits L65 and L64 from the turn signal/hazard flasher circuitry in the multi-function switch power the turn signal indicator lamps. Circuit L64 powers the right turn signal indicator lamp. Circuit L65 powers the left indicator lamp. Circuits Z1 and Z2 provide ground for the lamps.

ILLUMINATION LAMPS

Circuit E2 from the headlamp switch powers the illumination lamps in the instrument cluster. Circuits Z1 and Z2 provide ground for the lamps.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-41 HORN/CIGAR LIGHTER

DESCRIPTION AND OPERATION

HORN

The horn system is powered by circuit F31 from fuse 6 in the Power Distribution Center (PDC). Circuit F31 supplies voltage to the coil and contact sides of the horn relay in the PDC.

When the operator presses the horn switch, a ground path is completed on the coil side of the horn relay through the case grounded switch, on circuit X4. The horn relay contacts then closes to connect circuit F31 to circuit X2. Circuit X2 powers the horns. Circuit Z1 provides ground for the horns.

On vehicles equipped with Vehicle Theft Security System (VTSS), the X4 circuit is spliced to the Body Control Module (BCM). For operation of the VTSS, refer to section 8W-39.

CIGAR LIGHTER

The cigar lighter relay powers the cigar lighter. The relay energizes when the ignition switch is in the ACCESSORY or RUN position. In the ACCES- SORY or RUN position, the switch connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A31. Circuit A31 powers relay coil. Circuit Z1 provides ground for the relay coil.

When the relay energizes, its connects circuit F61 from fuse 10 in the PDC to circuit F30. Circuit F30 powers the cigar lighter.

When the operator depresses the lighter, contacts inside the lighter element close, and voltage from circuit F30 flows through the heating element to ground. Circuit Z1 provides ground for the lighter.

HELPFUL INFORMATION

Circuit Z1 also grounds the power outlet.

POWER OUTLET

Circuit A7 from 15 in the Power Distribution Center (PDC) powers circuit F38 through fuse 21 in the junction block. Circuit F38 feeds the power outlet. Circuits A7 and F38 are HOT at all times. Circuit Z1 provides ground for the power outlet.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-42 AIR CONDITIONING/HEATER

INDEX

GENERAL INFORMATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 DESCRIPTION AND OPERATION

A/C OPERATION—AUTOMATIC TEMPERATURE

CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A/C OPERATION—MANUAL A/C . . . . . . . . . . . . . 2 AMBIENT TEMPERATURE SENSOR . . . . . . . . . . 2 AUTOMATIC TEMPERATURE CONTROL (ATC)

MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 AUTOMATIC TEMPERATURE CONTROL (ATC) . . 2 BLEND AIR DOOR MOTOR ACTUATOR—

MANUAL A/C-HEATER . . . . . . . . . . . . . . . . . . . 2 BLEND DOOR MOTOR—AUTOMATIC

GENERAL INFORMATION

INTRODUCTION

This section of the wiring diagrams is divided into two sub-sections; Manual A/C-Heater, and Automatic Temperature Control (ATC). When referring to the circuit descriptions or wiring diagrams, ensure that you use the correct one.

DESCRIPTION AND OPERATION

MANUAL A/C-HEATER

Several fuses supply power for the manual air conditioning/heater system. When the ignition switch is in the RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F71 through fuse 12 in the junction block. Circuit F71 connects to the A/C control switches and the blend air door motor.

When the ignition switch is in the START or RUN position, it connects circuit A1 to circuit A21. Circuit A21 powers circuit F99 through fuse 18 in the PDC. Circuit F99 powers the coil side of the A/C compressor clutch relay.

Circuit A900 from fuse 3 in the PDC powers circuit F250 through fuse 21 in the PDC. Circuit F250 powers the contact side of the A/C compressor clutch relay.

Circuit E2 from the headlamp dimmer switch powers the case grounded illumination lamp in the A/C- heater control switch.

page page

TEMPERATURE CONTROL . . . . . . . . . . . . . . . . 3 BLOWER MOTOR—AUTOMATIC

TEMPERATURE CONTROL . . . . . . . . . . . . . . . . 3 BLOWER MOTOR—MANUAL A/C-HEATER . . . . . 1 IN-CAR TEMPERATURE SENSOR . . . . . . . . . . . . 2 MANUAL A/C-HEATER . . . . . . . . . . . . . . . . . . . . . 1 MODE DOOR MOTOR—AUTOMATIC

TEMPERATURE CONTROL . . . . . . . . . . . . . . . . 3 RECIRCULATION DOOR MOTOR—AUTOMATIC

TEMPERATURE CONTROL . . . . . . . . . . . . . . . . 3 SOLAR SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . 2 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 3

BLOWER MOTOR—MANUAL A/C-HEATER

The blower motor switch has four positions; LOW, MEDIUM 1, MEDIUM 2, AND HIGH. Circuit A19 from fuse 7 in the PDC supplies power to the blower motor. Ground for the blower motor is supplied on circuit C7 through the blower motor resistor block to the blower motor switch, through an internal relay in the A/C-Heater Control head. When the internal relay energizes, it connects the blower motor switch to circuit C1. Circuit C1 connects to ground circuit Z4.

In the HIGH position, the blower motor switch connects circuit C7 from the blower motor directly to ground on circuits C1 and Z4. In the LOW or MEDIUM positions, the ground path passes through the blower motor resistor block to the switch. The switch connects the circuit C1.

The blower motor resistor block consists of three resistors connected in series. Depending on blower motor switch position, the ground path on circuit C7 from the blower motor passes through one or more resistors to circuit C1.

When the blower motor switch is in the LOW position, the ground path passes through all three resistors in the blower motor resistor block to circuit C4. The blower motor switch connects circuit C4 to circuits C1 and Z4.

In the MEDIUM 1 position, the ground path passes through two resistors in the resistor block to circuit C5. The blower motor switch connects circuit C5 to circuits C1 and Z4.

In the MEDIUM 2 position, the ground path passes through one resistor in the resistor block to circuit C6. The blower motor switch connects circuit C6 to circuits C1 and Z4.

A/C OPERATION—MANUAL A/C

When the A/C-heater control switch is moved to an A/C position or the defrost position, the Body Control Module (BCM) receives the A/C select signal on circuit C90. After receiving the input, the BCM signals the Powertrain Control Module (PCM) on the CCD bus.

The A/C low pressure and high pressure switches are wired in series and connect to ground on circuit Z1. Circuit C3 from the PCM connects to the low pressure switch. Circuit C21 connects the low pressure switch to the high pressure switch. The high pressure switch connects circuit C21 to ground circuit Z1. If the A/C low pressure and high pressure switches are closed, the PCM senses the A/C request signal on circuit C3.

After sensing the A/C request signal, the PCM supplies ground for the coil side of A/C compressor clutch relay on circuit C13. Circuit F99 from fuse 18 in the PDC powers the coil side of the relay.

When the PCM grounds the A/C compressor clutch relay, the contacts close and connect circuit F250 from fuse 21 in the PDC to circuit C2. Circuit C2 supplies power to the case grounded A/C compressor clutch.

The A/C compressor clutch has a built-in diode. The diode controls the induced voltage that results from the magnetic field collapsing when the clutch disengages. The diode provides a current path to protect other components and systems.

HELPFUL INFORMATION

Circuit A900 from fuse 3 in the PDC powers circuit F250 through PDC fuse 21.

BLEND AIR DOOR MOTOR ACTUATOR—MANUAL A/C-HEATER

The A/C-Heater control head contains a blend door position sensor. The sensor is a variable resistor that provides the blend door position input to the blend door motor actuator on circuit C36.

Circuit F71 from fuse 12 in the junction block powers the actuator when the ignition switch is in the RUN position. Circuit C34 splices to connect the blend door actuator to ground circuit Z1.

AUTOMATIC TEMPERATURE CONTROL (ATC)

Several fuses supply power for the Automatic Temperature Control (ATC) system. When the ignition switch is in the RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F71 through fuse 12 in the junction block. Circuit F71 connects to the ATC module and the recirculation door motor.

Circuit A7 from fuse 15 in the PDC powers circuit F60 through fuse 20 in the junction block. Circuit F60 supplies power to the ATC module.

When the ignition switch is in the START or RUN position, it connects circuit A1 from PDC fuse 8 to circuit A21. Circuit A21 powers circuit F99 through fuse 18 in the PDC. Circuit F99 powers the coil side of the A/C compressor clutch relay.

Circuit A19 from fuse 7 in the PDC connects to the blower power module and to the coil and contact sides of the high speed blower motor relay.

AUTOMATIC TEMPERATURE CONTROL (ATC) MODULE

Circuit F71 supplies battery voltage to the Automatic Temperature Control (ATC) module when the ignition switch is in the RUN position. Circuit F60 from fuse 20 in the junction block connects to the ATC module. Circuit F60 is HOT at all times. Circuit Z4 provides ground for the ATC module.

Circuit E2 from the headlamp dimmer switch connects to the ATC module.

The ATC module communicates with other vehicle modules and controllers on the CCD bus. Circuits D1 and D2 for the CCD Bus connect to the ATC module.

AMBIENT TEMPERATURE SENSOR

The ambient temperature sensor is a variable resistor. Circuit C8 provides the ambient temperature sensor signal to the ATC module. Circuit D41 provides ground for the sensor. Circuit D41 connects to the ATC module.

IN-CAR TEMPERATURE SENSOR

The in-car temperature sensor is a variable resistor. Circuit C10 provides the in-car temperature sensor signal to the ATC module. Circuit D41 provides ground for the sensor. Circuit D41 connects to the ATC module.

SOLAR SENSOR

The solar sensor is a variable resistor. Circuit C47 from the ATC module connects to the solar sensor. Circuit D41 provides ground for the sensor. Circuit D41 connects to the ATC module.

A/C OPERATION—AUTOMATIC TEMPERATURE CONTROL

When the A/C select switch in the Automatic Temperature Control (ATC) control head closes circuit C90 provides the A/C select signal to the Body Control Module (BCM). After receiving the input, the BCM signals the Powertrain Control Module (PCM) on the CCD bus.

The A/C low pressure and high pressure switches are wired in series and connect to ground on circuit

Z1. Circuit C3 from the PCM connects to the low pressure switch. Circuit C21 connects the low pressure switch to the high pressure switch. The high pressure switch connects circuit C21 to ground circuit Z1. If the A/C low pressure and high pressure switches are closed, the PCM senses the A/C request signal on circuit C3.

After sensing the A/C request signal, the PCM supplies ground for the coil side of A/C compressor clutch relay on circuit C13. Circuit F99 from fuse 18 in the PDC powers the coil side of the relay.

When the PCM grounds the A/C compressor clutch relay, the contacts close and connects circuit F250 from fuse 21 in the PDC to circuit C2. Circuit C2 supplies power to the case grounded A/C compressor clutch.

The A/C compressor clutch has a built-in diode. The diode controls the induced voltage that results from the magnetic field collapsing when the clutch disengages. The diode provides a current path to protect other components and systems.

HELPFUL INFORMATION

Circuit A900 from fuse 3 in the PDC powers circuit F250 through PDC fuse 21.

RECIRCULATION DOOR MOTOR—AUTOMATIC TEMPERATURE CONTROL

When the ignition switch is in the RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F71 through fuse 12 in the junction block. Circuit F71 feeds the recirculation door motor. Circuit F71 also connects to the Automatic Temperature Control (ATC) module.

Circuits C32 and C33 from the ATC module connect to the recirculation door motor. Circuits C32 and C33 provide ground for the motor.

MODE DOOR MOTOR—AUTOMATIC TEMPERATURE CONTROL

Circuit C40 from the Automatic Temperature Control (ATC) module supplies 5 volts to the position switch in the mode door motor. The ATC module receives the sensor signal from the mode door motor on circuit C39. Circuit D41 provides ground for the mode door position sensor. Circuit D41 connects to the ATC module.

The ATC module operates the mode door motor on circuits C37 and C38.

BLEND DOOR MOTOR—AUTOMATIC TEMPERATURE CONTROL

Circuit C40 from the Automatic Temperature Control (ATC) module supplies 5 volts to the position switch in the blend door motor. The ATC module receives the sensor signal from the blend door motor on circuit C36. Circuit D41 provides ground for the mode door position sensor. Circuit D41 connects to the ATC module.

The ATC module operates the mode door motor on circuits C35 and C34.

BLOWER MOTOR—AUTOMATIC TEMPERATURE CONTROL

When the operator selects blower motor HIGH speed operation, the Automatic Temperature Control (ATC) module grounds high speed blower motor relay. For any speed other than HIGH, the blower power module supplies battery voltage for the blower motor.

BLOWER MOTOR POWER MODULE

When the operator selects any blower motor speed other than HIGH, the blower motor power module supplies voltage for the blower motor. Circuit A19 from fuse 7 in the Power Distribution Center (PDC) supplies battery voltage to the blower motor power module.

The voltage level fed to the blower motor depends on the blower speed selected by the operator. Slower speed selections provide lower voltage to the motor. The blower motor power module feeds the blower motor on circuit C42. Circuit Z4 provides ground for the blower motor and the blower motor power module.

Circuit C43 from the power module connects to the ATC module. The ATC module controls feedback on circuit C43.

HIGH SPEED BLOWER MOTOR RELAY

Circuit A19 from fuse 7 in the Power Distribution Center supplies battery voltage to the coil and contacts sides of the high speed blower motor relay. The ATC module provides ground for the coil side of the relay on circuit C41.

When the ATC module grounds the high speed blower motor relay, the relay contacts close and connect circuit A19 to circuit C42. Circuit C42 connects to the blower motor and the ATC module. Circuit Z4 provides ground for the blower motor.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-43 AIRBAG SYSTEM

INDEX

DESCRIPTION AND OPERATION

AIRBAG IMPACT SENSORS . . . . . . . . . . . . . . . . . 1 AIRBAG SQUIB (AIRBAG IGNITER) . . . . . . . . . . . 1 AIRBAG WARNING LAMP . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

This vehicle has a drivers airbag and a passengers airbag. The Airbag Control Module (ACM) operates both. The airbag system has two sensors, located at the left front and right front of the engine compartment.

In the START or RUN position, the ignition switch connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F20 through fuse 22 in the junction block. Circuit F20 connects to the ACM.

When the ignition switch is in the RUN position, it connects circuit A1 to circuit A21. Circuit A21 powers circuit G5 through fuse 4 in the junction block. Circuit G5 connects to the ACM. Circuit Z6 provides ground for the ACM.

Circuit A250 from fuse 11 in the PDC powers circuit F75 through fuse 7 in the junction block. Circuit F75 powers the airbag warning lamp in the instrument cluster.

AIRBAG IMPACT SENSORS

Two airbag impact sensors provide input to the airbag control module (ACM). Each sensor has two circuits that connect to the ACM.

From the left impact sensor, Circuits R47 and R49 connect to the ACM.

From the right impact sensor, Circuits R46 and R48 connect to the ACM.

AIRBAG SQUIB (AIRBAG IGNITER)

Circuits, R43 and R45, connect the ACM to the drivers airbag squib (igniter) after passing through page page

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 1 the clock spring connector. Circuit R43 from cavity 3 of the ACM 4-way connector connects to the squib. Circuit R45 from cavity 4 of the ACM 4-way connector connects to the squib.

Circuits, R42 and R44, connect the ACM to the passenger airbag squib (igniter). Circuit R42 from cavity 1 of the ACM 4-way connector connects to the squib. Circuit R44 from cavity 2 of the ACM 4-way connector connects to the squib.

AIRBAG WARNING LAMP

Circuit F75 from fuse 7 in the junction block feeds the airbag warning lamp. Ground circuit Z1 connects to the warning lamp through a transistor controlled by the microprocessor in the instrument cluster. When the microprocessor receives a signal from Airbag Control Module (ACM) on the CCD bus, it switches the transistor to connect the lamp to ground.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-44 INTERIOR LIGHTING

INDEX

DESCRIPTION AND OPERATION

COURTESY LAMPS, CARGO LAMP, IGNITION

SWITCH KEY-IN HALO LAMP . . . . . . . . . . . . . . 1 DAY/NIGHT MIRROR . . . . . . . . . . . . . . . . . . . . . . 2 GLOVE BOX LAMP . . . . . . . . . . . . . . . . . . . . . . . 2 ILLUMINATION LAMPS . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

The Body Control Module (BCM) controls the courtesy lamps and rear cargo lamps. The reading dome/ reading lamps in the overhead console act as courtesy lamps as well as containing a switch for independent operation.

Circuit 707 from the dimmer switch circuitry in the head lamp switch provides the illumination lamp intensity signal to the BCM. The BCM powers the illumination lamps on circuit E2.

When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 8 in the PDC to circuit A21. Circuit A21 powers circuit F99 through PDC fuse 15. Circuit F99 feeds the BCM.

In the ACCESSORY or RUN position, the ignition switch connects circuit A1 to circuit A31. Circuit A31 powers circuit V23 through fuse 3 in the junction block. Circuit V23 feeds the BCM.

ILLUMINATION LAMPS

When the headlamps or parking lamps are ON, the The Body Control Module (BCM) recieves the park lamp input on circuit L90 and the illumination lamp intensity signal on circuit 707. Circuit 707 from the dimmer switch circuitry in the head lamp switch provides the illumination lamp intensity signal to the BCM.

After calculating the requested illumination lamp intesity, the BCM powers the following illumination lamps on circuit E2:

• Headlamp switch • Floor console • Instrument panel • Ash receiver • Graphic Display or Vehicle Information Center (VIC)

• Cigar lighter • Radio page page

OVERHEAD CONSOLE LAMPS . . . . . . . . . . . . . . 2 UNDERHOOD LAMP . . . . . . . . . . . . . . . . . . . . . . 2 UNIVERSAL GARAGE DOOR OPENER . . . . . . . . 2 VISOR VANITY MIRRORS . . . . . . . . . . . . . . . . . . 2 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

• A/C-Heater control switch Circuit Z1 provides ground for the floor console lamps, instrument panel lamps, ash receiver lamp, graphic display or VIC. Circuit Z4 grounds the automatic temperature control switch lamp. Circuit Z5 grounds the radio lamp. The cigar lighter lamp and A/C-Heater control switch lamp (manual A/C-Heater) are case grounded.

COURTESY LAMPS, CARGO LAMP, IGNITION SWITCH KEY-IN HALO LAMP

When the courtesy lamp switch closes, it connects circuit M11 from the Body Control Module to ground on circuit Z1. In response the to the courtesy lamp signal, the BCM energizes the courtesy lamp relay by grounding the relay coil on circuit M112. When the relay energizes, it connects circuit M2 to ground on circuit Z1. Circuit M2 provides ground for the right and left courtesy lamps, dome/reading lamps, key-in halo lamp and cargo lamp.

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 powers the right and left courtesy lamps, ignition switch key-in halo lamp, and cargo lamp. Circuit M1 also powers the glove box lamp and underhood lamp.

DOOR COURTESY LAMPS

When the BCM receives the courtesy lamp signal, it broadcasts a message on the CCD bus. The message signals the Drivers Door Module (DDM) and Passenger Door Module (PDM). In response, the DDM and PDM power the courtesy lamps in the front doors on circuit M1. Circuit Z1 grounds the courtesy lamps in the front doors.

Circuit F81 from the circuit breaker in cavity 2 of the junction block powers the DDM and PDM. Circuit A250 from fuse 11 in the PDC feeds circuit F81 through the circuit breaker.

LIFTGATE COURTESY LAMP DISABLE SWITCH

When closed, the liftgate disable switch provides signal to the BCM on circuit M4 indicating a request to disable the courtesy lamps. To operate, all the doors must be closed with only the liftgate open. Pushing on the liftgate lens activates the switch. Pushing on the lense a second time deactivates the switch.

After receiving the courtesy lamp disable signal, the BCM turns off the courtesy lamps by de-energizing the courtesy lamp relay.

GLOVE BOX LAMP

Circuit A7 from 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 powers the glove box lamp. The lamp has a switch in series which when closed, connects the lamp to ground on circuit Z1.

UNDERHOOD LAMP

Circuit M1 from fuse 16 in the Power Distribution Center (PDC) feeds the underhood lamp. The lamp contains a mercury switch which connects the lamp to ground on circuit Z1 when the hood is raised.

VISOR VANITY MIRRORS

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 feeds the visor vanity mirror lamps. Each mirror has a switch grounds the lamps in the mirrors to circuit Z1.

OVERHEAD CONSOLE LAMPS

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 feeds the overhead console lamps.

Each overhead console lamp has a switch that connects the lamps to ground on circuit Z1. The lamps are also grounded when the Body Control Module (BCM) energizes the courtesy lamp relay to connect circuit M2 to ground on circuit Z1.

DAY/NIGHT MIRROR

When the ignition switch is in the RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) circuit A22. Circuit A22 powers circuit F83 through fuse 6 in the junction block. Circuit F83 feeds the day/night rear view mirror. Circuit Z1 grounds mirror.

Circuits P112 and P114 connect from the day/night mirror to the drivers outside mirror.

Circuit L10 from the park/neutral switch signals the day/night mirror when the vehicle is in reverse. The mirror turns off when the vehicle is in reverse.

UNIVERSAL GARAGE DOOR OPENER

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 feeds the visor vanity mirrors and the universal garage door opener. The opener is located on the left visor. Circuit Z1 provides ground for the opener.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-45 BODY CONTROL MODULE

INDEX

DESCRIPTION AND OPERATION

A/C SELECT SWITCH . . . . . . . . . . . . . . . . . . . . . 1 AJAR CHIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 AMBIENT TEMPERATURE SENSOR . . . . . . . . . . 1 AUTO HEADLAMPS . . . . . . . . . . . . . . . . . . . . . . . 2 COURTESY LAMP SWITCH . . . . . . . . . . . . . . . . . 1 ENGINE TEMPERATURE CRITICAL CHIME . . . . . 2 IGNITION SWITCH SENSE . . . . . . . . . . . . . . . . . 2 INSTRUMENT PANEL DIMMING . . . . . . . . . . . . . . 2 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

The Body Control Module (BCM) used in this vehicle provides a communication interface with other controllers and modules. The BCM also controls various vehicle functions. Circuit operation of specific systems or components controlled by the BCM are found in wiring diagram section covering the component or system.

This section of the wiring diagrams provides an overview of the functions controlled or supported by the BCM. The BCM provides or supports the following features:

• A/C Select Switch Status • Ambient Temperature • Automatic Funeral Mode • Automatic Headlamp Control • Chime • Courtesy Lamps with Time Out • Door, Hood or Liftgate Ajar Status • Door Lock Inhibit • Electronic Odometer • Electronic Vehicle Information Center • Fog Lamp Control • Headlamp Delay • High Beam Indicator • Illuminated Entry • Instrument Panel Dimming • Intermittent Wiper Control • Liftgate Courtesy Lamp Disable • Mechanical Instrument Cluster • Rear Window Defogger Control • Remote Radio Control • Seat Belt Reminder • Speed Sensitive Intermittent Wipe Control • Vehicle Theft Security System page page

KEY-IN IGNITION CHIME . . . . . . . . . . . . . . . . . . . 2 LIFTGATE COURTESY LAMP DISABLE

SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 LOW FUEL WARNING LAMP ANNOUNCEMENT

CHIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 LOW OIL PRESSURE WARNING CHIME . . . . . . . 2 PARK LAMP SWITCH SENSE . . . . . . . . . . . . . . . 2 SEAT BELT SWITCH . . . . . . . . . . . . . . . . . . . . . . 2 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

The BCM communicates with the following controllers and modules over the CCD bus:

• Automatic Temperature Control (ATC) Module • Compass (Overhead Console) • Driver Door Module (DDM) • Mechanical Instrument Cluster • Memory Seat Module • Passenger Door Module (PDM) • Powertrain Control Module • Vehicle Information Center • Radio Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F75 through fuse 7 in the junction block. Circuit F75 supplies battery voltage to the BCM. Circuits Z1 and Z2 provide ground for the BCM.

A/C SELECT SWITCH

If the vehicle is equipped with Automatic Temperature Control (ATC), the Automatic Temperature Control Module sends the A/C select switch to the Body Control Module (BCM) on circuit C90. If the vehicle has manual A/C, the A/C-heater controll switch sends the A/C select signal to the BCM on circuit C90.

AMBIENT TEMPERATURE SENSOR

The ambient air temperature sensor is a variable resistor. As ambient (outside) temperature varies, the resistance in the sensor changes. Circuit C8 from the Body Control Module (BCM) supplies power to the sensor. Circuit D41 provides the sensor signal to the BCM.

COURTESY LAMP SWITCH

When the courtesy lamp switch inside the headlamp switch closes, it completes a path to ground for circuit M11 from the Body Control Module (BCM).

The BCM energizes the courtesy lamp relay in the junction block to power the courtesy lamps. Refer to section 8W-44.

LIFTGATE COURTESY LAMP DISABLE SWITCH

When the courtesy lamp disable switch closes, it provides battery voltage to the Body Control Module (BCM) on circuit M4.

AUTO HEADLAMPS

When the operator puts the headlamp switch in the AUTO position, the auto headlamp switch closes and connects circuit L24 from the Body Control Module to ground. This signals the BCM to operate the headlamps based on the ultralight sensor input. The BCM powers the ultralight sensor on circuit L110. Circuit L109 provides the signal from the sensor to the BCM.

PARK LAMP SWITCH SENSE

When the operator puts the headlamp switch in the park lamp position, the park lamp switch closes and circuit L90 powers the parking lamps. Circuit L90 also provides an input to the Body Control Module (BCM). The BCM monitors the L90 circuit and circuit 707 from the dimmer switch to determine instrument panel lamp intensity

INSTRUMENT PANEL DIMMING

On circuit 707 from the dimmer switch in the headlamp switch, the Body Control Module (BCM) determines selected intensity for the instrument panel lamps. The BCM also transmits a signal representing required lamp intensity over the CCD bus. After receiving the signal from the CCD bus, all other display modules update their brightness level.

IGNITION SWITCH SENSE

On circuit V23, the Body Control Module (BCM) senses when the ignition switch is in the ACCES- SORY or RUN position. The BCM senses when the ignition switch is in the START or RUN position on circuit F99.

AJAR CHIME

On models equipped with a Vehicle Information Center (VIC), the Body Control Module (BCM) sounds an audible chime when the vehicle is moving if one of the doors, the hood, or liftgate opens. The BCM also signals the VIC over the CCD bus. The VIC then displays which component is ajar.

KEY-IN IGNITION CHIME

When the key is inserted into the ignition switch, the key-in switch closes and connects circuit G26 from the Body Control Module to ground on circuit Z1. When the key-in switch closes, the BCM sounds an audible fast rate chime.

SEAT BELT SWITCH

The seat belt switch closes when the seat belt is not buckled. When closed, the switch connects circuit G10 from the Body Control Module (BCM) to ground on circuit Z1. If the switch is closed while the ignition switch is ON, the BCM sounds an audible warning chime.

LOW OIL PRESSURE WARNING CHIME

When oil pressure drops below a calibrated level, the Body Control Module (BCM) sounds an audible chime to alert the operator. The BCM receives the low oil pressure signal on the CCD bus.

ENGINE TEMPERATURE CRITICAL CHIME

When engine temperature exceeds a pre-determined temperature, the Body Control Module (BCM) sounds an audible chime. The Powertrain Control Module (PCM) broadcasts engine coolant temperature to the BCM on the CCD bus.

LOW FUEL WARNING LAMP ANNOUNCEMENT CHIME

The Body Control Module (BCM) sounds an audible chime when the low fuel warning lamp illuminates.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-46 MESSAGE CENTER

INDEX

GENERAL INFORMATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 DESCRIPTION AND OPERATION

GRAPHIC DISPLAY MODULE . . . . . . . . . . . . . . . . 1

GENERAL INFORMATION

INTRODUCTION

Each four-wheel drive equipped Grand Cherokee is equipped with a four-wheel drive Graphic Display Module (GDM). The GDM is located at the bottom of the instrument panel center stack. The GDM displays transfer case mode selection.

Some vehicle are equipped with an optional Vehicle Information Center (VIC). The VIC has several functions:

• Display current time and date. • Monitor specific vehicle operating systems and alert the drive if a malfunction occurs.

• Display service reminder or indicate distance to service.

• Display 2WD/4WD transfer case modes of operation.

DESCRIPTION AND OPERATION

GRAPHIC DISPLAY MODULE

Several fuses supply power to the Graphic Display Module (GDM). When the ignition switch is in the RUN position it connects circuit A1 from fuse 8 in the PDC to circuit A22. Circuit A22 feeds circuit F83 through fuse 6 in the junction block. Circuit F83 supplies voltage to the GDM.

Circuit A7 from fuse 15 in the PDC powers circuit F60 through fuse 20 in the junction block. Circuits A7 and F60 are HOT at all times. Circuit F60 feeds the GDM. Circuits Z1 and Z2 provide ground for the GDM.

TRANSFER CASE RANGE DISPLAY

When the transfer case is in either 4WD Low, Part Time 4WD, or Full Time it connects circuit G28 from the Graphic Display Module (GDM) to ground on circuit Z1. In response, the GDM illuminates the 4WD display.

When the transfer case switch is in 4WD Low, it connects circuit G28 from the GDM to ground on cirpage page

VEHICLE INFORMATION CENTER . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2 cuit Z1. In addition to illuminating the 4WD display, the GDM also illuminates the LOW display.

When the transfer case switch is in Part Time 4WD position, it connects circuit T107 from the GDM to ground on circuit Z1. In addition to illuminating the 4WD display, the GDM also illuminates the PART TIME display.

When the transfer case switch is in Full Time 4WD position, it connects circuit T106 from the GDM to ground on circuit Z1. In addition to illuminating the 4WD display, the GDM also illuminates the FULL TIME display.

VEHICLE INFORMATION CENTER

Several fuses supply power to the Vehicle Information Center (VIC). When the ignition switch is in the RUN position it connects circuit A1 from fuse 8 in the PDC to circuit A22. Circuit A22 feeds circuit F83 through fuse 6 in the junction block. Circuit F83 supplies voltage to the VIC.

Circuit A7 from fuse 15 in the PDC powers circuit F60 through fuse 20 in the junction block. Circuits A7 and F60 are HOT at all times. Circuit F60 feeds the VIC.

Circuit A6 from fuse 13 in the PDC powers circuit 366 through fuse 17 in the junction block. Circuit 366 connects to the headlamp switch. When the headlamp switch is in the PARK or LOW position, it connects circuit 366 to circuit L90. Circuit L90 connects to the VIC. Circuit E2 from the Body Control Module (BCM) powers the illumination lamps in the VIC.

Circuits Z1 and Z2 provide ground for the VIC.

TRANSFER CASE RANGE DISPLAY

When the transfer case is in either 4WD Low, Part Time 4WD, or Full Time it connects circuit G28 from the Vehicle Information Center (VIC) to ground on circuit Z1. In response, the VIC illuminates the 4WD display.

When the transfer case switch is in 4WD Low, it connects circuit G28 from the VIC to ground on circuit Z1. In addition to illuminating the 4WD display, the VIC also illuminates the LOW display.

When the transfer case switch is in Part Time 4WD position, it connects circuit T107 from the VIC to ground on circuit Z1. In addition to illuminating the 4WD display, the VIC also illuminates the PART TIME display.

When the transfer case switch is in Full Time 4WD position, it connects circuit T106 from the VIC to ground on circuit Z1. In addition to illuminating the 4WD display, the VIC also illuminates the FULL TIME display.

LAMP OUTAGE

Circuit G46 connects from the Lamp Outage Module (LOM) to the Vehicle Information Center (VIC). Circuit G46 supplies the rear lamp out signal to the VIC.

LOW WASHER FLUID WARNING

When the low washer fluid switch closes, it connects circuit G29 from the VIC to ground on circuit Z1. The VIC displays the Low Washer Fluid warning when the switch closes.

LOW ENGINE COOLANT WARNING

When the engine coolant level switch closes, it connects circuit G18 from the VIC to ground on circuit

Z1. The VIC displays the Low Coolant Level warning when the switch closes.

DOOR AJAR AND LIFTGATE AJAR DISPLAYS

Each door and the liftgate have an ajar switch that connects to the Body Control Module (BCM). The BCM senses when the liftgate or a door opens, and sends the a signal to the VIC on the CCD bus. In response, the VIC displays which door is open. The VIC communicates with the BCM over the CCD bus on circuits D1 and D2.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-47 AUDIO SYSTEM

INDEX

GENERAL INFORMATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 DESCRIPTION AND OPERATION

POWER AMPLIFIER AND SPEAKERS . . . . . . . . . 1 POWER ANTENNA—EXPORT ONLY . . . . . . . . . . 2 RADIO ILLUMINATION . . . . . . . . . . . . . . . . . . . . . 1

GENERAL INFORMATION

INTRODUCTION

There are two audio systems offered on this vehicle. The standard system uses four speakers and a standard antenna. The optional system has six speakers, a power amplifier, standard antenna and remote operating switches on the steering wheel.

Both systems are powered by circuit X12 from fuse 1 in the junction block. When the ignition switch is in the ACCESSORY or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A31. Circuit A31 powers circuit X12 through junction block fuse 1.

Circuit Z5 provides ground for both radios. Both radios connect to the CCD bus on circuits D1 and D2.

DESCRIPTION AND OPERATION

RADIO MEMORY

On the standard and optional radios, circuit F60 from fuse 20 in the junction block powers the radio memory. Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers junction block fuse 20 and circuit F60.

RADIO ILLUMINATION

When the parking lamps or the headlamps are ON, circuits E2 and L90 are used to power the radio illumination lamps. Circuit E2 is used for the dimmable lamps. Circuit L90 is the parking lamps feed.

SPEAKERS—STANDARD RADIO

The standard radio uses four speakers. Circuit X53 feeds the speaker in the left front door. Circuit X55 is the return from the speaker to the radio.

Circuit X54 feeds the right front door speaker. Circuit X56 is the return from the speaker to the radio.

From the radio, circuit X51 connects to circuit X52 at the jumper harness for the left rear door speaker.

page page

RADIO MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . 1 RADIO REMOTE SWITCHES . . . . . . . . . . . . . . . . 2 SPEAKERS—STANDARD RADIO . . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2

Circuit X51 and X52 feed the speaker. Circuit X58 from the speaker jumper harness connects to circuit X57. Circuit X57 is the return from the speaker to the radio.

Circuit X52 feeds the right rear door speaker. Circuit X58 is the return from the speaker to the radio. Circuits X52 and X58 continue through the jumper harness to the right rear door speaker.

POWER AMPLIFIER AND SPEAKERS

The power amplifier is used on optional premium systems only. The amplifier is connected between the radio and the speakers.

Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F75 through fuse 7 in the junction block. Circuit F75 feeds the radio amplifier. Circuit Z5 provides ground for the amplifier. Circuit X60 from the radio supplies power to the amplifier.

From the radio, circuits X54 and X56 for the right front speaker and the speaker in the right side of the instrument panel, connect to the power amplifier. Circuit X54 is the feed from the radio to the amplifier. Circuit X82 is the feed from the amplifier to the right instrument panel speaker and right front door speaker. Circuit X80 is the return from the speakers to the amplifier and circuit X56 is the return from the amplifier to the radio. Circuits X80 and X82 from the amplifier connect to circuits X56 and X54 at the jumper harness for the right front door speaker.

For the left front door speaker and the speaker in the left side of the instrument panel, circuits X53 and X55 from the radio connect to the power amplifier. Circuit X53 is the feed from the radio to the amplifier. Circuit X87 is the feed from the amplifier to the left instrument panel speaker and left front door speaker. Circuit X85 is the return from speakers to the amplifier and circuit X55 is the return from the amplifier to the radio. Circuits X87 and X85 from the amplifier connect to circuits X55 and X53 at the jumper harness for the left front door speaker.

Circuit X51, the feed for the left rear door speaker and circuit X57, the return for the speaker, connect from the radio to the power amplifier. At the jumper harness for the left rear door speaker, circuit X93 from the amplifier connects to circuit X52 and circuit X91 connects to circuit X58. Circuits X93 and X52 feed the speaker. The speaker return is on circuit X58 and circuit X91.

Circuit X52, the feed for the right rear door speaker and circuit X58, the return for the speaker, connect from the radio to the power amplifier. At the jumper harness for the right rear door speaker, circuit X94 from the amplifier connects to circuit X52 and circuit X92 connects to circuit X58. Circuits X94 and X52 feed the speaker. The speaker return is on circuits X58 and X92.

RADIO REMOTE SWITCHES

Premium radios have remote volume, seek, and preset switches on the steering wheel. The remote switches connect to the Body Control Module (BCM) on circuit 709 and ground on circuit Z2. Each switch is wired in parallel. A resistor in series between each switch and ground circuit Z2 determines the signal sensed by the BCM on circuit 709.

After sensing a request from the radio remote switches, the BCM signals the radio over the CCD bus to make the requested selection.

POWER ANTENNA—EXPORT ONLY

The power antenna is only used on vehicles built for export markets.

The power antenna relay supplies voltage to the power antenna motor. The relay supplies voltage to the antenna motor to either raise or lower the antenna.

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) feeds the relay switch through fuse 13 in the junction block.

When the radio is OFF, the switch in the power antenna relay is in the DOWN position. In DOWN position, the relay switch powers circuit X14. Circuit X14 supplies voltage to power antenna motor to lower the antenna. The ground path is from the motor to the relay on circuit X16, through the switch in the relay to ground on circuit Z1.

Circuit Z1 also provides ground for the coil side of the power antenna relay. When the radio is turned ON, circuit X60 from the radio supplies power to the coil side of antenna relay and the relay switches to the UP position. In the UP position, the switch powers circuit X16. Circuit X16 supplies voltage to power the antenna motor to raise the antenna. The ground path is from the motor to the relay on circuit X17, through the switch in the relay to ground on circuit Z1.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-48 REAR WINDOW DEFOGGER

DESCRIPTION AND OPERATION

REAR WINDOW DEFOGGER

The Body Control Module (BCM) operates the rear window defogger system through a relay located in the junction block. When the operator presses the rear window defogger switch, the switch connects circuit C80 from the BCM to ground circuit Z1. In response, the BCM grounds the coil side of the rear window defogger relay on circuit C14.

When the BCM grounds the rear window defogger relay coil, the contacts close and connect circuit A900 from fuse 3 in the Power Distribution Center (PDC) to circuit C15. Circuit C15 supplies power to the rear window defogger grid. Circuit A900 also powers the coil side of the relay. Circuit Z1 grounds the rear window defogger grid.

Internal to the junction block, circuit C15 splices to feed circuit C16 through fuse 10. Circuit C16 feeds the Light Emitting Diode (LED) in the rear window defogger switch.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-49 OVERHEAD CONSOLE

DESCRIPTION AND OPERATION

OVERHEAD CONSOLE

When the ignition switch is in the RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F83 through fuse 6 in the junction block. Circuit F83 supplies power to the overhead console.

The Body Control Module (BCM) broadcasts the park lamp signal and instrument panel illumination lamp intensity signal on the CCD bus. The overhead console receives the signals over the CCD bus and calculates display illumination intensity.

The overhead console receives the fuel percentage and distance information on the CCD bus from the Powertrain Control Module (PCM).

The overhead console contains a US/Metric switch. The switch selects which units to show on the display. The overhead console broadcasts the US/Metric selection on the CCD bus.

OVERHEAD CONSOLE LAMPS

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers circuit M1 through fuse 16 in the junction block. Circuit M1 feeds the overhead console lamps.

Each overhead console lamp has a switch that connects the lamps to ground on circuit Z1. The lamps are also grounded when the Body Control Module (BCM) energizes the courtesy lamp relay to connect circuit M2 to ground on circuit Z1.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-50 FRONT LIGHTING

INDEX

DESCRIPTION AND OPERATION

AUTO HEADLAMPS . . . . . . . . . . . . . . . . . . . . . . . 1 DAYTIME RUNNING LAMPS MODULE . . . . . . . . . 2 FOG LAMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 HEADLAMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

The vehicle is equipped with a Body Control Module (BCM). The BCM controls the auto headlamp feature through the auto headlamp relay.

The park lamps operate when the headlamp switch is in the ON or PARK position. Also, if the vehicle is equipped with the Vehicle Theft Security System (VTSS), the BCM powers the park lamps through the park lamp relay if it senses unauthorized vehicle operation.

Circuit A6 from fuse 13 in Power Distribution Center (PDC), powers the headlamp switch through the circuit breaker in the switch.

PARKING LAMPS

Circuit A6 from fuse 13 in the Power Distribution Center (PDC) powers circuit 366 through fuse 17 in the junction block. When the headlamp switch is in the PARK lamp position, it connects circuit 366 to circuit L90. Circuit L90 powers the parking lamps, side marker lamps. Circuit L90 also connects to the Body Control Module (BCM).

The BCM operates the park lamps when it senses unauthorized entry to the vehicle while the Vehicle Theft Security System is armed. When it sense unauthorized entry, the BCM energizes the park lamp relay by providing ground for the relay coil on circuit L79. Circuit 366 powers the relay coil and contacts. When the relay energizes, it connects circuit 366 to circuit L90.

HEADLAMPS

When the headlamp switch is in the LOW position, it connects circuit A6 from fuse 13 in the Power Distribution Center (PDC) to circuit F34. Circuit F34 connects to the dimmer switch portion of the multifunction switch and feeds circuit L4. Circuit L4 powers the low beam of the headlamps.

When the operator selects high beam operation or flash-to-pass with the turn signal stalk of the multifunction switch, circuit L11 from fuse 19 in the juncpage page

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 PARKING LAMPS . . . . . . . . . . . . . . . . . . . . . . . . . 1 SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2 tion block connects to circuit L3. Circuit L3 powers headlamp high beams. Circuit L3 also connects to the Body Control Module (BCM).

If the vehicle was built for sale in the Country of Canada, the Daytime Running Lamps (DRL) module powers the headlamp high beams on circuit L3 when the headlamp switch is off and the ignition switch is in the RUN position.

AUTO HEADLAMPS

The Body Control Module (BCM) operates the Auto Headlamp feature. The BCM monitors outside light intensity through the auto headlamp light sensor. Circuit L109 from the BCM provides 5 volts to the sensor. Circuit L110 from the sensor sends the light intensity signal to the BCM.

In the AUTO position, the headlamp switch provides a signal to the BCM by connecting circuit L24 to ground on circuit Z1. If outside light intensity is low enough when the BCM senses the AUTO headlamp request, it energizes the auto headlamp relay by grounding the relay coil on circuit 714. Circuit A6 from fuse 13 in the Power Distribution Center (PDC) powers the relay coil and contacts.

When the relay energizes, it connects circuit A6 to circuit F34. Circuit F34 powers circuit L4 through the headlamp dimmer switch circuitry in the multifunction switch. Circuit L4 powers the headlamps.

FOG LAMPS

The fog lamps only operate when the headlamp high beams are off and the park lamps are on. The fog lamp switch contains a light emitting diode (LED) that illuminates during fog lamp operation.

When the fog lamp switch closes, it signals the Body Control Module (BCM) on circuit L35. If the park lamps are on and the BCM does not sense headlamp high beam operation on circuit L3, it energizes the fog lamp relay. The BCM energizes the relay by grounding the relay coil on circuit L95. Circuit F62 from fuse 19 in the Power Distribution Center (PDC) powers the relay coil and contacts.

When the fog lamp relay energizes, it connects circuit F62 from fuse 19 in the Power Distribution Center (PDC) to circuit L39. Circuit L39 powers the fog lamps and the fog lamp switch LED. Circuit Z1 provides ground for the lamps and the LED.

DAYTIME RUNNING LAMPS MODULE

Canadian vehicles are equipped with a Daytime Running Lamps (DRL) module. If the headlamp switch is in the OFF position, the DRL module operates the high beams of the headlamps at 50 percent intensity when the ignition is in the RUN position and the park brake is off. Circuit A6 from fuse 13 in Power Distribution Center (PDC) powers the DRL module. Circuit G9 provides the park brake signal to the DRL module.

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the PDC to circuit A22. Circuit A22 supplies power to circuit F83 through fuse 6 in the junction block. Circuit F83 splices to the DRL module.

Circuit L3 powers the high beams of the left and right headlamps. When the headlamp switch is OFF, the DRL module powers the high beams on circuit L3. When the headlamps are ON, the dimmer switch in the multi-function switch powers the low beams on circuit L4.

Circuit L3 feeds the high beams of the headlamps. When the operator flashes the headlamps with the stalk of the multi-function switch, the DRL module senses voltage on circuit L3. When it senses voltage on circuit L3, the DRL module signals the Body Control Module (BCM) on circuit G34. In response, the BCM turns on the high beam indicator lamp in the instrument cluster.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-51 REAR LIGHTING

DESCRIPTION AND OPERATION

TAIL LAMPS, REAR LICENSE PLATE LAMPS AND SIDE MARKER LAMPS

Circuit A6 from fuse 13 in the Power Distribution Center (PDC) feeds circuit 366 through fuse 17 in the junction block. Circuit 366 connects to the headlamp switch.

When the headlamp switch is in the PARK or LOW position, the switch connects circuit 366 to circuit L90. From the headlamp switch, circuit L90 branches to power the front parking lamps and rear license plate lamps. Circuit L90 connects to circuits L21 and L22. Circuits L21 and L22 feed the tail lamps and side marker lamps. If the vehicle is equipped with a lamp outage module, circuit L90 feeds the module and the module powers the rear tail, license plate and side marker lamps.

The Body Control Module (BCM) operates the park lamps when it senses unauthorized entry to the vehicle while the Vehicle Theft Security System is armed. When it sense unauthorized entry, the BCM energizes the park lamp relay by providing ground for the relay coil on circuit L79. Circuit 366 powers the relay coil and contacts. When the relay energizes, it connects circuit 366 to circuit L90.

Circuit Z1 provides a ground for the parking lamps, tail lamps, and rear license plate lamps.

HELPFUL INFORMATION

• If the vehicle is equipped with factory installed trailer tow, circuit L90 connects to the trailer tow harness.

• Check fuse 13 in PDC. • Check fuse 17 in the junction block.

STOP LAMPS AND CHMSL LAMPS

Circuit A250 from fuse 11 in the Power Distribution Center (PDC) supplies voltage to circuit L16 through fuse 9 in the junction block. Circuit L16 connects to the stop lamp switch.

When the operator presses the brake pedal, the stop lamp switch closes and connects circuit L16 to circuit L50. Circuit L50 connects to circuits L73, L74 and L87. Circuit L73 and L74 feed the stop lamps. Circuit L87 powers the Center High Mounted Stop Lamps (CHMSL). Circuit Z1 provides a ground for the stop lamps and CHMSL lamps.

If the vehicle is equipped with a lamp outage module, circuit L50 connects to the module. The lamp outage module powers circuit L73, L74 and L87.

BACK-UP LAMPS

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit F83 through fuse 6 in the junction block

Circuit F83 supplies power to the PARK/NEU- TRAL position switch. When the operator puts the transmission in REVERSE, the switch connects circuit F83 to circuit L10. Circuit L10 feeds the back-up lamps. Circuit Z1 provides ground for the back-up lamps.

HELPFUL INFORMATION

• Check fuse 8 in the PDC and fuse 6 in the junction block.

• Check for continuity across the back-up lamp switch when it is closed.

LAMP OUTAGE MODULE (LOM)

The Lamp Outage Module (LOM) determines if a rear lighting lamp is not operating. When the ignition switch is in the START or RUN position, circuit A1 from fuse 8 in the Power Distribution Center (PDC) connects to circuit A21. Circuit A21 feeds circuit F87 through fuse 5 in the junction block. Circuits F87 feeds the LOM.

Circuit G46 from the LOM connects to the Vehicle Information Center (VIC). When the LOM senses a inoperative lamp, the VIC displays the data to the vehicle operator.

Circuit L90 which feeds the tail lamps and side marker lamps, connects to the LOM. From the LOM, circuit L90 continues to the license plate lamps. Circuits L21 and L22 from the LOM power the tail lamps and side marker lamps.

Circuit L50 from the stop lamp switch connects to the LOM. From the LOM, circuits L73 and L74 power the stop lamps and circuit L87 powers the Center High Mounted Stop Lamps (CHMSL).

Circuit Z1 grounds the LOM.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-52 TURN SIGNALS

DESCRIPTION AND OPERATION

ELECTRONIC FLASHER RELAY

The electronic flasher relay in the junction block supplies battery voltage to the turn signal/hazard switch circuitry in the multi-function switch. When the ignition switch is OFF, the hazard flashers will operate but the turn signals will not.

Circuit A7 from fuse 15 in the Power Distribution Center (PDC) powers the electronic flasher through fuse 13 in the junction block.

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 feeds the flasher relay through fuse 6 in the junction block. Circuit Z1 provides ground for the relay.

Circuit L5 from the flasher relay connects to the multi-function switch to supply power to the turn signal circuits. The multi-function switch connects to the right rear turn signal lamps on circuit L60 and the left rear turn signal lamp on circuit L61. Circuit L64 from the switch feeds the right front turn signal lamp and side marker lamp. Circuit L65 feeds the left front turn signal lamp and side marker lamp.

Circuit L12 from the flasher relay connects to the multi-function switch to supply power to the hazard flasher circuits. The multi-function switch connects to the rear turn signal lamps on circuits L60 and L61 and the front turn signal and side marker lamps on circuits L64 and L65.

TURN SIGNALS

When the operator selects the right turn signal, the multi-function switch connects circuit L5 from the flasher relay to circuits L60 and L64. Circuit L64 feeds the right front turn signal lamp and side marker lamp. Circuit L60 feeds the right rear turn signal lamp. Circuit L64 also splices to power the right turn signal indicator lamp in the instrument cluster.

When the operator selects the left turn signal, the multi-function switch connects circuit L5 from the flasher relay to circuits L61 and L65. Circuit L61 feeds the left rear turn signal lamp and side marker lamp. Circuit L65 feeds the left front turn signal lamp. Circuit L65 also splices to power the left turn signal indicator lamp on the instrument cluster.

Circuit Z1 provides ground for the turn signal lamps.

HAZARD FLASHERS

When the operator selects the hazard flashers, the multi-function switch circuit L12 from the flasher relay circuits L60, L61, L64 and L65.

Circuit L61 feeds the left rear turn signal lamp. Circuit L60 feeds the right rear turn signal lamp. Circuit L65 feeds the left front turn signal lamp, side marker lamp and the instrument cluster indicator lamp. Circuit L64 feeds the right front turn signal lamp, side marker lamp and the instrument cluster indicator lamp.

Circuit Z1 provides ground for the hazard flasher lamps.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-53 WIPERS

DESCRIPTION AND OPERATION

INTERMITTENT WIPER OPERATION

In the RUN position, the ignition switch connects circuit A1 from fuse 8 in the PDC to circuit A31. Circuit A31 powers circuit F86 through the circuit breaker in cavity 1 of the junction block. Circuit F86 supplies power to the intermittent wiper switch.

When the operator selects LOW speed wiper operation, the switch connects circuit F86 to circuit V3. Circuit V3 powers the wiper motor low speed brush.

When the operator selects HIGH speed wiper operation, the switch connects circuit F86 to circuit V4. Circuit V4 powers the wiper motor speed brush.

When the operator selects intermittent wiper operation the wiper switch sends a signals to the Body Control Module (BCM) on circuit V51. The BCM determines the amount of delay selected on circuit V50 from the switch.

After determining the amount of delay selected, the BCM periodically energizes the intermittent wiper relay on circuit V18. Circuit F86 from the circuit breaker in the junction block powers the relay coil and contacts. Circuit F86 is HOT when the ignition switch is in the ACCESSORY or RUN position.

When the intermittent wiper relay energizes it powers circuit V6. Circuit V6 connects to circuit V3 through the intermittent wiper switch. Circuit V3 powers the wiper motor low speed brush. Circuit Z2 provides ground for the brush. When not energized, the relay connects circuit F86 to circuit V66. Circuit V66 connects to the park switch in the intermittent wiper motor and the BCM.

REAR WIPER/WASHER

The rear wiper and washer system uses a switch assembly located in the right switch pod.

When the ignition switch is in the ACCESSORY or RUN position, it connects circuit A1 from fuse 8 in the Power Distribution Center (PDC) to circuit A31. Circuit A31 powers circuit V23 through fuse 3 in the junction block. Circuit V23 supplies power for the rear wiper/wash switch.

Circuit A250 from fuse 11 in the PDC powers circuit F70 through fuse 8 in the junction block. Circuit F70 powers the rear wiper motor and the control module located internal to the motor assembly.

When the operator selects the ON position, power is supplied through the switch to circuit V13. The V13 circuit connects from the switch to the rear wiper control module.

The module processes this signal and supplies power to the wiper motor. Ground for the wiper motor is supplied on circuit Z1.

When the switch is placed in the DELAY position, power is supplied from the switch to the motor control on circuit V24. The module processes this signal and connects the motor to voltage. The amount of DELAY is controlled by the position of the rear wiper switch.

When the WASH switch is activated, power is passed through the switch to circuit V20. This circuit is double crimped at the switch. One branch of the circuit connects to the rear wiper control module. The other branch connects to the rear washer pump motor.

An additional input to the rear wiper control module is supplied on circuit G78. This circuit is connected to the liftgate and liftglass ajar switches. Circuit G78 signals the control when the liftgate or liftglass opens.

When the liftgate is ajar the wiper control module will not allow the rear wiper or washer to operate.

HELPFUL INFORMATION

• Check fuses 8 and 11 in the PDC • Check fuses 3 and 8 in the junction block • Check the operation of the liftgate ajar switch

LOW WASHER FLUID LEVEL SENSOR

When the switch in the low washer fluid sensor closes, it connects circuit G29 from the Vehicle Information Center (VIC) to ground on circuit Z2. The VIC displays the low washer fluid message.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-54 TRAILER TOW

GENERAL INFORMATION

INTRODUCTION

Two trailer tow packages are available; a factory installed package and a package with after-market provisions. This section provides separate wiring diagrams for each.

DESCRIPTION AND OPERATION

TRAILER TOW—FACTORY INSTALLED

The factory installed trailer tow system in this vehicle uses three relays and a circuit breaker along with the trailer tow wiring connector.

Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F70 through fuse 8 in the junction block. Circuit F70 supplies battery voltage for the trailer tow circuit breaker and the contact side of the stop lamp relay

The trailer tow circuit breaker is taped to the trailer tow harness located in the left rear quarter panel.

STOP LAMP RELAY

Power for the coil side of the stop lamp relay is supplied by circuit L50. This circuit connects to the stop lamps. Ground for the coil side is supplied on circuit Z1.

When the operator presses the brake pedal, voltage flows through the coil of the relay to ground causing the contacts in the relay to connect circuits F70 and 95. Circuit 95 connects to the left and right turn signal relays. Voltage flows through the closed contacts in the relays to the trailer tow connector.

RIGHT TURN RELAY

Power for the coil side of the right turn relay is supplied by circuit L60. This circuit connects to the right side turn signal lamps. Ground for the coil side of the relay is supplied on circuit Z1.

When the operator turns the right turn signal ON, power flows through the coil in the relay to ground causing the contacts in the relay to switch from the normally CLOSED position to connect circuits 94 and L60.

Circuit 94 is the feed for the contact side of the relay. Circuit L60 connects from the relay to the trailer tow connector.

Circuit 94 is fed power through the normally CLOSED side of the stop lamp relay by circuit F70. Circuit F70 is HOT at all times and protected by a circuit breaker located in the right rear quarter panel.

LEFT TURN RELAY

Power for the coil side of the left turn relay is supplied by circuit L61. This circuit connects to the left side turn signal lamps. Ground for the coil side of the relay is supplied on circuit Z1.

When the operator turns the left turn signal ON, power flows through the coil in the relay to ground causing the contacts in the relay to switch from the normally CLOSED position to connect circuits 94 and L61.

Circuit 94 is the feed for the contact side of the relay. Circuit L61 connects from the relay to the trailer tow connector.

Circuit 94 is fed power through the normally CLOSED side of the stop lamp relay by circuit F70. Circuit F70 is HOT at all times and protected by a circuit breaker located in the right rear quarter panel.

HELPFUL INFORMATION

• Check fuse 11 in the PDC • Check fuse 8 in the junction block • Check the In-Line circuit breaker • A trailer brake provision is taped to the harness at the lower left of the instrument panel

TRAILER TOW—AFTER-MARKET

The after-market trailer tow connector is located in the left rear quarter panel. The connector contains feed circuit F70 from fuse 8 in the junction block. Circuit L60 from the right turn signals, circuit L90 for parking lamps, and circuit L50 from the stop lamp switch.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.

8W-60 POWER WINDOWS

INDEX

DESCRIPTION AND OPERATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 POWER WINDOWS . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

INTRODUCTION

All four power windows can be controlled by the switches on the Drivers Door Module (DDM). Additionally, the left rear window as well as the right front and right rear windows have separate switches.

The switch pod on the DDM a contains lock out switch. The lock-out feature prevents the windows from being operated by any switch other than the drivers door switch.

Each rear window switch contains an LED. The DDM prevents illumination of the LEDs when the operator selects the window lock-out feature.

POWER WINDOWS

Circuit A250 from fuse 11 in the Power Distribution Center (PDC) powers circuit F81 through the circuit breaker in cavity 2 of the junction block. Circuit F81 supplies power to the Drivers Door Module (DDM) and the Passengers Door Module (PDM). The DDM and PDM operate the power windows. Circuit Z1 provides ground for the power window system.

LEFT FRONT WINDOW OPERATION

The Drivers Door Module operates the left front window. When the operator selects window DOWN operation, the DDM connects circuit F81 to circuit Q21. Circuit Q21 goes from the switch to the power window motor. Ground for the motor is supplied on the Q11 circuit back to the switch. The DDM connects circuit Q11 to ground circuit Z1.

For window UP operation the circuits are reversed. The DDM connects circuit Q11 to circuit F81 and connects circuit Q21 to ground circuit Z1.

RIGHT FRONT WINDOW OPERATION

The Passengers Door Module (PDM) operates the right front window. If the DRIVER operates the passenger window, the Drivers Door Module signals the Passengers Door Module over the CCD Bus.

For window DOWN operation, the PDM connects circuit F81 to circuit Q22. Circuit Q22 goes from the power window switch circuitry in the PDM to the power window motor. Ground for the motor is suppage page

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX . . . . . . . . . . . . . . . . . . 2 plied on circuit Q12 back to the switch. The DDM connects circuit Q12 to ground circuit Z1.

For window UP operation the circuits are reversed. The PDM connects circuit Q12 to circuit F81 and connects circuit Q22 to ground circuit Z1.

LEFT REAR WINDOW

Circuits Q17 and Q27 connect the Driver’s Door Module (DDM) to the left rear window switch. When the operator has not selected the window lock-out feature, the DDM connects circuits Q17 and Q27 to battery voltage. At the left door harness, circuit Q17 connects to circuit Q18 and circuit Q27 connects to circuit Q28. Circuits Q18 and Q28 connect to the left rear power window switch.

If the window is operated from left rear switch for window DOWN operation, the switch connects circuit Q12 from the power window motor to ground on circuit Z1. The left rear window switch connects circuit Q28 to circuit Q22. Circuit Q22 powers the window motor. Circuits Q12 and Z1 provide ground.

For window UP operation the circuits are reversed. The left rear window switch connects Q22 to ground on circuit Z1. Circuit Q18 powers the rear window motor. Circuits Q22 and Z1 provide ground.

The left rear window switch contains a Light Emitting Diode (LED). The DDM illuminates the LED on circuit E21. Circuit E21 connects to circuit E20 at the left door harness. Circuit E20 connects to the left rear window switch and powers the LED.

If the operator has selected the window lock-out feature, the DDM will not supply power to the left rear window switch on circuits Q27 and Q17. Also, the DDM does not illuminate the LED in the switch.

If the window is operated from DRIVER’S switch for window DOWN operation, the DDM powers circuit Q27 and grounds circuit Q17. Circuit Q27 connects to circuit Q28 at the left rear door harness. From circuit Q28, current passes through the closed contacts in the left rear window switch to circuit Q22. Circuit Q22 powers the window motor. The ground path for the motor is on circuit Q12 from the motor, through the closed contacts in the left rear window switch to circuit Q18, to Q17 back to the DDM.

For window UP operation the circuits are reversed. The DDM powers circuit Q17 and grounds circuit Q27.

RIGHT REAR WINDOW

Circuits Q18 and Q28 connect the Passenger’s Door Module (PDM) to the right rear window switch. When the operator has not selected the window lockout feature, the PDM connects circuits Q18 and Q28 to battery voltage.

If the window is operated from right rear switch for window DOWN operation, the switch connects circuit Q12 from the power window motor to ground on circuit Z1. The right rear window switch connects circuit Q28 to circuit Q22. Circuit Q22 powers the window motor. Circuits Q12 and Z1 provide ground.

For window UP operation the circuits are reversed. The right rear window switch connects Q22 to ground on circuit Z1. Circuit Q18 from the PDM powers circuit Q12 through the closed contacts in the right rear window switch. Circuit Q12 powers the window motor. Circuits Q22 and Z1 provide ground.

The right rear window switch contains a Light Emitting Diode (LED). The PDM illuminates the LED on circuit E20.

If the operator has selected the window lock-out feature, the Driver’s Door Module signals the PDM on the CCD bus. In response, the PDM will not supply power to the right rear window switch on circuits Q18 and Q28. Also, the PDM does not illuminate the LED in the switch.

If the window is operated from DRIVER’S switch for window DOWN operation, the DDM signals the PDM over the CCD Bus. In response, the PDM powers circuit Q28 and grounds circuit Q18. From circuit Q28, current passes through the closed contacts in the right rear window switch to circuit Q22. Circuit Q22 powers the window motor. The ground path for the motor is on circuit Q12 from the motor, through the closed contacts in the right rear window switch to the PDM on circuit Q18.

For window UP operation the circuits are reversed. After the DDM signals the PDM on the CCD Bus, the PDM powers circuit Q18 and grounds circuit Q28.

SCHEMATICS AND DIAGRAMS

WIRING DIAGRAM INDEX

The following index covers all components found in this section of the wiring diagrams. If the component you are looking for is not found here, refer to section 8W-02 for a complete list of all components shown in the wiring diagrams.