Dodge Lamps 3500 2005, Lamps 2500 2005, Lamps 1500 2005 Service Manual

DR/DH LAMPS 8L - 1

LAMPS

TABLE OF CONTENTS

page page

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL

DIAGNOSTICS ........................... 1

LAMPS/LIGHTING - EXTERIOR - SERVICE

INFORMATION......................... 107

LAMPS/LIGHTING - INTERIOR - ELECTRICAL

DIAGNOSTICS ......................... 174

LAMPS/LIGHTING - INTERIOR - SERVICE

INFORMATION......................... 205

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

TABLE OF CONTENTS

page page

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL

DIAGNOSTICS

DIAGNOSIS AND TESTING

FCM-FRONT FOG LAMP RELAY OUTPUT

CIRCUIT HIGH.........................3

FCM-FRONT FOG LAMP RELAY OUTPUT

CIRCUIT LOW .........................6

FCM-FRONT FOG LAMP RELAY OUTPUT

CIRCUIT OPEN ........................9

FCM-FRONT LEFT TURN OUTPUT CIRCUIT

LOW ...............................12

FCM-FRONT LEFT TURN OUTPUT CIRCUIT

OPEN ..............................15

FCM-FRONT RIGHT TURN OUTPUT

CIRCUIT LOW ........................18

FCM-FRONT RIGHT TURN OUTPUT

CIRCUIT OPEN .......................21

MIC-HEADLAMP SWITCH INPUT CIRCUIT

OPEN ..............................24

MIC-HEADLAMP SWITCH INPUT CIRCUIT

SHORTED ...........................27

FCM-LEFT HIGHBEAM OUTPUT CIRCUIT

LOW ...............................30

FCM-LEFT HIGHBEAM OUTPUT CIRCUIT

OPEN ..............................33

FCM-LEFT LOWBEAM OUTPUT CIRCUIT

LOW ...............................36

FCM-LEFT LOWBEAM OUTPUT CIRCUIT

OPEN ..............................39

FCM-LEFT STOP LAMP OUTPUT CIRCUIT

LOW ...............................42

FCM-LEFT STOP LAMP OUTPUT CIRCUIT

OPEN ..............................45

FCM-LEFT TRAILER RELAY OUTPUT

CIRCUIT HIGH ........................48

FCM-LEFT TRAILER RELAY OUTPUT

CIRCUIT LOW ........................50

FCM-LEFT TRAILER RELAY OUTPUT

CIRCUIT OPEN .......................52

FCM-PARK LAMP RELAY OUTPUT CIRCUIT

HIGH ...............................55

FCM-PARK LAMP RELAY OUTPUT CIRCUIT

LOW ...............................58

FCM-PARK LAMP RELAY OUTPUT CIRCUIT

OPEN ..............................61

FCM-REAR LEFT TURN OUTPUT CIRCUIT

LOW ...............................64

FCM-REAR LEFT TURN OUTPUT CIRCUIT

OPEN ..............................67

FCM-REAR RIGHT TURN OUTPUT CIRCUIT

LOW ...............................70

FCM-REAR RIGHT TURN OUTPUT CIRCUIT

OPEN ..............................73

FCM-RIGHT HIGHBEAM OUTPUT CIRCUIT

LOW ...............................76

FCM-RIGHT HIGHBEAM OUTPUT CIRCUIT

OPEN ..............................79

FCM-RIGHT LOWBEAM OUTPUT CIRCUIT

LOW ...............................82

FCM-RIGHT LOWBEAM OUTPUT CIRCUIT

OPEN ..............................85

FCM-RIGHT STOP LAMP OUTPUT CIRCUIT

LOW ...............................88

FCM-RIGHT STOP LAMP OUTPUT CIRCUIT

OPEN ..............................91

FCM-RIGHT TRAILER RELAY OUTPUT

CIRCUIT HIGH ........................94

8L - 2 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-RIGHT TRAILER RELAY OUTPUT

CIRCUIT LOW ........................96

FCM-RIGHT TRAILER RELAY OUTPUT

CIRCUIT OPEN .......................98

MIC-TURN HAZARD SWITCH INPUT

CIRCUIT OPEN ......................101

MIC-TURN HAZARD SWITCH INPUT

CIRCUIT SHORTED ...................104

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DIAGNOSIS AND TESTING

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 3

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT HIGH

8L - 4 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT HIGH (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects a HIGH condition

Possible Causes

FOG LAMP RELAY INTEGRATED POWER MODULE FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Fog Lamps on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Fog Lamp Relay Output Circuit High?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced,pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 5

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT HIGH (CONTINUED)

FOG LAMP RELAY

Turn the ignition off. Remove and install a known good relay in place of the Fog Lamp

Relay.

Do the Fog Lamps operate normally?

Yes >>

No >>

FRONT CONTROL MODULE

Turn the ignition off. Remove the Fog Lamp Relay from the IPM. Remove the Front Control Module from the IPM. Measure the voltage of the Fog Lamp Relay Control circuit and ground.

Is the voltage above 1.0 volts?

Yes >>

No >>

Replace the Fog Lamp Relay. Perform BODY VERIFICATION TEST - VER 1.

Go To 3

Replace the Integrated Power Module. Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

8L - 6 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT LOW

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 7

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT LOW (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects a short to ground condition

Possible Causes

FOG LAMP RELAY POWER DISTRIBUTION CENTER FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Front Fog Lamps on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Fog Lamp Relay Output Circuit Low?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

8L - 8 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT LOW (CONTINUED)

FOG LAMP RELAY

Turn the ignition off. Install a know good relay in place of the Fog Lamp Relay. Turn the ignition on. Actuate the Fog Lamps.

Do the Fog Lamps operate normally?

Yes >> No >>

FRONT CONTROL MODULE

Turn the ignition off Remove the Fog Lamp Relay. Remove the FCM from the IPM. Measure the resistance between ground and the Fog Lamp Relay control circuit in the IPM.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Go To 3 Replace the Fog Lamp Relay.

Perform BODY VERIFICATION TEST - VER 1.

Replace the Power Distribution Center(PDC). Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 9

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT OPEN

8L - 10 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT OPEN (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects an OPEN condition

Possible Causes

MISSING RELAY FOG LAMP RELAY OUTPUT CIRCUIT OPEN FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Front Fog Lamps on. With the DRBIIIT, read the DTC information.

Doe the DRBIIIT read: Front Fog Lamp Relay Output Circuit Open.

Yes >> No >>

MISSING RELAY

Turn the ignition off. Check the IPM to make certain the Fog Lamp Relay is present.

Is the Fog Lamp Relay present?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

Go To 3 Replace the missing Fog Lamp Relay.

Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 11

FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT OPEN (CONTINUED)

FOG LAMP RELAY

Turn the ignition off. Install a known good relay in place of the fog lamp relay. Turn the Fog Lamps On.

Do the Fog Lamps operate normally?

Yes >>

No >>

FRONT CONTROL MODULE

Turn the ignition off Remove the Fog Lamp Relay. Measure the voltage of the Fused B+ circuit of the fog lamp relay.

Is the voltage above 10 volts?

Yes >>

No >>

Replace the Fog Lamp Relay. Perform BODY VERIFICATION TEST - VER 1.

Go To 4

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

Repair the Fog Lamp Relay Output Circuit. Perform BODY VERIFICATION TEST - VER 1.

8L - 12 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT LEFT TURN OUTPUT CIRCUIT LOW

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 13

FCM-FRONT LEFT TURN OUTPUT CIRCUIT LOW (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects a short to ground condition

Possible Causes

LEFT FRONT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND POWER DISTRIBUTION CENTER FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Left Front Turn Signal on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Left Turn Output Circuit Low?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

8L - 14 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT LEFT TURN OUTPUT CIRCUIT LOW (CONTINUED)

LEFT FRONT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND

Turn the ignition off. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the Left Front Turn Lamp

Driver circuit.

Is the resistance below 5.0 ohms?

Yes >> No >>

FRONT CONTROL MODULE

Turn the ignition off Disconnect the FCM connector. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the Left Front Turn Lamp Driver circuit in the IPM.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Go To 3 Repair the Left Front Turn Lamp Driver circuit for a short

to ground. Perform BODY VERIFICATION TEST - VER 1.

Replace the Power Distribution Center(PDC). Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 15

FCM-FRONT LEFT TURN OUTPUT CIRCUIT OPEN

8L - 16 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT LEFT TURN OUTPUT CIRCUIT OPEN (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects an OPEN condition

Possible Causes

LEFT FRONT TURN SIGNAL OUTPUT CIRCUIT OPEN POWER DISTRIBUTION CENTER FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Left Front Turn Signal on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Left Turn Output Circuit Open?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 17

FCM-FRONT LEFT TURN OUTPUT CIRCUIT OPEN (CONTINUED)

LEFT FRONT TURN SIGNAL OUTPUT CIRCUIT OPEN

Turn the ignition off. Disconnect the IPM C3 harness connector Measure the resistance of the Left Front Turn Signal Output circuit.

Is the resistance above 5.0 ohms?

Yes >>

No >>

FRONT CONTROL MODULE

Turn the ignition off Disconnect the FCM harness connector. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the Left Front Turn Signal Output circuit.

Is the resistance above 5.0 ohms?

Yes >>

No >>

Repair the Left Front Turn Signal Output circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. Go To 3

Replace the Power Distribution Center.. Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

8L - 18 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT LOW

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 19

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT LOW (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects a short to ground condition

Possible Causes

RIGHT FRONT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND POWER DISTRIBUTION CENTER FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Right Front Turn Signal on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Right Turn Output Circuit Low?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

8L - 20 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT LOW (CONTINUED)

RIGHT FRONT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND

Turn the ignition off. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the Right Front Turn

Lamp Driver circuit.

Is the resistance below 5.0 ohms?

Yes >> No >>

FRONT CONTROL MODULE

Turn the ignition off Disconnect the FCM connector. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the Right Front Turn Lamp Driver circuit in the IPM.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Go To 3 Repair the Right Front Turn Lamp Driver circuit for a short

to ground. Perform BODY VERIFICATION TEST - VER 1.

Replace the Power Distribution Center(PDC). Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 21

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT OPEN

8L - 22 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT OPEN (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The FCM detects an OPEN condition

Possible Causes

RIGHT FRONT TURN SIGNAL OUTPUT CIRCUIT OPEN POWER DISTRIBUTION CENTER FRONT CONTROL MODULE

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all FCM DTC’s. Turn the Right Front Turn Signal on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Front Right Turn Output Circuit Open?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 23

FCM-FRONT RIGHT TURN OUTPUT CIRCUIT OPEN (CONTINUED)

RIGHT FRONT TURN SIGNAL OUTPUT CIRCUIT OPEN

Turn the ignition off. Disconnect the IPM C3 harness connector Measure the resistance of the Right Front Turn Signal Output circuit.

Is the resistance above 5.0 ohms?

Yes >>

No >>

FRONT CONTROL MODULE

Turn the ignition off Disconnect the FCM from the IPM. Disconnect the IPM C3 harness connector. Measure the resistance of the Right Front Turn Signal Output circuit.

Is the resistance above 5.0 ohms?

Yes >>

No >>

Repair the Right Front Turn Signal Output circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. Go To 3

Replace the Power Distribution Center.. Perform BODY VERIFICATION TEST - VER 1.

Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1.

8L - 24 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 25

MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The CCN detects an open condition

Possible Causes

HEADLAMP SWITCH HEADLAMP SWITCH MUX CIRCUIT OPEN HEADLAMP SWITCH SENSE CIRCUIT OPEN INSTRUMENT CLUSTER

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all MIC DTC’s. Turn the Headlamps on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Headlamp Switch Input Circuit Open?

Yes >> No >>

HEADLAMP SWITCH

Disconnect the Headlamp Switch connector. Turn the ignition on. Connect a jumper between the Headlamp Switch MUX and Sense circuit of the multifunction switch. With the DRBIIIT, read the headlamp switch voltage.

Does the DRBIIIT display 0.0 volts?

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

Yes >>

No >>

Replace the Headlamp Switch. Perform BODY VERIFICATION TEST - VER 1.

Go To 3

8L - 26 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN (CONTINUED)

HEADLAMP SWITCH MUX CIRCUIT OPEN

Turn the ignition off. Disconnect the left side multifunction switch connector. Disconnect the instrument cluster C2 connector. Measure the resistance of the Headlamp Switch MUX circuit.

Is the resistance below 5.0 ohms?

Yes >> No >>

INSTRUMENT CLUSTER

Turn the ignition off Disconnect the left side Multifunction Switch connector. Disconnect the Instrument Cluster C2 connector. Measure the resistance of the Headlamp Switch Sense circuit.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Go To 4 Repair the Headlamp Switch MUX circuit for an open con-

dition. Perform BODY VERIFICATION TEST - VER 1.

Replace the Instrument Cluster. Perform BODY VERIFICATION TEST - VER 1.

Repair the Headlamp Switch Sense circuit for an open condition.

Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 27

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED

8L - 28 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED (CONTINUED)

For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

With the ignition on

• Set Condition:

The CCN detects a short to ground condition

Possible Causes

HEADLAMP SWITCH HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND INSTRUMENT CLUSTER

INTERMITTENT CONDITION

Turn the ignition on. With the DRBIIIT, clear all MIC DTC’s. Turn the Headlamps on. With the DRBIIIT, read the DTC information.

Does the DRBIIIT read: Headlamp Switch Input Circuit Short?

Yes >> No >>

HEADLAMP SWITCH

Disconnect the Headlamp Switch connector. Turn the ignition on.

Does the DRBIIIT display Headlamp Switch 5.0 volts?

Yes >> No >>

Go To 2 The condition that caused the symptom is

currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.

Perform BODY VERIFICATION TEST VER 1.

Go To 3 Replace the Headlamp Switch.

Perform BODY VERIFICATION TEST - VER 1.

DR/DH LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS 8L - 29

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED (CONTINUED)

HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND

Turn the ignition off. Disconnect the Headlamp Switch connector. Disconnect the instrument cluster C3 connector. Measure the resistance of the Headlamp Switch MUX circuit to

ground.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Repair the Headlamp Switch MUX circuit for a short to ground condition.

Perform BODY VERIFICATION TEST - VER 1. Replace the Instrument Cluster.

Perform BODY VERIFICATION TEST - VER 1.

8L - 30 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS DR/DH

FCM-LEFT HIGHBEAM OUTPUT CIRCUIT LOW

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