Page 505 of 4284

Symptom:
LEFT REAR TURN SIGNAL OUTPUT SHORT
When Monitored and Set Condition:
LEFT REAR TURN SIGNAL OUTPUT SHORT
When Monitored: Anytime the BCM is active.
Set Condition: When output voltage status is Low.
POSSIBLE CAUSES
INTERMITTENT CONDITION
LEFT REAR TURN SIGNAL DRIVER CIRCUIT SHORT TO GROUND
TURN SIGNAL LAMP
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all BCM DTC's.
Actuate the Turn Signals.
With the DRBIIIt, read the DTC information.
Does the DRBIIItread: Left Rear Turn Signal Output Short?All
Ye s®Go To 2
No®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.
2 Turn the ignition off.
Disconnect the Left Rear Turn Signal Lamp connector.
Disconnect the BCM harness connector.
Measure the resistance between the Left Rear Turn Signal Driver circuit and ground.
Is the resistance below 100.0 ohms?All
Ye s®Repair the Left Rear Turn Signal Driver circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 3
476
EXTERIOR LIGHTING
Page 506 of 4284
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Left Rear Turn Signal Lamp connector.
Turn the ignition on.
Turn the Left Turn Signal on.
Using a 12-volt test light connected to ground, check the Left Rear Turn Signal
Driver circuit.
Does the test light illuminate brightly?All
Ye s®Replace the Turn Signal Lamp.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
477
EXTERIOR LIGHTING
LEFT REAR TURN SIGNAL OUTPUT SHORT ÐContinued
Page 507 of 4284

Symptom:
LEFT SIDE PARK LAMP OPEN
When Monitored and Set Condition:
LEFT SIDE PARK LAMP OPEN
When Monitored: Anytime the FCM is active.
Set Condition: When B+ voltage is below 10.0 volts.
POSSIBLE CAUSES
INTERMITTENT CONDITION
GROUND CIRCUIT
PARK LAMP
PARK LAMP FUSE #2
PARK LAMP RELAY
PARK LAMP OUTPUT CIRCUIT OPEN
FRONT CONTROL MODULE
INTELLIGENT POWER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all FCM DTC's.
Turn the Park Lamps on.
With the DRBIIIt, read the DTC information.
Does the DRBIIItread: Left Side Park Lamp Fuse Outage?All
Ye s®Go To 2
No®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.
2 Turn the ignition off
Disconnect the left front Park Lamp harness connector.
Using a 12-volt test light connected to 12-volts, check the ground circuit.
Does the test light illuminate brightly?All
Ye s®Go To 3
No®Repair the Ground Circuit.
Perform BODY VERIFICATION TEST - VER 1.
478
EXTERIOR LIGHTING
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TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the left front park lamp connector.
Turn the ignition on.
Turn the Park Lamps on.
Using a 12-volt test light connected to ground, check the Park Lamp Output circuit.
Does the test light illuminate brightly?All
Ye s®Replace the Park Lamp.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
4 Turn the ignition off.
Check the IPM Park Lamp Fuse #2.
Is the Fuse open?All
Ye s®Replace the Park Lamp Fuse #2.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 5
5 Turn the ignition off.
Install a known good relay in place of the Park Lamp Relay.
Turn the Park Lamps on.
Do the Park Lamps operate normally?All
Ye s®Replace the Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 6
6 Turn the ignition off.
Disconnect the IPM harness connector.
Measure the resistance of the Park Lamp Output Circuit to ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Park Lamp Output Circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 7
7 Turn the ignition off.
Remove the Park Lamp Relay.
Measure the voltage of the Fused B+ circuit of the Park Lamp Relay.
Is the voltage above 10.0 volts?All
Ye s®Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Intelligent Power Module.
Perform BODY VERIFICATION TEST - VER 1.
479
EXTERIOR LIGHTING
LEFT SIDE PARK LAMP OPEN ÐContinued
Page 509 of 4284

Symptom:
PARK LAMP OUTPUT 1 OPEN
When Monitored and Set Condition:
PARK LAMP OUTPUT 1 OPEN
When Monitored: Ignition on.
Set Condition: The IPM detects high current from the Park Lamp Relay Control circuit.
POSSIBLE CAUSES
MISSING RELAY
OPEN FUSE
PARK LAMP RELAY
INTERMITTENT CONDITION
RIGHT FRONT FUSED PARK LAMP RELAY OUTPUT CIRCUIT OPEN
FRONT CONTROL MODULE
INTELLIGENT POWER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all IPM DTC's.
Turn the Park Lamps on.
With the DRBIIIt, read the DTC information.
Does the DRBIIItread: Park Lamp Output 1 Open?All
Ye s®Go To 2
No®Go To 6
2 Turn the ignition off.
Check the IPM to make certain the Park Lamp Relay is present.
Is the Park Lamp Relay present?All
Ye s®Go To 3
No®Replace the missing Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Check the IPM Park Lamp fuse #3.
Is the fuse open?All
Ye s®Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
480
EXTERIOR LIGHTING
Page 510 of 4284

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Install a known good relay in place of the park lamp relay.
Turn the Park Lamps On.
Do the Park Lamps operate normally?All
Ye s®Replace the Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 5
5 Turn the ignition off
Remove the Park Lamp Relay.
Measure the voltage of the Fused B+ circuit of the park lamp relay.
Is the voltage above 10 volts?All
Ye s®Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Intelligent Power Module.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the Front Control Module from the IPM.
Remove the Park Lamp Relay.
Measure the resistance of the Park Lamp Relay Control Circuit.
Is the resistance below 5.0 ohms?All
Ye s®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.
No®Repair the Right Front Fused Park Lamp Relay Output circuit for
an open condition.
Perform BODY VERIFICATION TEST - VER 1.
481
EXTERIOR LIGHTING
PARK LAMP OUTPUT 1 OPEN ÐContinued
Page 511 of 4284

Symptom:
PARK LAMP OUTPUT 1 SHORT TO BATTERY
When Monitored and Set Condition:
PARK LAMP OUTPUT 1 SHORT TO BATTERY
When Monitored: Ignition on.
Set Condition: When a battery fault condition is present.
POSSIBLE CAUSES
INTERMITTENT CONDITION
PARK LAMP RELAY
FRONT CONTROL MODULE
INTELLIGENT POWER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all FCM DTC's.
Turn the Park Lamps on.
With the DRBIIIt, read the DTC information.
Does the DRBIIItread: Park Lamp Output 1 Short to BATT?All
Ye s®Go To 2
No®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.
2 Turn the ignition off.
Remove and install a known good relay in place of the Park Lamp Relay.
Do the Park Lamps operate normally?All
Ye s®Replace the Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 3
3 Turn the ignition off.
Remove the Park Lamp Relay from the IPM.
Remove the Front Control Module from the IPM.
Measure the voltage of the Park Lamp Relay Control circuit and ground.
Is the voltage above 1.0 volts?All
Ye s®Replace the Intelligent Power Module.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
482
EXTERIOR LIGHTING
Page 512 of 4284

Symptom:
PARK LAMP OUTPUT 2 OPEN
When Monitored and Set Condition:
PARK LAMP OUTPUT 2 OPEN
When Monitored: Ignition on.
Set Condition: The IPM detects high current from the Park Lamp Relay Control circuit.
POSSIBLE CAUSES
MISSING RELAY
OPEN FUSE
PARK LAMP RELAY
INTERMITTENT CONDITION
LEFT FRONT FUSED PARK LAMP RELAY OUTPUT CIRCUIT OPEN
FRONT CONTROL MODULE
INTELLIGENT POWER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all IPM DTC's.
Turn the Park Lamps on.
With the DRBIIIt, read the DTC information.
Does the DRBIIItread: Park Lamp Output 2 OpenAll
Ye s®Go To 2
No®Go To 6
2 Turn the ignition off.
Check the IPM to make certain the Park Lamp Relay is present.
Is the Park Lamp Relay present?All
Ye s®Go To 3
No®Replace the missing Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Check the IPM Park Lamp fuse #2.
Is the fuse open?All
Ye s®Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 4
483
EXTERIOR LIGHTING