Symptom:
FCM-REAR LEFT TURN OUTPUT CIRCUIT LOW
POSSIBLE CAUSES
INTERMITTENT CONDITION
REAR LEFT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND
FRONT CONTROL MODULE
POWER DISTRIBUTION CENTER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all FCM DTC’s.
Actuate the Left Turn signal lamp.
With the DRBIIIt, read the DTC information.
Does the DRBIIIt read: Rear Left Turn Output Circuit Low?
All
Yes → 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 IPM C3 harness connector.
Measure the resistance between ground and the Rear Left Turn Lamp Driver circuit.
Is the resistance below 5.0 ohms?
All
Yes → Go To 3
No → Repair the Rear Left Turn Lamp Driver circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off
Disconnect the FCM connector.
Disconnect the IPM C3 harness connector.
Measure the resistance between ground and the Rear Left Turn Lamp Driver circuit
in the IPM.
Is the resistance below 5.0 ohms?
All
Yes → Replace the Power Distribution Center(PDC).
Perform BODY VERIFICATION TEST - VER 1.
No → Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
344
EXTERIOR LIGHTING
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