Symptom:
FCM-LEFT TRAIL RELAY OUTPUT CIRCUIT LOW
POSSIBLE CAUSES
INTERMITTENT CONDITION
FRONT CONTROL MODULE
POWER DISTRIBUTION CENTER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIIIt, read the DTC information.
Does the DRBIIIt read: Left Trailer Relay 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
Remove the FCM from the IPM.
Measure the resistance between ground and the Trailer Tow Relay control 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.
339
EXTERIOR LIGHTING
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