Symptom:
FCM-RIGHT TRAIL RELAY OUTPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
INTEGRATED POWER MODULE
FRONT CONTROL MODULE
TRAILER LAMP RELAY OUTPUT CIRCUIT OPEN
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: Right Trailer Relay Output Circuit Open?
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.
Check the IPM to make certain the Right Trailer Tow Relay is present.
Is the Trailer Tow Relay present?
All
Yes → Go To 3
No → Replace the Integrated Power Module.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off
Measure the voltage of the Fused B+ circuit of the Trailer Tow relay in the IPM.
Is the voltage above 10 volts?
All
Yes → Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No → Repair the Trailer Lamp Relay Output Circuit.
Perform BODY VERIFICATION TEST - VER 1.
356
EXTERIOR LIGHTING