FCM-Left Trailer Relay Output Circuit Open

FCM-LEFT TRAILER RELAY OUTPUT CIRCUIT OPEN

FCM - Left Trailer Relay Output Circuit Open:

WHEN MONITORED
With the ignition on

SET CONDITION
The FCM detects an OPEN condition

POSSIBLE CAUSES
- Integrated power module
- Front control module
- Trailer relay output circuit open

1. INTERMITTENT CONDITION




Turn the ignition on.
With the DRBIII(R), clear all FCM DTC's.
Actuate the Trailer Tow Lamps.
With the DRBIII(R), read the DTC information.

Q: Does the DRBIII(R) read: Left Trailer Relay Output Circuit Open?

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. Body Verification Test

2. INTEGRATED POWER MODULE
Turn the ignition off.
Check the IPM to make certain the Left Trailer Tow Relay is present.

Q: Is the Trailer Tow Relay present?

YES: Go To 3
NO: Replace the Integrated Power Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. FRONT CONTROL MODULE




Turn the ignition off
Measure the voltage of the Fused B+ circuit of the Trailer Tow Relay in the IPM.

Q: Is the voltage above 10 volts?

YES: Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the Trailer Lamp Relay Output Circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test