B166B

B166B-LEFT TRAILER TOW LAMP CONTROL CIRCUIT LOW





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:
- With the Trailer Tow Lamps activated.
- Set Condition:
- When the FCM detects a LOW condition.





Diagnostic Test

1.INTERMITTENT CONDITION

Turn the ignition on.

With the Scan Tool, clear all FCM DTC's.

Turn the Trailer Tow Lamps on.

With the Scan Tool read the DTC information.

Does the Scan Tool read: B166B-LEFT TRAILER TOW LAMP CONTROL CIRCUIT LOW?

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 the BODY VERIFICATION TEST-VER 1. Body Verification Test

2.(L655) TRAILER TOW CONTROL CIRCUIT





Turn the ignition off.

Disconnect the FCM PDM harness connector.

Measure the resistance between ground and the (L655) Left Trailer Tow Control circuit.

Is the resistance below 5.0 ohms?

Yes

- Replace the Front Control Module (FCM).
- Perform the BODY VERIFICATION TEST VER 1. Body Verification Test

No

- Repair the (L655) Left Trailer Tow Control circuit for a short to ground condition.
- Perform the BODY VERIFICATION TEST VER 1. Body Verification Test