B1670

B1670-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGH





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
With the Trailer Tow Lamps activated.

- Set Condition:
When the Front Control Module (FCM) detects a high condition in the right trailer tow lamp relay control circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all Front Control Module (FCM) DTCs.
3. Actuate the Trailer Tow Lamps.
4. With the scan tool read the DTCs.

Does the scan tool read: B1670-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGH?

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. Body Verification Test.

2. TRAILER TOW RELAY
1. Turn the ignition off.
2. Remove and install a known good relay in place of the Right Trailer Tow Relay.

Do the Trailer Tow Lamps operate normally?

Yes

- Replace the Right Trailer Tow Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. FRONT CONTROL MODULE (FCM)




1. Turn the ignition off.
2. Remove the Right Trailer Tow Relay from the PDC.
3. Disconnect the 49 way FCM IPM harness connector.
4. Measure the voltage of the (L656) Right Trailer Tow Relay Output circuit and ground.

Is the voltage above 1.0 volt?

Yes

- Replace the Integrated Power Module (IPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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