B1670

B1670-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical.

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





Diagnostic Test

1. INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all FCM DTC's.
Actuate the Trailer Tow Lamps.
With the Scan Tool read the DTC information.
Does the Scan Tool read: B1670-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- The condition that caused this 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-VER1.Body Verification Test


2. TRAILER TOW RELAY
Turn the ignition off.
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 VER1.Body Verification Test

No

- Go To 3


3. FRONT CONTROL MODULE




Turn the ignition off.
Remove the Right Trailer Tow Relay from the MPD.
Remove the FCM from the Module Power Distribution.
Measure the voltage of the (L656) Right Trailer Tow Relay Output circuit and ground.
Is the voltage above 1.0 volts?

Yes

- Replace the Module Power Distribution center.
- Perform the BODY VERIFICATION TEST-VER1.Body Verification Test

No

- Replace the Module Front Control.
- Perform the BODY VERIFICATION TEST-VER1.Body Verification Test