B1670
B1670-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGHB1670 - Right Trailer Tow Lamp Control Circuit High:
WHEN MONITORED
With the Trailer Tow Lamps activated.
SET MONITORED
When the FCM detects a HIGH condition.
POSSIBLE CAUSES
- Right trailer tow relay
- Module-power distribution
- Front control module
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
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.
Q: 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 - VER 1. 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.
Q: Do the Trailer Tow Lamps operate normally?
YES: Replace the Right Trailer Tow Relay. Perform the BODY VERIFICATION TEST VER1.
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.
Q: Is the voltage above 1.0 volts?
YES: Replace the Module Power Distribution center. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Module Front Control. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test