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B166C-LEFT TRAILER TOW LAMP CONTROL CIRCUIT HIGH (CONTINUED) For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR - For a complete wiring diagram Refer to Section 8W. • When Monitored: • With the Trailer Tow Lamps activated. • Set Condition: • When the FCM detects a LOW condition. Possible Causes LEFT 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. Does the Scan Tool read: B166C-LEFT TRAILER TOW LAMP Yes >> Go To 2 No >> The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermit- Perform the BODY VERIFICATION TEST-VER1. 2. LEFT TRAILER TOW RELAY Turn the ignition off. Remove and install a known good relay in place of the Left Trailer Tow Relay. Do the Trailer Tow Lamps operate normally? Yes >> Replace the Left Trailer Tow Relay in accordance with the service information. Perform the BODY VERIFICATION TEST VER1. No >> Go To 3 8L - 54 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS ND |