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B1659-FRONT FOG LAMP CONTROL CIRCUIT LOW (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 Fog Lamps activated. • Set Condition: • When the FCM detects a LOW condition. Possible Causes (L139) FOG LAMP CONTROL CIRCUIT 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. Turn the Fog Lamps on. With the Scan Tool read the DTC information. Does the Scan Tool read: B1659-FRONT FOG LAMP CONTROL 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. (L139) FOG LAMP CONTROL CIRCUIT Turn the ignition off. Disconnect the FCM PDM harness connector. Measure the resistance between ground and the (L139) Fog Lamp Is the resistance below 5.0 ohms? Yes >> Replace the Front Control Module (FCM) in accordance with the service information. Perform the BODY VERIFICATION TEST VER1. No >> Repair the (L139) Fog Lamp Control circuit for a short to ground condition. Perform the BODY VERIFICATION TEST VER1. 8L - 42 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS ND |