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B1643-REAR LEFT TURN CONTROL CIRCUIT LOW (CONTINUED) For the Exterior Lighting circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR - SCHEMAT- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (L63) REAR LEFT TURN SIGNAL CONTROL CIRCUIT MODULE POWER DISTRIBUTION CENTER 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 Left Turn Signals on. With the Scan Tool read the DTC information. Does the Scan Tool read: B1643-REAR LEFT TURN 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. L63 LEFT TURN SIGNAL CONTROL CIRCUIT Turn the ignition off. Disconnect the FCM PDM connector. Measure the resistance between ground and the (L63) Rear Left Turn Is the resistance below 5.0 ohms? Yes >> Go To 3 No >> Repair the (L63) Rear Left Turn Signal Control circuit for a short to ground. Perform the BODY VERIFICATION TEST-VER1. 8L - 30 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS ND |