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B1607-HEADLAMP SWITCH INPUT 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: • Set Condition: Possible Causes HEADLAMP SWITCH (L900) MUX RETURN CIRCUIT INSTRUMENT CLUSTER Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Diagnostic Test 1. INTERMITTENT CONDITION Turn the ignition on. With the Scan Tool, clear all CCN DTC’s. Turn the Headlamps on. With the Scan Tool, read the DTC information. Does the Scan Tool read: B1607-HEADLAMP SWITCH INPUT 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 — VER 1. 2. HEADLAMP SWITCH Disconnect the Headlamp Switch connector. Turn the ignition on. Measure the voltage of the (L900) MUX Return circuit. Does the voltage read 5.0 volts? Yes >> Go To 3 Perform the BODY VERIFICATION TEST — VER 1. No >> Replace the Headlamp Switch in accordance with the service information. Perform the BODY VERIFICATION TEST — VER 1. 8L - 70 LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS ND |