Diagnostic Aids
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- The following conditions may cause an intermittent malfunction:
- An intermittent short to voltage in the ambient light sensor signal circuit.
- An intermittent short to voltage in the ambient light sensor reference circuit.
- If the ambient light sensor circuit is open or shorted (to ground or voltage), the BCM will command the automatic headlamps and park lamps ON. If the ignition is cycled the BCM will retest for any malfunctions in the ambient light sensor circuit and if a malfunction is current the BCM will activate the automatic.
- If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.