GM Service Manual Online
For 1990-2009 cars only

Important: Review the system operation in order to familiarize yourself with the system functions.

Refer to the following:

    •  Exterior Lighting Systems Description and Operation
    •  Interior Lighting Systems Description and Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Automatic Transaxle Gear Position Illumination Lamp Inoperative, All Other Instrument Lamps OK
    •  Ashtray Lamp Inoperative
    •  High Mount Stop Lamp Inoperative
    •  Front Fog Lamps Inoperative
    •  Backup Lamps Inoperative
    •  Courtesy Lamps Inoperative
    •  Daytime Running Lamps (DRL) Inoperative
    •  Rear Fog Lamps Inoperative
    •  Hazard Lamps Inoperative
    •  Headlamps Inoperative - High Beams
    •  Headlamps Inoperative - Low Beams
    •  Low and High Beams Headlamps Inoperative
    •  Headlight Leveling Inoperative
    •  Instrument Panel Illumination Lamps Inoperative
    •  Instrument Panel Compartment Lamp Inoperative
    •  Rear Compartment Lamp Inoperative
    •  Stop Lamps Inoperative
    •  Tail Lamps Inoperative