GM Service Manual Online
For 1990-2009 cars only

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

   •  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 Systems. 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:

    •  Backup Lamps Inoperative
    •  Backup Lamps Always On
    •  Dome Lamps Inoperative
    •  Headlamps Flash to Pass Inoperative
    •  Headlamps Inoperative - High Beams
    •  Headlamps Inoperative - Low Beams
    •  Stop Lamps Always On
    •  Stop Lamps Inoperative
    •  Tail Lamps Inoperative
    •  Park Lamps Inoperative
    •  License Lamps Inoperative
    •  Tail Lamps Inoperative
    •  Inside Rearview Mirror Lamp Inoperative
    •  Dome Lamps Always On
    •  Daytime Running Lamps (DRL) Inoperative
    •  Hazard Lamps Inoperative