GM Service Manual Online
For 1990-2009 cars only

Important: The following steps must be completed before using the symptoms tables.

Review the system operation in order to familiarize yourself with the system functions. Refer to the following procedures:

    â€¢  Exterior Lighting Systems Description and Operation
    â€¢  Interior Lighting Systems Description and Operation

Visual/Physical Inspection

Several of the symptom procedures ask for a careful visual/physical inspection. This step is extremely important. It could lead to correcting a problem without further checks and can save valuable time.

These checks include the following:

    â€¢ Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories .
    â€¢ Inspect the easily accessible or visible system components and harness connectors for obvious damage or conditions which could cause the symptom.
    â€¢ If only one lamp is inoperative, inspect and repair a poor connection or an open in the power feed or ground circuit before replacing the light bulb. Refer to Circuit Testing and Wiring Repairs .

Intermittent

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

Symptom List

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

    â€¢  Automatic Transaxle Gear Position Illumination Lamp Inoperative, All Other Instrument Lamps OK
    â€¢  Headlamps-On Reminder Chime Inoperative
    â€¢  Low Beams Inoperative
    â€¢  High Beams Inoperative
    â€¢  Low and High Beams Inoperative
    â€¢  Parking Lamps and Taillamps Inoperative
    â€¢  High Mount Stop Lamp Inoperative
    â€¢  Rear Compartment Lamp Inoperative
    â€¢  Front Fog Lamps Inoperative
    â€¢  Backup Lamps Inoperative
    â€¢  Daytime Running Lamps (DRL) Inoperative
    â€¢  Dome Lamps Inoperative
    â€¢  Hazard Lamps Inoperative
    â€¢  Instrument Panel Illumination Lamps Inoperative
    â€¢  Instrument Cluster Indicator Lamps
    â€¢  Stop Lamps Always On
    â€¢  Stop Lamps Inoperative
    â€¢  Turn Signal Lamps and/or Indicators Inoperative