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 Instrument Panel Description .

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the system. Refer to Checking Aftermarket Accessories.
    • 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.

Symptom List

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

    •  Backup Lamps Inoperative
    •  Daytime Running Lamps (DRL) Inoperative
    •  Fog Lamps Inoperative
    •  Headlamps Inoperative - High Beams
    •  Headlamps Inoperative - Low Beams
    •  Low and High Beams Headlamps Inoperative
    •  High Mount Stop Lamp Inoperative
    •  Illuminated Entry Lamps Inoperative
    •  Rear Compartment Lamp Inoperative
    •  Stop Lamps Inoperative
    •  Tail Lamps Inoperative
    •  Turn Signal Lamps and/or Indicators Inoperative