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:

   •  Headlights/Daytime Running Lights (DRL) Circuit Description
   •  Exterior Lights Circuit Description
   •  Backup Lamp Circuit Description
   •  Interior Lights Circuit Description
   •  Interior Lights Dimming Circuit Description

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
    •  Backup Lamp Inoperative - One Lamp
    •  Battery Rundown Protection Inoperative
    •  Dome Lamps Inoperative
    •  Dome Lamps Inoperative
    •  Headlamps Flash to Pass Inoperative
    •  Headlamps Inoperative - High Beams
    •  Headlamps Inoperative - Low Beams
    •  Stop Lamps Always On
    •  Stop Lamps Inoperative - One
    •  Tail Lamp Inoperative - Left Rear
    •  Park Lamp Inoperative - Right Side Front
    •  Park Lamp Inoperative - Left Side Front
    •  Side Marker Lamps Inoperative
    •  Side Marker Lamps Inoperative
    •  License Lamps Inoperative
    •  License and Tail Lamps Inoperative
    •  Inside Rearview Mirror Lamp Inoperative
    •  Inside Rearview Mirror Lamp Inoperative
    •  Dome Lamps Always On
    •  Stop Lamps Inoperative
    •  Tail Lamps Inoperative - Right Rear
    •  Headlamps Inoperative - One Lamp
    •  Twilight Sentinel Inoperative
    •  High Beam Indicator Inoperative
    •  Headlamps On in Daylight Conditions
    •  Headlamps Inoperative in Low Light Conditions
    •  Hazard Lamps Inoperative
    •  Exterior Lights System Check
    •  Instrument Panel Lamps Always On
    •  Instrument Panel Lamps Do Not Dim
    •  Headlamps Inoperative in Low Light Conditions
    •  Turn Signal Lamp Inoperative - Left Side Front
    •  Turn Signal Lamp Inoperative - Right Side Front
    •  Instrument Panel Lamps Inoperative
    •  Turn Signal Lamps Inoperative - Hazard Lamps Operate
    •  Turn Signal Lamps Inoperative - Left Side Rear
    •  Turn Signal Lamp Inoperative - Right Side Rear
    •  Turn Signal Lamps and Indicators Inoperative - One Side
    •  Turn Signal Lamps and Indicators Inoperative - One Side
    •  Turn Signal and Hazard Lamps Inoperative
    •  Turn Signal Indicators Inoperative - Left Side
        
    •  Turn Signal Indicators Inoperative - Right Side
    •  Daytime Running Lamps (DRL) Headlamps Always On
    •  Daytime Running Lamps (DRL) Headlamps Inoperative
    •  Daytime Running Lamps (DRL) Headlamps Inoperative
    •  Park Lamps Inoperative