GM Service Manual Online
For 1990-2009 cars only

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

  1. Perform Diagnostic System Check - Lighting Systems before using the Symptom Tables in order to verify that there are no DTCs set.
  2. Review the system description in order to familiarize yourself with the system functions. Refer to Lighting System Description .

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:

    •  Backup Lamps Always On
    •  Backup Lamps Inoperative
    •  Backup Lamp Inoperative - One Lamp
    •  Courtesy Lamps Always On
    •  Courtesy Lamps Inoperative
    •  Courtesy Lamps Inoperative with Instrument Panel Dimmer Switch
    •  Courtesy or Reading Lamps Inoperative with Lamp Switch
    •  Courtesy Lamps Inoperative with Doors Open
    •  Courtesy Lamps Inoperative with Rear Compartment Lid Open
    •  Courtesy/Reading Lamps Always On
    •  Courtesy/Reading Lamps Inoperative
    •  Daytime Running Lamps (DRL) Headlamps Inoperative
    •  Daytime Running Lamps (DRL) Headlamps Inoperative
    •  Exterior Lamps Inoperative - All
    •  Fog Lamps Always On
    •  Fog Lamps Always On
    •  Fog Lamps Inoperative - All
    •  Fog Lamps Inoperative - All
    •  Fog Lamps Inoperative - All
    •  Fog Lamps Inoperative - One
    •  Fog Lamp Switch Illumination Lamp Inoperative
    •  Fog Lamp Indicator Inoperative
    •  Fog Lamp Indicator Inoperative
    •  Fog Lamp Indicator Inoperative
    •  Hazard Lamps Inoperative
    •  Headlamp Low or High Beams Always On
    •  Headlamp Low or High Beams Always On
    •  Headlamp Low or High Beams Always On
    •  Headlamp Low or High Beams Always On
    •  Headlamps Inoperative - Low Beams
    •  Headlamps Inoperative - Low Beams
    •  Headlamps Inoperative - High Beams
    •  Headlamps Inoperative - One Lamp
    •  Headlamps Inoperative - One Lamp
    •  Low and High Beams Headlamps Inoperative
    •  Low and High Beams Headlamps Inoperative
    •  Headlamps Inoperative in Low Light Conditions
    •  Headlamps, Parklamps, Daytime Running Lamps (DRL) On with Park Brake Applied
    •  Headlamp Opening Door Inoperative
    •  Headlamp Doors Inoperative - One Door
    •  Headlight Leveling Inoperative - One Actuator
    •  Headlight Leveling Inoperative
    •  Headlight Leveling Inoperative - Actuator Switch Illuminated
    •  High Beam Indicator Always On
    •  High Beam Indicator Inoperative
    •  Instrument Panel Compartment Lamp Inoperative
    •  Instrument Panel Lamps Do Not Dim
    •  Instrument Panel Lamps Inoperative
    •  Instrument Panel Lamps Inoperative - One
    •  Park Lamps Inoperative
    •  Park Lamps Inoperative - Left Side
    •  Park Lamps Inoperative - Right Side
    •  Park/Turn Lamps Inoperative - Front
    •  Park/Turn Lamps Inoperative - One Front
    •  Position Lamps Inoperative - Left Side
    •  Side Marker Lamp Inoperative - One Lamp
    •  Stop Lamps Inoperative
    •  Stop Lamps Inoperative - One
    •  Stop Lamps Inoperative - Center High Mounted Stop Lamp Operates
    •  Stop Lamps Inoperative - Center High Mounted
    •  Stop Lamps Always On
    •  Tail Lamp Inoperative - Left Rear
    •  Tail Lamps Inoperative - Right Rear
    •  Turn Signal Lamps Inoperative
    •  Turn Signal Lamp Inoperative - Left Side Front
    •  Turn Signal Lamp Inoperative - Right Side Front
    •  Turn Signal and Hazard Lamps Inoperative
    •  Turn Signal Lamps Inoperative - Left Side Rear
    •  Turn Signal Lamp Inoperative - Right Side Rear
    •  Turn Lamps Always On
    •  Turn Signal Indicator Always On - Left Side
    •  Turn Signal Indicator Always On - Right Side
    •  Turn Signal Indicators Inoperative - Left Side
    •  Turn Signal Indicators Inoperative - Right Side
    •  Vacuum Fluorescent Displays Do Not Change with Park Lamps On
    •  Vacuum Fluorescent Display Inoperative - Radio