A Preliminary Information

IMPORTANT: The following steps must be completed before using the symptom tables.
1. Perform A 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 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 (Pont, Chevy Domestic)
^ Backup Lamps Inoperative (Pont, Chevy Domestic)
^ Backup Lamp Inoperative - One Lamp
^ Courtesy Lamps Always On
^ Courtesy Lamps Inoperative
^ Courtesy Lamps Inoperative with IP Dimmer Switch
^ Courtesy/Reading Lamps Inoperative w/ Lamp Switch
^ Courtesy Lamps Inoperative with Doors Open
^ Courtesy Lamps mop with Rear Compartment Lid Open
^ Courtesy/Reading Lamps Always On
^ Courtesy/Reading Lamps Inoperative
^ Daytime Running Lamps (DRL) Headlamps Inoperative (Scandinavia)
^ Daytime Running Lamps (DRL) Headlamps Inoperative (Pontiac, Chevy Domestic, Gulf States)
^ Exterior Lamps Inoperative - All
^ Fog Lamps Always On (Pont, Chevy Dom, Gulf States, Japan)
^ Fog Lamps Always On (Rear Lamps - Europe)
^ Fog Lamps Inoperative - All (Pont, Chevy Dom, Gulf States, Japan)
^ Fog Lamps Inoperative - All (Front Lamps - Europe)
^ Fog Lamps Inoperative - All (Rear Lamps - Europe)
^ Fog Lamps Inoperative - One
^ Fog Lamp Switch Illumination Lamp Inoperative (Euro, Pont, Chev Dom, Jap, Gulf State)
^ Fog Lamp Indicator Inoperative - Front (Pont, Chevy Dom, Gulf States, Japan)
^ Fog Lamp Indicator Inoperative - Front (Front Lamps - Europe)
^ Fog Lamp Indicator Inoperative - Front (Rear Lamps - Europe)
^ Hazard Lamps Inoperative
^ Headlamps Always On - Low or High Beam (Japan, Europe)
^ Headlamps Always On - Low or High Beam (Scandinavia)
^ Headlamps Always On - Low or High Beam (Pontiac)
^ Headlamps Always On - Low or High Beam (Chevrolet Domestic, Gulf States)
^ Headlamps Inoperative - Low Beams (Eur, Jap, Chev Dom, Pont, Gulf States)
^ Headlamps Inoperative - Low Beams (Scandinavia)
^ Headlamps Inoperative - High Beams
^ Headlamps Inoperative - One Lamp (Pontiac)
^ Headlamps Inoperative - One Lamp (Chev Dom, Gulf States, Jap, Eur, Scan)
^ Headlamps Inoperative - Low and High Beams (Pontiac)
^ Headlamps Inoperative - Low and High Beams (Chev Dom, Gulf States, Eur, Scan, Jap)
^ Headlamps Inoperative in Low Light Conditions (Pontiac, Chevy Dom, Gulf States)
^ Headlamps, Parklamps, Daytime Running Lamps (DRL) On with Park Brake Applied
^ Headlamp Door(s) Inoperative
^ Headlamp Doors Inoperative - One Door (Pontiac)
^ Headlight Leveling Inoperative - One Actuator (Europe)
^ Headlight Leveling Inoperative (Europe)
^ Headlight Leveling Inop - Actuator Switch Illum (Europe)
^ High Beam Indicator Always On
^ High Beam Indicator Inoperative
^ IP Compartment Lamp Inoperative
^ Instrument Panel Lamps Do Not Dim
^ Instrument Panel Lamps Inoperative
^ Instrument Panel Lamps Inoperative - One
^ Park Lamps Inoperative - Front
^ Park/Turn Lamps Inoperative - One Front
^ Position Lamps Inoperative - Left
^ Side Marker Lamp Inoperative - One Lamp
^ Stop Lamps Inoperative - All
^ Stop Lamps Inoperative - One
^ Stop Lamps Inoperative - CHMSL Operates
^ Stop Lamps Inoperative - Center High Mounted
^ Stop Lamps Always On
^ Tall Lamps Inoperative - LR
^ Tail Lamps Inoperative - RR
^ Turn Signal Lamps Inoperative
^ [1][2]Turn Signal Lamp Inoperative - LF
^ [1][2]Turn Signal Lamp Inoperative - RF
^ Turn Signal and Hazard Lamps Inoperative
^ Turn Signal Lamps Inoperative - LR
^ [1][2]Turn Signal Lamp Inoperative - RR
^ Turn Lamps Always On
^ Turn Signal Indicator Always On - Left
^ Turn Signal Indicator Always On - Right
^ Turn Signal Indicators Inoperative - Left
^ Turn Signal Indicators Inoperative - Right
^ VF Displays Do Not Change with Park Lamps On
^ VF Display Inoperative - Radio