A Preliminary Information

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

1. Perform the A Diagnostic System Check - Lighting Systems before using the Symptom Tables in order to verify that all of the following are true:
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Lighting System Operation.

VISUAL/PHYSICAL INSPECTION
^ Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories at Diagnostic Aids under Diagrams.
^ 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 at Diagnostic Aids under Diagrams.

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
^ Cornering Lamps Inoperative
^ Courtesy Lamps Inoperative (All) or Courtesy Lamps Inoperative (Front) or Courtesy Lamps Inoperative (Rear)
^ Courtesy or Dome Lamps Always On (All) or Courtesy or Dome Lamps Always On (Front) or Courtesy or Dome Lamps Always On (Rear)
^ Courtesy Lamps Inoperative with IP Dimmer Switch
^ Courtesy Lamps Inoperative with Doors Open
^ Daytime Running Lamps (DRL) Headlamps Always On (Domestic) or Daytime Running Lamps (DRL) Headlamps Always On (Norway and Sweden)
^ Daytime Running Lamps (DRL) Headlamps Inoperative (Domestic) or Daytime Running Lamps (DRL) Headlamps Inoperative (Norway and Sweden)
^ Fog Lamps Always On - Front
^ Fog Lamps Always On - Rear
^ Fog Lamps Inoperative - Front
^ Fog Lamps Inoperative - Rear
^ Fog Lamp Indicator Inoperative - Front
^ Fog Lamp Indicator Inoperative
^ Fog Lamp Indicator Always On
^ Fog Lamp Indicator Always On - Rear
^ Hazard Lamps Always On
^ Hazard Lamps Inoperative
^ Headlamps Inoperative - Low Beams (Domestic, Europe, and Japan) or Headlamps Inoperative - Low Beams (Norway and Sweden)
^ Headlamps mop - Low Beams W/Windshield Wipers On
^ Headlamps - Low Beams On with Headlamp Switch Off (Domestic, Europe, and Japan) or Headlamps - Low Beams On with Headlamp Switch Off (Norway and Sweden)
^ Headlamps Inoperative - High Beams (Domestic, Europe, and Japan) or Headlamps Inoperative - High Beams (Norway and Sweden)
^ Headlamps Inoperative - Flash to Pass
^ Headlamps Inoperative - One Lamp (Domestic) or Headlamps Inoperative - One Lamp (Export)
^ Headlamps Inoperative - Low and High Beams (Domestic, Europe, and Japan) or Headlamps Inoperative - Low and High Beams (Norway and Sweden)
^ High Beam Indicator Always On
^ High Beam Indicator Inoperative
^ High Beam On with Headlamp Switch Off
^ IP Compartment Lamp Inoperative
^ Vanity Mirror Lamp(s) Inoperative
^ Underhood Lamp Inoperative
^ Rear Compartment Lamp(s) Inoperative
^ Incandescent Lamps Inoperative
^ Door Lamp Inoperative - LF
^ Door Lamp Inoperative - RF
^ Door Lamp Inoperative - LR
^ Door Lamp Inoperative - RR
^ License Lamps Inoperative
^ License, Underhood and Cornering Lamps Inoperative
^ LIGHTS ON Indicator Always On
^ LIGHTS ON Indicator Inoperative
^ Park Lamps Always On
^ Park Lamps Inoperative
^ Park, Tall and Side Marker Lamps Inoperative
^ Position Lamps Inoperative
^ Position Lamps Inoperative - Left
^ Position Lamps Inoperative - Right
^ Reading Lamp(s) Inoperative
^ Stop Lamps Inoperative
^ Stop Lamps Always On
^ Turn Signal Lamps mop - Hazard Lamps Operate
^ Turn Signal Lamps and Indicators Inop - One Side
^ Turn Signal Indicator Always On - Left
^ Turn Signal Indicator Always On - Right
^ Turn Signal Indicators Inoperative - Left
^ Turn Signal Indicators Inoperative - Right
^ Turn Signal Lamps Always On - One Side
^ Twilight. Sentinel Inoperative
^ VF Displays Do Not Dim WI IP Dimmer Switch
^ VF Display Inoperative - Heater and A/C Control
^ VF Displays Inoperative - All