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 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
^ Backup Lamps Inoperative
^ Cornering Lamps Inoperative
^ Courtesy Lamps Always On
^ Courtesy Lamps Inoperative
^ Courtesy Lamps Inoperative with Headlamp Switch
^ Courtesy Lamps Inoperative with Doors Open (LH Door) or Courtesy Lamps Inoperative with Doors Open (RH door)
^ Courtesy Lamps Inop w/ Unlock of Any Door/Liftgate (Left Door) or Courtesy Lamps Inop w/ Unlock of Any Door/Liftgate (Right Door)
^ Daytime Running Lamps (DRL) Headlamps Always On
^ Daytime Running Lamps (DRL) Headlamps Inoperative
^ Fog Lamps Always On
^ Fog Lamps Inoperative - All
^ Fog Lamp Indicator Inoperative - Front
^ Hazard Lamps Inoperative
^ Headlamps and Park Lamps Inoperative Head/amps Inoperative - Low Beams
^ Headlamps Inop - Low Beams w/Windshield Wipers On
^ Headlamps - Low Beams On with Head/amp Switch Off
^ Headlamps Inoperative - Left High Beam
^ Headlamps Inoperative - Right High Beam
^ Headlamps Inoperative - High Beams
^ High Beam On with Headlamp Switch Off
^ IP Compartment Lamp Inoperative
^ Vanity Mirror Lamp(s) Inoperative
^ Rear Compartment Lamp(s) Inoperative
^ Incandescent Lamps Always On
^ Incandescent Lamps Inoperative
^ Park Lamps Always On
^ Park Lamps Inoperative
^ Stop Lamps Inoperative
^ Turn Signal Lamps Inoperative
^ Twilight Sentinel Inoperative
^ VF Displays Do Not Dim w/ IP Dimmer Switch
^ VF Displays Inoperative - All
^ High Beam Indicator Always On
^ High Beam Indicator Inoperative
^ LIGHTS ON Indicator Inoperative
^ 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