A Preliminary Information

IMPORTANT: The following steps must be completed before using the symptom table.
^ 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.
^ 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 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 in 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
^ Courtesy or Dome Lamps Always On
^ Courtesy Lamps Inoperative with IP Dimmer Switch
^ Courtesy Lamps Inoperative with Doors Open
^ Daytime Running Lamps (DRL) Headlamps Always On
^ Daytime Running Lamps (DRL) Headlamps Inoperative
^ Hazard Lamps Always On
^ Hazard Lamps Inoperative
^ Headlamps Inoperative - Low Beams
^ Headlamps Inop - Low Beams w/Windshield Wipers On
^ Headlamps - Low Beams On with Headlamp Switch Off
^ Headlamps Inoperative - High Beams
^ Headlamps Inoperative - Flash to Pass
^ Headlamps Inoperative - One Lamp
^ Headlamps Inoperative - Low and High Beams
^ Headlamp Switch On Indicator Always On
^ Headlamp Switch On Indicator Inoperative
^ High Beam Indicator Inoperative
^ High Beam Indicator Always On
^ 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 Always On
^ Incandescent Lamps Inoperative
^ Door Lamp Inoperative - LF
^ Door Lamp Inoperative - RF
^ Door Lamp Inoperative - LR
^ Door Lamp Inoperative - RR
^ Lamps Inoperative - LF and/or RF Switches
^ License Lamps Inoperative
^ License, Underhood and Cornering Lamps Inoperative
^ Park Lamps Always On
^ Park Lamps Inoperative
^ Park Lamps Inoperative - Left
^ Park Lamps Inoperative - Right
^ Reading Lamp(s) Inoperative
^ Stop Lamps Inoperative - All
^ Stop Lamps Inoperative - CHMSL Operates
^ Stop Lamps Always On
^ Turn Signal Lamps Inoperative
^ Turn Signal and Hazard Lamps Inoperative
^ Turn Signal Lamps and Indicators Inop - One Side
^ Turn Signal Indicators Inoperative - Left
^ Turn Signal Indicators Inoperative - Right
^ Turn Signal Lamps Always On - One Side
^ Twilight Sentinel Inoperative
^ VF Displays Inoperative - All