For 1990-2009 cars

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

1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true:

• | There are no DTCs set.

• | The control modules can communicate via the serial data link.

2. Review the system operation and circuit descriptions that apply to the customer complaint in order to familiarize yourself with the system functions. Refer to the following list:

• | Exterior Lighting Systems Description and Operation

• | Interior Lighting Systems Description and Operation

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories .

• | 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 .

### 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

• | Courtesy Lamps Always On

• | Courtesy Lamps Inoperative

• | Daytime Running Lamps (DRL) Always On

• | Daytime Running Lamps (DRL) Indicator Inoperative

• | Daytime Running Lamps (DRL) Inoperative

• | Daytime Running Lamps (DRL) On with Park Brake Applied

• | Fog Lamp Indicator Inoperative

• | Fog Lamps Always On

• | Fog Lamps Inoperative

• | Hazard Lamps Always On

• | Hazard Lamps Inoperative

• | Headlamp Low or High Beams Always On

• | Headlamps Inoperative - High Beams

• | Headlamps Inoperative - Low Beams

• | Low and High Beams Headlamps Inoperative

• | Headlamps Flash to Pass Inoperative

• | High Beam Indicator Always On

• | High Beam Indicator Inoperative

• | Interior Backlighting Does Not Dim

• | Interior Backlighting Inoperative

• | License Lamps Inoperative

• | Marker Lamps Inoperative

• | Park Lamps Inoperative

• | Park, License, and Tail Lamps Always On

• | Park, License, and Tail Lamps Inoperative

• | Stop Lamps Always On

• | Stop Lamps Inoperative

• | Tail Lamps Inoperative

• | Turn Signal Lamps and/or Indicators Always On or Flashing

• | Turn Signal Lamps and/or Indicators Inoperative