For 1990-2009 cars

Important: The following steps must be completed before doing the Symptom tables.

1. Perform the Diagnostic System Check - Vehicle .

• | No DTCs are set.

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

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Exterior Lighting Systems Description and Operation or 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 Malfunction

• | Courtesy Lamps Always On

• | Courtesy Lamps Inoperative

• | Fog Lamp Indicator Inoperative

• | Daytime Running Lamps (DRL) Inoperative

• | Fog Lamps Always On

• | Fog Lamps Inoperative

• | Daytime Running Lamps (DRL) Indicator Inoperative

• | Hazard Lamps Inoperative

• | Headlamp Low or High Beams Always On

• | Low and High Beams Headlamps Inoperative

• | Headlamps Inoperative - High Beams

• | Headlamps Inoperative - Low Beams

• | Headlamps Flash to Pass Inoperative

• | Park Lamps Inoperative

• | Illuminated Entry Lamps Inoperative

• | Interior Backlighting Does Not Dim

• | Interior Backlighting Inoperative

• | High Beam Indicator Inoperative

• | Reading Lamp Inoperative

• | Park Lamps Always On

• | Stop Lamps Always On

• | Stop Lamps Inoperative

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

• | Turn Signal Lamps and/or Indicators Inoperative