For 1990-2009 cars

Important: Review the system operation in order to familiarize yourself with the system functions. Refer to :

• | 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 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 Conditions 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

• | Daytime Running Lamps (DRL) Indicator Inoperative

• | Daytime Running Lamps (DRL) Inoperative

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

• | Dome Lamps Always On

• | Dome Lamps Inoperative

• | Hazard Lamps Inoperative

• | Headlamps Inoperative - Low Beams

• | Headlamps Inoperative - High Beams

• | Low and High Beams Headlamps Inoperative

• | High Beam Indicator Inoperative

• | Interior Backlighting Does Not Dim

• | Interior Backlighting Inoperative

• | Marker Lamps Always On

• | Marker Lamps Inoperative

• | Marker Lamps Inoperative - Output at Trailer/Upfitter Connector

• | Park Lamps Always On

• | Park Lamps Inoperative

• | Stop Lamps Always On

• | Stop Lamps Inoperative

• | Stop Lamps Inoperative - Output at Trailer/Upfitter Connector

• | Tail Lamps Inoperative

• | Turn Signal Lamps and/or Indicators Inoperative

• | Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector