Symptoms (Lighting Systems)

SYMPTOMS - LIGHTING SYSTEMS

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. Diagnostic System Check - Vehicle

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.
- 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.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Backup Lamps Always On Backup Lamps Always On
- Backup Lamps Inoperative Backup Lamps Inoperative
- Clearance Lamps Inoperative Clearance Lamps Inoperative
- Courtesy Lamps Always On Courtesy Lamps Always On
- Courtesy Lamps Inoperative Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Always On Daytime Running Lamps (DRL) Always On
- Daytime Running Lamps (DRL) Inoperative Daytime Running Lamps (DRL) Inoperative
- Daytime Running Lamps (DRL) On with Park Brake Applied Daytime Running Lamps (DRL) On with Park Brake Applied
- Fog Lamp Indicator Inoperative Fog Lamp Indicator Inoperative
- Fog Lamps Always On Fog Lamps Always On
- Fog Lamps Inoperative Fog Lamps Inoperative
- Hazard Lamps Always On Hazard Lamps Always On
- Hazard Lamps Inoperative Hazard Lamps Inoperative
- Headlamps Always On - Low or High Beam Headlamps Always On - Low or High Beam
- Headlamps Inoperative - High Beams Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low Beams Headlamps Inoperative - Low Beams
- Headlamps Inoperative - Low and High Beams Headlamps Inoperative - Low and High Beams
- Headlamps Inoperative - Flash to Pass Headlamps Inoperative - Flash to Pass
- High Beam Indicator Always On High Beam Indicator Always On
- High Beam Indicator Inoperative High Beam Indicator Inoperative
- Interior Backlighting Does Not Dim Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative Interior Backlighting Inoperative
- License Lamps Inoperative License Lamps Inoperative
- Off-Road Lamps Always On Off-Road Lamps Always On
- Off-Road Lamps Inoperative Off-Road Lamps Inoperative
- Marker Lamps Inoperative Marker Lamps Inoperative
- Park Lamps Inoperative Park Lamps Inoperative
- Park, License, and Tail Lamps Always On Park, License, and Tail Lamps Always On
- Park, License, and Tail Lamps Inoperative Park, License, and Tail Lamps Inoperative
- Stop Lamps Always On Stop Lamps Always On
- Stop Lamps Inoperative Stop Lamps Inoperative
- Tail Lamps Inoperative Tail Lamps Inoperative
- Turn Signal Lamps and/or Indicators Always On or Flashing Turn Signal Lamps and/or Indicators Always On or Flashing
- Turn Signal Lamps and/or Indicators Inoperative Turn Signal Lamps and/or Indicators Inoperative
- Vanity Mirror Lamp(s) Inoperative Vanity Mirror Lamp(s) Inoperative