A Symptoms - Lighting Systems

SYMPTOMS - LIGHTING SYSTEMS

IMPORTANT: Complete the following steps before using the symptom tables.

1. Perform the Diagnostic System Check - Lighting Systems before using the Symptom Tables in order to verify that all of the following are true:
- No DTCs are set.
- The control module can communicate via the serial data link. Diagnostic System Check - Lighting Systems
2. Review the system description and operation in order to familiarize yourself with the system functions.

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 Inoperative
- Courtesy Lamps Inoperative
- Courtesy Lamps Always On
- Daytime Running Lamps (DRL) Inoperative
- Fog Lamps Always On
- Fog Lamps Inoperative
- Hazard Lamps Inoperative
- Hazard Lamps Always On
- Headlamps Always On - Low or High Beam
- Headlamps Inoperative - Low Beams
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low and High Beams
- High Beam Indicator Inoperative
- Interior Backlighting Inoperative
- Illuminated Entry Lamps Inoperative
- Interior Lamps Off Switch Inoperative
- Park Lamp Out Indicator Inoperative
- Park Lamps Always On
- Park Lamps Inoperative
- Park Lamps Inoperative - Output at Trailer/Upfitter Connector
- Reading Lamp(s) Inoperative
- Stop Lamps Always On
- Stop Lamps Inoperative
- Turn Signal Lamps and/or Indicators Inoperative
- Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector