A Symptoms - Lighting Systems

IMPORTANT: The following steps must be completed before using the symptom tables.
1. Perform Diagnostic System Check - Lighting and Horns before using the symptom tables in order to verify that all of the following are true: Diagnostic System Check - Lighting Systems
^ There are no DTCs set.
^ The body control module (BCM) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
^ Exterior Lighting and Horns Description and Operation
^ Interior Lighting and Horns Description and Operation

Visual/Physical Inspection
Several of the symptom procedures ask for a careful visual/physical check. This step is extremely important-it could lead to correcting a problem without further checks and can save valuable time. These checks include the following:
^ Inspect for aftermarket devices which could affect the operation of the Lighting System. Refer to Checking Aftermarket Accessories in Diagrams.
^ Inspect the easily accessible or visible system components and harness connectors for obvious damage or conditions which could cause the symptom.
^ If only one lamp is inoperative, inspect and repair a poor connection or an open in the power feed or ground circuit before replacing the light bulb. Refer to Circuit Testing and Wiring Repairs in Diagrams.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose a symptom that does not set a DTC:
^ Backup Lamps Always On
^ Backup Lamps Inoperative
^ Courtesy Lamps Always On
^ Courtesy Lamps Inoperative
^ Daytime Running Lamps (DRL) Indicator Inoperative
^ Fog Lamps Always On
^ Fog Lamps Inoperative
^ Hazard Lamps Inoperative
^ Headlamps Inoperative - Low Beams
^ Headlamps Inoperative - High Beams
^ Headlamps Inoperative - Low and High Beams
^ Headlamps Inoperative - Flash to Pass
^ High Beam Indicator Inoperative
^ Park Lamps Inoperative
^ Rear Compartment Lamp(s) Inoperative
^ Reading Lamp(s) Inoperative
^ Stoplamps Inoperative
^ Turn Signal Lamps and/or Indicators Inoperative