- Symptoms - Lighting

Symptoms - Lighting

1. Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) , 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.

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

* Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
* Interior 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 (Component Tests and General Diagnostics).
* 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 (Component Tests and General Diagnostics).

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* Backup Lamps Malfunction (Backup Lamps Malfunction)
* Courtesy Lamps Malfunction (Courtesy Lamps Malfunction)
* Daytime Running Lamps Malfunction (With Z88, Z75, and Z88) (Daytime Running Lamps Malfunction (With Z88, Z75, and Z88))Daytime Running Lamps Malfunction (With T4Q) (Daytime Running Lamps Malfunction (With T4Q))
* Front Fog Lamps Malfunction (Front Fog Lamps Malfunction)
* Rear Fog Lamps Malfunction (Rear Fog Lamps Malfunction)
* Hazard Lamps Malfunction (Hazard Lamps Malfunction)
* Headlamps Malfunction (With X88, Z75, and Z88) (Headlamps Malfunction (With X88, Z75, and Z88))Headlamps Malfunction (With T4Q) (Headlamps Malfunction (With T4Q))
* Interior Backlighting Malfunction (Interior Backlighting Malfunction)
* Park, License, and/or Tail Lamps Malfunction (With X88, Z75, and Z88) (Park, License, and/or Tail Lamps Malfunction (With X88, Z75, and Z88))Park, License, and/or Tail Lamps Malfunction (Front LED Park/Marker Lamps with T4Q) (Park, License, and/or Tail Lamps Malfunction (Front LED Park/Marker Lamps with T4Q))
* Stop Lamps Malfunction (Stop Lamps Malfunction)
* Turn Signal Lamps and/or Indicators Malfunction (Turn Signal Lamps and/or Indicators Malfunction)