Symptoms - Lighting Systems

Symptoms - Lighting Systems

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


* 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 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 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 (Without RPO MWF) Backup Lamps Always On (Without RPO MWF)Backup Lamps Always On (RPO MWF) Backup Lamps Always On (RPO MWF)
* Backup Lamps Inoperative (Without RPO MWF) Backup Lamps Inoperative (Without RPO MWF)Backup Lamps Inoperative (RPO MWF) Backup Lamps Inoperative (RPO MWF)
* Daytime Running Lamps (DRL) Indicator Inoperative Daytime Running Lamps (DRL) Indicator Inoperative
* 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
* Dome Lamps Always On Dome Lamps Always On
* Dome Lamps Inoperative Dome Lamps Inoperative
* Hazard Lamps Inoperative Hazard Lamps Inoperative
* Headlamps Inoperative - Low Beams Headlamps Inoperative - Low Beams
* Headlamps Inoperative - High Beams Headlamps Inoperative - High Beams
* Low and High Beams Headlamps Inoperative Low and High Beams Headlamps Inoperative
* High Beam Indicator Inoperative High Beam Indicator Inoperative
* Interior Backlighting Does Not Dim Interior Backlighting Does Not Dim
* Interior Backlighting Inoperative Interior Backlighting Inoperative
* Marker Lamps Always On Marker Lamps Always On
* Marker Lamps Inoperative (w/o super chassis w/JE4 and RQ3/U86) Marker Lamps Inoperative (w/o super chassis w/JE4 and RQ3/U86)Marker Lamps Inoperative (super chassis w/JE4 and RQ3/U86) Marker Lamps Inoperative (super chassis w/JE4 and RQ3/U86)
* Marker Lamps Inoperative - Output at Trailer/Upfitter Connector Marker Lamps Inoperative - Output at Trailer/Upfitter Connector
* Park Lamps Always On Park Lamps Always On
* Park Lamps Inoperative Park Lamps Inoperative
* Stop Lamps Always On Stop Lamps Always On
* Stop Lamps Inoperative Stop Lamps Inoperative
* Stop Lamps Inoperative - Output at Trailer/Upfitter Connector Stop Lamps Inoperative - Output at Trailer/Upfitter Connector
* Tail Lamps Inoperative Tail Lamps Inoperative
* Turn Signal Lamps and/or Indicators Inoperative Turn Signal Lamps and/or Indicators Inoperative
* Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector