Courtesy Lamps Malfunction

Courtesy Lamps Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



Circuit/System Description

The courtesy lamp high control circuit supplies voltage to the courtesy lamps and cargo lamps. The lamps are illuminated when they receive a battery positive voltage from the courtesy lamp high control circuit of the body control module (BCM). The BCM will supply voltage to the courtesy lamp high control circuit for illuminated entry under the following conditions:

* The ignition is in the LOCK position.
* The I/P dimmer switch is in the door position.
* The door jamb input transitions to an active state (opening a door).
* The use of the RKE to unlock the side doors


When the driver uses the remote function actuator transmitter to unlock the doors, the BCM will illuminate the courtesy lamps for approximately 40 seconds, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position, the courtesy lamps will turn OFF immediately. When the door latch switch signal circuit is active with the ignition in the OFF position, the BCM will illuminate the courtesy lamps. The courtesy lamps will remain illuminated for approximately 25 seconds after the door latch switch signal circuit becomes inactive, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position, the courtesy lamps will turn OFF immediately.


Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Verification

1. Ignition ON, all doors closed. The interior courtesy lamps should not be illuminated.

• If the interior courtesy lamps are illuminated, refer to Courtesy Lamps Always On.

2. Open and close each door. The dome lamp and the courtesy lamps should illuminate when each door is opened.

• If the courtesy lamps do not illuminate, refer to Courtesy Lamps Inoperative From Door.

3. Place the reading lamps in the ON position. The reading lamps should illuminate. If the reading lamp does not illuminate, refer to Reading Lamp Inoperative.
4. Open the vanity mirrors. The vanity mirror lamps should illuminate.

• If the vanity mirror lamps do not illuminate, refer to Vanity Mirror Lamps Inoperative.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Control Module References (Programming and Relearning)
* Rear Compartment Lid Latch Replacement (Service and Repair)
* Rear Compartment Lid Switch Replacement (Service and Repair)
* Inside Rearview Mirror Replacement (Inside Rearview Mirror Replacement)
* Dome Lamp Replacement (Service and Repair)
* Sunshade Replacement (Service and Repair)