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 body control module (BCM) supplies battery voltage to all of the courtesy lamps through the courtesy lamp supply voltage circuit. The dome lamp switch has 3 positions: DOOR, OFF, and ON. When in the DOOR position, the dome lamp operation is controlled by the body control module (BCM). The ON position provides a ground for continuous operation. Ground is provided at G302. The OFF position turns OFF any dome lamp operation. The dome lamp also contains two reading lamps that illuminate when their switch is placed in the ON position. The front courtesy/reading lamps illuminate whenever a door is opened or its switch is placed in the ON position. Ground is provided at G302. The rear compartment courtesy lamp (sedan) and the cargo lamp (extended sedan) illuminate whenever the rear decklid is open. Ground is provided at G302 through the rear compartment lid latch switch (sedan) or the cargo lamp switch (extended sedan). The vanity mirror lamps illuminate whenever they are opened. Ground is provided at G302.


Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Diagram)
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. Place the dome lamp in the DOOR position. 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 front courtesy/reading lamps should illuminate when each door is opened.

• If the dome lamp and the front courtesy/reading 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.



Circuit/System Testing

Courtesy Lamps Always On

Observe the door ajar indicator in the instrument panel cluster. The door ajar indicator should not be illuminated.

If the door ajar indicator is illuminated, refer to Door Ajar Indicator Malfunction (Non Panel Van) (Door Ajar Indicator Malfunction (Non Panel Van))Door Ajar Indicator Malfunction (Panel Van) (Door Ajar Indicator Malfunction (Panel Van)) .
Test the courtesy lamp control circuit for a short to ground. If the circuit tests normal, replace the BCM.



Courtesy Lamps Inoperative From Door
1. Open and close each door while observing the door ajar indicator. The door ajar indicator should illuminate when each door is open.

• If the door ajar indicator does not illuminate, refer to Door Ajar Indicator Malfunction (Non Panel Van) (Door Ajar Indicator Malfunction (Non Panel Van))Door Ajar Indicator Malfunction (Panel Van) (Door Ajar Indicator Malfunction (Panel Van)) .

2. Test the courtesy lamp control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.



Reading Lamp Inoperative
1. Disconnect the harness connector at the inoperative reading lamp.
2. Verify that a test lamp illuminates between the ground circuit terminal A and B+.

• If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.

3. Replace the inoperative reading lamp.



Repair Instructions

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

* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming
* Inside Rearview Mirror Replacement (Inside Rearview Mirror Replacement)
* Dome Lamp Replacement (Service and Repair)
* Sunshade Replacement (Service and Repair)