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, command the Interior Lamps ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states.
• If the courtesy lamps do not turn ON and OFF, refer to Courtesy Lamps Inoperative.
2. Open the rear compartment. Command the rear compartment courtesy lamp ON and OFF with a scan tool. The rear compartment courtesy lamp should turn ON and OFF when changing between the commanded states.
• If the rear compartment courtesy lamp does not turn ON and OFF, refer to Rear Compartment Lamp Inoperative.
Circuit/System Testing
Courtesy Lamps Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate courtesy lamp.
2. Test for less than 10 ohms of resistance between the appropriate ground circuit terminal and ground:
* Courtesy/Reading Lamp - Terminal A
* Vanity Mirror Lamp - Terminal B
* Roof Rail Reading Lamp - Terminal A
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the appropriate control circuit terminal and ground:
* Courtesy Lamp - Terminal A
* Vanity Mirror Lamp - Terminal B
* Dome Lamp - Terminal B
4. Ignition ON, command the Interior Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the appropriate courtesy lamp bulb.
Rear Compartment Lamp Inoperative
1. Ignition ON, observe the scan tool Trunk Ajar Switch parameter while opening and closing the rear compartment lid, the parameter should change between Trunk Closed and Trunk Ajar.
• If the parameter does not change, refer to Trunk Ajar Indicator Malfunction (Trunk Ajar Indicator Malfunction)
2. Disconnect the rear compartment courtesy lamp. Connect a test lamp between the control circuit terminal B and B+. The test lamp should illuminate.
• If the test lamp does not illuminate, test the control circuit for an open or high resistance.
3. Connect a test lamp between the B+ circuit terminal C and ground. The test lamp should illuminate.
• If the test lamp does not illuminate, test the B+ circuit for an open or high resistance.
4. Replace the rear compartment courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Dome Lamp Replacement (w/o Panoramic Sunroof) (Dome Lamp Replacement (w/o Panoramic Sunroof))Dome Lamp Replacement (w/Panoramic Sunroof) (Dome Lamp Replacement (w/Panoramic Sunroof))
* Inside Rearview Mirror Replacement (Inside Rearview Mirror Replacement)
* Sunshade Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming