Courtesy Lamps Malfunction
Courtesy Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies battery voltage to the dome/reading lamps - front, left and right sunshade lamps, and instrument panel compartment lamp via the courtesy lamp control circuit. When the instrument panel compartment or a sunshade mirror is opened, the switch contact close allowing battery voltage to flow illuminating the respective lamps. The front reading lamps are controlled by individual switches that are activated by the operator when additional cabin lighting is required. In the event that any of these courtesy lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.
Reference Information
Schematic Reference
Interior Lights Schematics Interior Lights Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Description and Operation
Interior Lighting Systems Description and Operation Interior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the inoperative courtesy lamp.
2. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 5 ohm between the appropriate ground circuit terminal listed below and ground:
* E37F dome/reading lamps - front - terminal 6
* E27 instrument panel compartment lamp - terminal 2
* A3L sunshade - left - terminal B
* A3R sunshade - right - terminal B
• 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 listed below and ground:
* E37F dome/reading lamps - front - terminal 1
* E27 instrument panel compartment lamp - terminal 1
* A3L sunshade - left - terminal A
* A3R sunshade - right - terminal A
4. Command the Inadvertent Load 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 K9 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, replace the appropriate courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Instrument Panel Compartment Lamp Replacement Instrument Panel Compartment Lamp Replacement
* Reading Lamp Replacement Service and Repair
* Sunshade Illuminated Mirror Lamp Bulb Replacement Sunshade Illuminated Mirror Lamp Bulb Replacement
* Control Module References Control Module References for BCM replacement, setup, and programming