Dome Lamps Malfunction
Dome 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 dome lamp switch has 3 positions: DOOR, OFF, and ON. The ON position provides a ground for continuous operation and the dome lamp will remain illuminated until the switch is placed in either the DOOR or OFF position. When in the DOOR position, the dome lamp operation is controlled by the body control module (BCM). When any door is opened, the door ajar switch contacts close and the BCM receives a door-open input. The BCM illuminates the dome lamp when any door is opened or a door lock/unlock request is activated with the key fob. After all doors have been closed, the dome lamp will remain illuminated approximately 3 seconds after the last door closes. When the driver places the dome lamp switch in the OFF position, the dome lamp will be disabled. In the event that the dome lamp 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 dome 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 Verification
1. Ignition ON, observe the scan tool Door Ajar Sw. parameter for each door while opening and closing each vehicle door. The parameter should change between Active and Inactive.
• If the parameter does not change between the selected states, refer to Door Ajar Indicator Malfunction Door Ajar Indicator Malfunction.
2. Observe the scan tool Interior/Courtesy Lighting Master Switch parameter while placing the dome lamp switch in the Door, On, and Cancel positions. The parameter should change between Door, On, and Cancel.
• If the parameter does not change between the selected states, refer to Dome Lamp Switch Malfunction.
3. Command the Courtesy Lamps ON and OFF with a scan tool. The dome lamp should turn ON and OFF when changing between the commanded states.
• If the dome lamp does not turn ON and OFF when commanded, refer to Dome Lamp Malfunction.
Circuit/System Testing
Dome Lamp Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the E37M dome/reading lamps - middle.
2. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 5 ohm between the ground circuit terminal 6 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Door.
• If the scan tool Interior/Courtesy Lighting Master Switch parameter is Cancel, test the signal circuit terminal 4 for short to ground. If the circuit tests normal, replace the K9 BCM.
• If the scan tool Interior/Courtesy Lighting Master Switch parameter is On, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Cancel.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is On.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, replace the E37M dome/reading lamps - middle.
Dome Lamp Malfunction
1. Ignition OFF, disconnect the harness connectors at the E37M dome/reading lamps - middle.
2. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 5 ohm between the ground circuit terminal 6 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 2 and ground.
4. Command the Courtesy 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 K9 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 K9 BCM.
5. If all circuits test normal, replace the E37M dome/reading lamps - middle.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Dome Lamp Replacement (with Sunroof) Dome Lamp Replacement (with Sunroof)Dome Lamp Replacement (without Sunroof) Dome Lamp Replacement (without Sunroof)
* Dome Lamp Bulb Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming