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 lamps will remain illuminated until the switch is placed in either the DOOR or OFF position. When in the DOOR position, the dome lamps 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 lamps 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 lamps 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 lamps will be disabled. In the event that the dome lamps were to remain illuminated for more than 10 minutes with the vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the dome lamps control circuit to prevent total battery discharge.
Reference Information
Schematic Reference
* Interior Lights Schematics Interior Lights Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
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 Programming and Relearning for scan tool information
Circuit/System Verification
1. Vehicle in Service Mode, 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 front and middle dome lamp should turn ON and OFF when changing between the commanded states.
• If one or both of the dome lamps do not turn ON and OFF when commanded, refer to Dome Lamps Malfunction.
Circuit/System Testing
Dome Lamp Switch Malfunction
1. Vehicle OFF, disconnect the harness connector at the E37F dome/reading lamps - front.
2. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 10 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. Vehicle in Service Mode, 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 a 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 E37F dome/reading lamps - front.
Dome Lamps Malfunction
1. Vehicle OFF, disconnect the harness connector at the inoperative dome lamp.
2. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 10 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. Vehicle in Service Mode, 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 inoperative dome lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Reading Lamp Replacement Service and Repair
* Dome and Reading Lamp Replacement Service and Repair
* Control Module References Programming and Relearning for BCM replacement, setup, and programming