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/courtesy 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, door courtesy lamps, and instrument panel courtesy 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, door courtesy lamps, and instrument panel courtesy 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/courtesy lamps will be disabled. In the event that the dome/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 dome/courtesy lamps 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
Description and Operation
Power Mode Description and Operation Power Mode
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.
2. Verify the scan tool Door Ajar Sw. parameter changes between Active and Inactive while opening and closing each vehicle door.
• If the parameter does not change
Refer to Door Ajar Indicator Malfunction Door Ajar Indicator Malfunction.
• If the parameter changes
3. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter changes between Door, On, and Cancel while placing the dome lamp switch in the Door, On, and Cancel positions.
• If the parameter does not change
Refer to Dome Lamp Switch Malfunction.
• If the parameter changes
4. Verify the dome/courtesy lamps turn ON and OFF while commanding the Courtesy Lamps ON and OFF with a scan tool.
• If the dome/courtesy lamps do not turn ON and OFF
Refer to Dome/Courtesy Lamps Malfunction.
• If the dome/courtesy lamps turn ON and OFF
5. All OK.
Circuit/System Testing
Dome Lamp Switch Malfunction
1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the E37D dome/reading lamps - overhead console. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Door.
• If Cancel
1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 body control module.
• If On
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit terminal 5 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 body control module.
• If Door
5. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 6.
6. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Cancel.
• If not Cancel
1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If Cancel
7. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
8. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is On.
• If not On
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 5 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If On
9. Test or replace the E37D dome/reading lamps - overhead console.
Dome/Courtesy Lamps Malfunction
Note: Each component on the control circuit may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:
* Lighting components the vehicle is equipped with
* Each component's control and ground circuit terminals
* Component locations on the backlighting control circuit
1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connectors at the components listed below.
* E37D dome/reading lamps - overhead console
* E37R dome/reading lamps - rear
* E8D door courtesy lamp - driver
* E8P door courtesy lamp - passenger
* E8J instrument panel courtesy lamp - left
* E8K instrument panel courtesy lamp - right
2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground.
* E37D dome/reading lamps - overhead console terminal 6
* E37R dome/reading lamps - rear terminal 6
* E8D door courtesy lamp - driver terminal 2
* E8P door courtesy lamp - passenger terminal 2
* E8J instrument panel courtesy lamp - left terminal 2
* E8K instrument panel courtesy lamp - right terminal 2
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
* E37D dome/reading lamps - overhead console terminal 2
* E37R dome/reading lamps - rear terminal 2
* E8D door courtesy lamp - driver terminal 1
* E8P door courtesy lamp - passenger terminal 1
* E8J instrument panel courtesy lamp - left terminal 1
* E8K instrument panel courtesy lamp - right terminal 1
4. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit terminal and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
5. Test or replace the appropriate dome/courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Dome and Reading Lamp Replacement Dome and Reading Lamp Replacement
* Front Floor Flood Lamp Replacement Front Floor Flood Lamp Replacement
* Front Side Door Courtesy Lamp Lens Replacement Front Side Door Courtesy Lamp Lens Replacement
* Control Module References Control Module References for BCM replacement, programming, and setup