Volt

DTC B2615

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 s 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 min 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.

Battery voltage must be between 9-16 V.

The front and middle dome lamps are inoperative.

When the F7DR (interior lamps) fuse is open, both dome lamps, sun visor lamps, reading lamps, and reverse lamps will be inoperative. DTC B2545 will also set for the reverse lamps when the vehicle is placed in the reverse gear.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Note: Each dome lamp may need to be disconnected to isolate the short to ground. Use the schematic to identify the following:

1. Vehicle OFF, disconnect the X5 harness connector at the K9 Body Control Module.
2. Vehicle in Service Mode, verify that a test lamp illuminates between the F7DR (interior lamps) fuse B+ circuit terminal 4 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Vehicle OFF, connect the X5 harness connector at the K9 Body Control Module.
4. Disconnect the harness connector at the inoperative dome lamp.
5. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 min, then test for less than 10 Ω between the ground circuit terminal 6 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

6. Connect a test lamp between the control circuit terminal 2 and ground.
7. 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 OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

8. If all circuits test normal, replace the appropriate dome lamp.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.