The body control module (BCM) applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a serial data message to the driver door module (DDM) and front passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power courtesy lamp control circuit to prevent a total battery discharge condition.

Battery voltage must be between 9-16 volts.

DTC B2615 00 will set for the following conditions:

The BCM will not illuminate any courtesy lamps supplied by the courtesy lamps voltage supply circuit.

Schematic Reference

Interior Lights Schematics

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

1. Ignition OFF, disconnect the X4 harness connector at the BCM.
2. Ignition ON, verify that a test lamp illuminates between the BCM 3 fuse B+ circuit terminal 2 and ground.

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

3. Ignition OFF, connect the X4 harness connector at the BCM.
4. Ignition ON, with a scan tool clear all DTCs.
5. Ignition OFF, disconnect the harness connectors at the following components:

•	Courtesy/reading lamp - left front

•	Courtesy/reading lamp - left rear

•	Courtesy/reading lamp - right front

•	Courtesy/reading lamp - right rear

•	Left footwell lamp

•	Right footwell lamp

•	Courtesy lamp left rear door

•	Courtesy lamp right rear door

6. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.

⇒	If the DTC resets, test the appropriate control circuit listed below for a short to ground. If the circuit tests normal, replace the BCM.

•	Courtesy/reading lamp - left front terminal A

•	Courtesy/reading lamp - left rear terminal A

•	Courtesy/reading lamp - right front terminal A

•	Courtesy/reading lamp - right rear terminal A

•	Left footwell lamp terminal A

•	Right footwell lamp terminal A

•	Courtesy lamp left rear door terminal A

•	Courtesy lamp right rear door terminal A

7. Reconnect each component one at a time and verify the DTC does not reset as current.

⇒	If the DTC resets as current, test or replace the component responsible for setting the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.