Diagnostic Instructions

DTC Descriptors

DTC B2615 00: Passenger Compartment Dimming 2 Circuit

DTC B2615 01: Passenger Compartment Dimming 2 Circuit Short to Battery

DTC B2615 02: Passenger Compartment Dimming 2 Circuit Short to Ground

DTC B2615 04: Passenger Compartment Dimming 2 Circuit Open

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Courtesy Lamps Voltage Supply	B2615 00 or B2615 02	B2615 00 or B2615 04	B2615 00 or B2615 01	--
Courtesy Lamp Ground	--	1	--	--
1. Courtesy Lamps Inoperative

Circuit/System Description

Voltage for the courtesy lamps is supplied from body control module (BCM), driver door switch, and passenger door switch . When a door is opened, a signal is applied to the door module. The door module then applies a message on the low speed GMLAN serial data communication circuit to the BCM to activate the courtesy lamps. The BCM then applies voltage to the courtesy lamps voltage supply circuit and the components on that circuit.

Conditions for Running the DTC

The ignition is ON, the BCM, driver door switch, and passenger door switch attempt to illuminate the courtesy lamps.

Conditions for Setting the DTC

The BCM, driver door switch, or passenger door switch detects a short to ground, short to voltage, or open on the courtesy lamp voltage supply circuit.

Action Taken When the DTC Sets

The BCM, driver door switch, and passenger door switch cease attempts to illuminate the courtesy lamps.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Interior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Circuit/System Verification

Ignition ON, activate the Courtesy Lamps output control with the scan tool. The interior courtesy lamps should illuminate.

Circuit/System Testing

1. Ignition OFF, disconnect all the courtesy lamps voltage supply circuit lamp components on the circuit.
2. Verify that DTC B2615 00, B2615 01, DTC B2615 02, and/or DTC B2615 04 does not reset.

⇒	If the DTC resets, test for a short to voltage, short to ground, or an open in the courtesy lamps supply voltage circuit. If the circuit/connections test normal, replace the BCM, driver door switch, and passenger door switch as applicable.

3. Reconnect each component one at a time and test for DTC B2615 00, B2615 01, DTC B2615 02, and/or DTC B2615 04.

⇒	If the DTC resets, replace that particular component.

⇒	If the DTC does not reset, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.