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	1	2	--
Courtesy Lamp Ground	--	1	--	--
1. Courtesy Lamps Inoperative 2. Courtesy Lamps Always On

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

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

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 the harness connector at an affected lamp bulb.
2. Test for less than 1 ohm of resistance between the ground circuit terminal 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 and the ground circuit terminal.
4. Ignition ON, command the Courtesy Lamps output control on and off with the scan tool. The test lamp should turn on and off.

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

5. If all circuits test normal, test or replace the bulb.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.