B2615

DTC B2615

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2615 00
- Passenger Compartment Dimming 2 Circuit

Diagnostic Fault Information






Circuit/System Description

Battery voltage for the courtesy lamps is supplied at all times, from the INT LIGHTS Fuse located in the underhood fuse block, to the body control module (BCM). When the BCM receives a signal to command the courtesy lamps ON, it applies voltage through the courtesy lamps supply voltage circuits to the courtesy lamps listed below.

* The left and right I/P courtesy lamps
* Dome lamp
* Right front turn signal

Conditions for Running the DTC

* The ignition is ON
* The courtesy lamps must be commanded ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the courtesy lamp supply voltage circuit.

Action Taken When the DTC Sets

The BCM will deactivate the courtesy lamps.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Circuit/System Verification

Ignition ON, command the Courtesy Lamps ON and OFF with the scan tool. The interior courtesy lamps should turn ON and OFF when changing between commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the X4 harness connector at the BCM.
2. Ignition ON, verify that a test lamp illuminates between the 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. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 5 and the right front turn signal for a short to ground. If all circuits and component test normal, replace the BCM

3. Ignition OFF, connect the X4 harness connector at the BCM.
4. Disconnect the harness connectors at all components fed by the BCM courtesy lamp control circuits listed below.

* Terminal 5 X2

- Left I/P Courtesy Lamp
- Right I/P Courtesy Lamp

* Terminal 1 X6

- Dome Lamp - Coupe
- Dome/Reading Lamp - Sedan

5. Ignition ON, clear the DTC with a scan tool.
6. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.

^ If the DTC resets, test the control circuits for a short to ground. If the circuits test normal, replace the BCM.

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

^ If the DTC resets, test or replace the component responsible for setting the DTC.

8. If all circuits and components test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Dome Lamp Replacement (Impala)
* Instrument Panel Courtesy Lamp Bulb Replacement.