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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 CTSY Fuse located in the I/P fuse block, to the body control module (BCM). When the BCM receives a signal to command the courtesy lamps ON, it then applies voltage through the courtesy lamps supply voltage circuits to the courtesy lamps listed below.

* Left and right footwell lamps
* Left and right liftgate lamps
* Courtesy/reading lamps
* Cargo lamp

Conditions for Running the DTC

* The BCM attempts to illuminate the courtesy lamps.
* Engine ON, the BCM attempts to illuminate the day time running lamps.
* Ignition ON with the right turn signal switch active, the BCM attempts to illuminate the right front turn signal.

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 not attempt to activate 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 ignition cycles have occurred.

Circuit/System Verification

Ignition ON, command the Courtesy Lamps ON and OFF with a scan tool. The 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. 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 supply voltage circuits listed below for a short to ground.

* Courtesy lamp supply voltage terminal 1 X6
* Courtesy lamp supply voltage terminal 5 X2

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

* Courtesy lamp supply voltage terminal 1 X6
* Courtesy lamp supply voltage terminal 5 X2

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 supply voltage 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.

Repair Instructions

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

* Reading Lamp Replacement
* Roof Rear Console Replacement
* Instrument Panel Courtesy Lamp Bulb Replacement - Left Side
* Instrument Panel Courtesy Lamp Bulb Replacement - Right Side
* Rear Liftgate Lamp Replacement
* Instrument Panel Compartment Trim Plate Replacement (Acadia) Instrument Panel Compartment Trim Plate Replacement (Enclave) Instrument Panel Compartment Trim Plate Replacement (Outlook)