For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
B+, BCM X4 Terminal 2 | B2615 00 | B2615 00 | -- | --
Courtesy Lamps Control | B2615 00 | 2 | 1 | --
1. Courtesy Lamps Always On 2. Courtesy Lamps Inoperative

### 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 control 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.

### Conditions for Setting the DTC

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

### Action Taken When the DTC Sets

The BCM will not attempt to activate courtesy lamps.

### Conditions for Clearing the DTC

A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### 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 control circuits listed below for a short to ground.

• | Courtesy lamp control terminal 1 X6

• | Courtesy lamp control 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 control circuits listed below.

• | Courtesy lamp control terminal 1 X6

• | Courtesy lamp control 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 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.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | 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

• | Control Module References for BCM replacement, setup, and programming