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
--- | --- | --- | --- | ---
INT LAMPS Fuse B+ | B2615 00 | B2615 00 | -- | --
Courtesy Lamps Control | B2615 00 | 1 | 1 | --
Inadvertent courtesy Lamp Control | 1 | 1 | -- | --
Cargo Lamp Ground | -- | 1 | -- | --
Dome/Courtesy Lamp Ground | -- | 1 | -- | --
Overhead Console Courtesy/Reading Lamps Ground | -- | 1 | -- | --
1. Courtesy Lamps Malfunction

### Circuit/System Description

The body control module (BCM) receives battery voltage from the INT LAMPS fuse in order to supply power to the courtesy lamps. The BCM applies this voltage to the courtesy lamps through the courtesy lamp control circuits. When any door or the rear hatch is opened, the door open switch contacts close and the BCM receives a door or rear hatch open signal. The BCM will activate the courtesy lamp control circuit, providing battery voltage to the courtesy lamps. The courtesy lamps can be manually activated by placing the interior lamp switch in the DOME position.

The inadvertent courtesy lamp feature provides a similar function for the interior lamps as the retained accessory power feature. The BCM will energize the inadvertent courtesy lamp control circuit when the BCM is in the active state (awake) and the ignition is OFF. The BCM will continue to supply voltage to the dome, overhead courtesy, and reading lamps after the ignition is turned OFF so that the interior lamps may be operated with there individual on/off switches. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent courtesy lamp control circuit to prevent a total battery discharge condition.

### Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

DTC B2615 00 will set for the following conditions:

• | The BCM detects a short to ground in the courtesy lamps voltage supply circuit.

• | The BCM detects a short to ground or an open/high resistance in the INT LAMPS fuse B+ circuit.

### Action Taken When the DTC Sets

The BCM will not illuminate any courtesy lamps supplied by the courtesy lamps voltage supply circuit.

### 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.

### 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 Testing

1. Ignition OFF, disconnect the X4 harness connector at the BCM.
2. Ignition ON, verify that a test lamp illuminates between the INT LAMPS fuse 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.

3. Ignition OFF, connect the X4 harness connector at the BCM.
4. Ignition ON, with a scan tool clear all DTCs.
5. Ignition OFF, disconnect the harness connectors at the following components:

• | Cargo lamp

• | Dome lamp

• | Dome lamp switch

• | Overhead console courtesy/reading lamps

6. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.

⇒ | If the DTC resets, test the appropriate control circuit listed below for a short to ground. If the circuit tests normal, replace the BCM.

• | Cargo lamp terminal B

• | Dome lamp terminal A - without UUC

• | Dome lamp terminal C - without UUC

• | Dome lamp switch terminal A - with UUC

• | Overhead console courtesy/reading lamps terminal C

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

⇒ | If the DTC resets as current, test or replace the component responsible for setting the DTC.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Cargo Lamp Replacement

• | Dome Lamp Replacement

• | Reading Lamp Bulb Replacement

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