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 B2555 00: Passenger Compartment Lamp Control Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Courtesy Lamp High Control | B2555 00 | 1 | B2555 00 | --
1. Courtesy Lamps Inoperative

### Circuit/System Description

The CTSY fuse in the I/P fuse block supplies B+ to the body control module (BCM). When the BCM receives a door open signal and the courtesy defeat switch is not active, the BCM supplies B+ to the courtesy lamps. The courtesy lamps are grounded at G302, G401, and G402.

### Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

• | DTC B2555 00 will set when the BCM detects a short to voltage in the courtesy lamp control circuit.

• | DTC B2555 00 will set when the BCM detects a short to ground in the courtesy lamp control circuit.

### Action Taken When the DTC Sets

DTC B2555 00 is present, when a short to ground or short to voltage on the courtesy lamp control circuit is present.

### 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. Disconnect the harness connector at the cargo lamp.
2. Connect a test lamp between the courtesy lamp high control circuit terminal C and ground.

⇒ | If the test lamp illuminates, locate and repair a short to voltage in the courtesy lamp high control circuit.

⇒ | If the test lamp does not illuminate, locate and repair a short to ground in the courtesy lamp high control circuit.

3. If all circuits test normal, replace the BCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming