B2555

DTC B2555

Diagnostic Instructions

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

DTC Descriptor
DTC B2555 00
- Passenger Compartment Lamp Control Circuit

Diagnostic Fault Information





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 (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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 (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for BCM replacement, setup, and programming