B2555

DTC B2555

Diagnostic Instructions

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

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B2555 01

-
Passenger Compartment Lamp Control Circuit Short to Battery

DTC B2555 02

-
Passenger Compartment Lamp Control Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

When the body control module (BCM) signals for courtesy lamp operation, a message is sent over the serial data circuit to the driver door and passenger door switches. The driver door switch and passenger door switch the applies battery voltage to the left and right courtesy lamp control circuits illuminating the door courtesy lamps. The driver door and passenger door switches also provide ground to the lamps.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* A message is sent from the BCM over the serial data circuit to the driver door and passenger door switches to active the door courtesy lamps.

Conditions for Setting the DTC

B2555 01

The driver or passenger door switch detects a short to voltage in the courtesy lamp control circuit.

B2555 02

The driver or passenger door switch detects a short to ground in the courtesy lamp control circuit.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A scan tool CLEAR DTCs command is issued for that switch module.

* 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 End Views By Name

Description and Operation

Interior Lighting Systems Description and Operation Interior Lighting Systems

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

Note:
Each courtesy lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following:

* Courtesy lighting components the vehicle is equipped with.

* Component locations on the courtesy lighting control circuit

* Each component's control and ground circuit terminals

1. Ignition OFF, disconnect the harness connector at any component with inoperative courtesy lighting.

2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit and ground.

4. Command the Courtesy Lamp control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, replace the component with the inoperative backlighting.

Repair Instructions

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

* Dome Lamp Replacement Service and Repair

* Control Module References Control Module References for driver or passenger door switch replacement, setup, and programming