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 Descriptor
DTC B2555 02
- Passenger Compartment Lamp Control Circuit Short to Ground

Diagnostic Fault Information





Circuit/System Description

The F2DA fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. The door open input can be overridden by pressing the courtesy lamp switch located on the front dome/reading lamps.

Conditions for Running the DTC

* The ignition is ON.
* When a door is open.

Conditions for Setting the DTC

The BCM detects a short to ground on the interior lamp defeat switch signal or on the courtesy lamp switch signal circuits.

Action Taken When the DTC Sets

The courtesy lamps cannot be turned off when any door is in the open or ajar position.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction 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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool Interior/Courtesy Lighting Master Switch parameter while pressing the courtesy lamp defeat switch. The parameter should toggle between Off and Door each time the switch is pressed.
2. Ignition ON, observe the scan tool Dome Lamp Switch parameter while pressing the courtesy lamp switch. The parameter should toggle between Inactive and Active each time the switch is pressed.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the E37F dome/reading lamps-front.
2. Test for less than 30 ohm between the ground circuit terminal 6 and ground.

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

3. Ignition ON, test for greater than 10V between the signal circuit terminal listed below and ground:

* Signal terminal 4
* Signal terminal 5

• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.

4. If the all circuits test normal, replace the E37F dome/reading lamps-front.

Repair Instructions

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

* Roof Console Replacement (Roof Console Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming