Buick Regal: DTC B255D
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 B255D 02
Passenger Compartment Lamp Control 2 Circuit Short to Ground
Diagnostic Fault Information
1. Interior Accent Lighting Malfunction
Circuit/System Description
The body control module (BCM) supplies battery voltage to accent lamps via
the accent lamp control
circuit. When a door is opened the BCM applies battery voltage to the accent
lamp control circuit
illuminating the driver and passenger door accent lamps. The accent lamps will
remain illuminated until
all doors are closed and the ignition is OFF.
Conditions for Running the DTC
Battery voltage must be between 9 - 16 V.
Conditions for Setting the DTC
The BCM detects a short to ground in the accent lamp control circuit terminal
23 X1
Actions Taken When the DTC Sets
The BCM will disable the accent lamp control 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 Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
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, scan tool disconnected, all doors closed, all accessories
OFF, disconnect the harness
connector the E1W Accent Lamp - Instrument Panel. It may take up to 2 min for
all vehicle
systems to power down.
2. Test for less than 15 Ω between the ground circuit terminal 1 and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 15 Ω
3. Connect a test lamp between the control circuit terminal 2 and ground,
ignition ON.
4. Verify the test lamp turns ON and OFF when commanding the Accent Lighting ON
and OFF with
a scan tool.
- If the test lamp is always OFF
- Ignition OFF, disconnect the X1 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
- Ignition OFF, disconnect the X1 harness connector at the K9 Body Control
Module, ignition
ON.
- Test for less than 1 V between the control circuit terminal and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K9 Body Control Module.
- Go to next step: If the test lamp turns ON and OFF
5. Test or replace the E1W Accent Lamp - Instrument Panel.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Instrument Panel Center Trim Plate Applique Replacement for BCM replacement,
programming, and setup.
Control Module References for BCM replacement, programming, and setup.
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
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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.
Circuit/System De