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DTC B255D

DTC B255D

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle

• Review Strategy Based Diagnosis

• Diagnostic Procedure Instructions


DTC Descriptor

DTC B255D 02

Passenger Compartment Lamp Control 2 Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Interior Backlighting Control

B255D 02

2

1

-

1. Accent lamp LEDs at full intensity and cannot be dimmed or turned OFF

2. Accent lamp LEDs do not illuminate



Circuit/System Description

The body control module (BCM) supplies a voltage reference through the instrument panel cluster dimming voltage reference circuit to the instrument panel cluster lamps dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the instrument panel cluster lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a variable voltage through the LED backlight lamp control circuit illuminating the components listed below:


• Accent Lamp - Driver Door

• Accent Lamp - Passenger Door


Conditions for Running the DTC


• The ignition is ON.

• The headlamps or park lamps are ON.


Conditions for Setting the DTC

The BCM detects a short to ground on the LED backlight lamp control circuit.

Action Taken When the DTC Sets

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

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

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

Circuit/System Verification

Command the Accent Lighting 2 test ON and OFF with a scan tool. The E1D Accent Lamp - Driver Door and E1P Accent Lamp - Passenger Door should be ON and OFF.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the appropriate accent lamp.

2. Test for less than 5 Ω between the black wire of the appropriate and ground.

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

4. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit test normal, replace the appropriate accent lamp.

5. Connect a test lamp between the accent lamp control circuit terminal 1 and ground.

6. Command the Accent Lighting 2 test ON and OFF with a scan tool. The appropriate accent lamp should be ON and OFF.

7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

8. If the test lamp is always OFF, test the control circuit for a short to round or open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

9. If the all circuits test normal, replace appropriate accent lamp.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Side Door Sill Courtesy Lamp Replacement

• Control Module References for BCM, HVAC control module, and radio replacement, setup, and programming