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DTC B0655

DTC B0655

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 has overviews of all diagnostic categories.


DTC Descriptor

DTC B0655 5A

Brake Lamp Switch Circuit Not Plausible

Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal to the body control module (BCM). The BCM will apply battery voltage to the right, left and center stop lamp control circuits and the trailer lighting converter. The trailer lighting converter receive also a serial data message from the BCM.

Conditions for Running the DTC


• The ignition is in OFF, ACCESSORY or RUN position.

• The system voltage is between 9-16 V.


Conditions for Setting the DTC

The trailer lighting converter detects a difference between the hardwired signal and the serial data message.

Action Taken When the DTC Sets

The trailer lighting converter stores the DTC in the failure record.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior 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 information on diagnostic tools

Circuit/System Verification

Verify that the E6 Center High Mounted Stop Lamp is ON when the brake pedal is applied and OFF when the brake pedal is unapplied.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for trailer interface control module replacement, setup and programming