Service Information

Captiva

DTC C0161

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using the 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 C0161 00: Antilock Brake System (ABS) Brake Switch Circuit

The normally-open brake lamp switch supplies battery voltage to the engine control module (ECM) when the brake pedal is pressed. The ECM sends a brake pedal applied serial data message to the electronic brake and traction control module and to the transmission control module (TCM).

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

•	The EBCM detects an open in the brake signal circuit.

•	Both brake lamps are faulty.

Action Taken When the DTC Sets

•	The EBCM stores this information only code DTC for as long as the condition is present.

•	The ABS remains functional.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present.

•	The DTC is cleared with a scan tool.

•	The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

•	A signal circuit of the brake lamp switch is open.

•	The brake lamp switch is improperly adjusted.

•	All brake lamps are open.

•	All brake lamp grounds are open.

•	An open or high resistance in the EBCM ground

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

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 Verification

Apply and release brake pedal. Verify brake lamps operate properly.

⇒	If brake lamps do not operate properly, refer to Symptoms - Lighting .