C0161

DTC C0161

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 C0161 5A

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Antilock Braking System Brake Switch Circuit Not Plausible

Circuit/System Description

The body control module monitors the brake pedal position sensor signal circuit when the brake pedal is applied and sends a serial data message to the electronic brake control module indicating the brake pedal position. The electronic brake control module compares the brake pressure sensor signal to the brake pedal position and uses this information for vehicle stability control.

Conditions for Running the DTC

* Ignition ON.

* Ignition voltage is greater than 8.0 V.

Conditions for Setting the DTC

* Brake pressure signal does not correlate to estimated pressure over time.

* Brake pedal position signal does not correlate to brake pressure signal.

* Signal is erratic and changes faster than physically allowed.

Action Taken When the DTC Sets

* The electronic brake control module disables the traction control system and electronic stability control system for the duration of the ignition cycle, and the ABS remains functional.

* The traction/stability control indicator turns ON, if equipped with electronic stability control.

Conditions for Clearing the DTC

* Conditions for Clearing the DTC

* The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

Reference Information

Schematic Reference

* Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

* Exterior Lights Schematics Exterior Lights Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

ABS Description and Operation Description and Operation

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

Note:
Diagnose all other stop lamp DTCs or Symptoms prior to performing this diagnostic procedure.

1. Ignition ON.

2. Verify the stop lamps turn ON and OFF while applying and releasing the brake pedal.

• If the stop lamps do not turn ON and OFF

Refer to Symptoms - Lighting Symptoms - Lighting.

• If the stop lamps turn ON and OFF

3. Ignition ON.

4. Verify the scan tool Brake Pedal Position Sensor parameter changes between Active and Inactive while applying and releasing the brake pedal.

• If the parameter does not change

Replace the K17 electronic brake control module.

• If the parameter changes

5. All OK.

Repair Instructions

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

Control Module References Programming and Relearning for electronic brake control module replacement, programming and setup