C0161

DTC C0161

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptor
DTC C0161 00
- Antilock Brake System (ABS) Brake Switch Circuit not Plausible

Circuit/System Description

The body control module (BCM) supplies B+ to the stoplamp switch, when the pedal is pressed, the electronic brake control module (EBCM) receives an input that the brake pedal is applied.

Conditions for Running the DTC

* Ignition ON.
* The vehicle speed is greater than 16 km/h (10 mph).
* The ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

* The vehicle speed is greater than 40 km/h (25 mph) and then slow down to less than 3 km/h (2 mph) 4 times and the brake pedal signal does not show any change in state.
* The vehicle speed is greater than 20 km/h (12 mph) and the brake pedal signal indicates an active state for continuously more than 6 minutes.
* The brake light switch signal coming from the module send invalid data to the EBCM in terms of the rolling count value.

Action Taken When the DTC Sets

* The ABS/TCS remains functional
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

The DTC C0161 00 can be set if the vehicle has been driven with the brake applied during acceleration.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Non 2 Mode Hybrid) (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation Reference

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)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 (- Symptoms - Lighting).

Repair Instructions

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