C0161

DTC C0161

Circuit Description
The electronic brake control module (EBCM) receives battery positive voltage on the stop lamp switch circuit when the brake pedal is applied. The EBCM uses the signal from the stop lamp switch signal to enhance the antilock braking system.

DTC Descriptor





This diagnostic procedure supports the following DTC:
DTC C0161 ABS/TCS Brake Switch Circuit
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description.

Conditions for Running the DTC

C0161 04
^ The ignition is ON.
^ The ignition voltage is greater than 8 volts.

C0161 11
^ The ignition is ON.
^ The vehicle speed is greater than 16 km/h (10 mph).
^ The ignition voltage is greater than 8 volts.

C0161 12
^ The ignition is ON.
^ The ignition voltage is greater than 8 volts.

Conditions for Setting the DTC

C0161 04
The EBCM detects an open in the brake switch signal circuit.

C0161 11
^ The brake pedal is sensed as applied.
^ The vehicle speed is greater than 40 km/h (25 mph).
^ The vehicles acceleration exceeds 8 km/h per second (5 mph per second).

C0161 12
^ Brake pedal is not applied.
^ Traction Control is not active.
^ The vehicle has reached speed greater than 24 km/h (14 mph).
^ The vehicles deceleration exceeds 11.5 km/h per second (7 mph per second).
^ Conditions for setting the DTC occur 3 times.

Action Taken When the DTC Sets
No systems are disabled and no warning indicators or messages will appear.

Diagnostic Aids
The DTC C0161.11 can be set if the vehicle has been driven with the brake applied during acceleration. Inspect for a poor or intermittent connection, refer to Testing for Intermittent Conditions and Poor Connections. Diagnostic Aids

Test Description





The numbers below refer to the step numbers on the diagnostic table.
2. The EBCM sources 5 volts on the stop lamp switch signal circuit. This small voltage has a ground path through the stop lamp bulbs. This DTC sets if the stop lamp ground is open or all stop lamp bulbs are open.
4. This DTC detects an open stop lamp switch signal circuit from the stop lamp side of the splice pack to the EBCM.