C0161

DTC C0161

Test 1-4:

Test 5-12:

Circuit Description
The brake switch informs the EBCM when the brake is depressed. The brake switch is normally closed, supplying 12 volts to the EBCM when the brake is released. When the brake pedal is pressed, voltage on the TCC brake switch signal circuit is 0 volts.

Conditions for Running the DTC
Any of the following conditions may cause the DTC to run.
^ The vehicle accelerates from 0 km/h (0 mph) to a speed greater than 56 km/h (35 mph).
^ The vehicle experiences an ABS event involving all hydraulic circuits.
^ The EBCM detects that the master cylinder pressure is greater than 1400 kPa (200 PSI) and that the vehicle is decelerating.

Conditions for Setting the DTC
Any of the following conditions may cause the DTC to set.
^ Voltage on the TCC brake switch signal circuit is always low.
^ Voltage on the TCC brake switch signal circuit is always high.
^ Voltage on the TCC brake switch signal circuit is high for 0.5-4.0 seconds when voltage is expected to be low.

Action Taken When the DTC Sets
^ The EBCM disables the VSES.
^ The TCS operates with engine torque reduction capability only.
^ The message center displays the service stability system message.

Conditions for Clearing the DTC
The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests for a shorted stop lamp switch.
5. This step tests for an open stop lamp switch.