C0161
DTC C0161
Circuit Description
The brake switch informs the electronic brake control module (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 torque converter clutch (TCC) brake switch signal circuit is 0 volts.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0161 Antilock Brake System (ABS)/Traction Control System (TCS) Brake Switch
Conditions for Running the DTC
Any of the following conditions may cause the diagnostic trouble code (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.
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.
Action Taken When the DTC Sets
The EBCM stores this information-only DTC for as long as the condition is present.
Conditions for Clearing the DTC
The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTC's 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.
