C0161

DTC C0161





Circuit Description
The electronic brake control module (EBCM) monitors brake pedal position through the stop lamp switch. The stop lamp switch is closed when the brake pedal is pressed and the stop lamp switch opens when the brake pedal is released. When the stop lamp switch is closed, the EBCM receives a voltage signal from the stop lamp switch.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0161 Brake Switch Circuit Malfunction

Conditions for Running the DTC
DTC C0161 can be set anytime the ignition switch is ON.

Conditions for Setting the DTC
The EBCM detects an open, high resistance or short to ground in the stop lamp switch signal circuit.

Action Taken When the DTC Sets
^ The EBCM stores this information only for as long as the condition is present.
^ The ABS/TCS remains functional.

Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
^ Misadjusted stop lamp switch
^ Faulty stop lamp switch
^ Open, high resistance or short to ground in the stop lamp switch signal circuit
^ An internal EBCM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.

Test Description
The number below refers to the step number on the diagnostic table.
5. This step test the EBCM stop lamp signal circuit for an open, high resistance or short to ground.