DTC C0161
Diagnostic Instructions
DTC Descriptor
DTC C0161 5A: Antilock Brake System Brake Switch Circuit
Circuit/System Description
The electronic brake control module (EBCM) detects the brake signal inputs from the brake switch and calculates the vehicle speed from the 4 wheel speed sensors. When the vehicle is stopping the EBCM monitors for the brake pedal is pressed, with the brake pressure increasing and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is not pressed and brake pressure is not increasing.
Conditions for Running the DTC
| • | Ignition voltage is greater than 8.0 volts. |
Conditions for Setting the DTC
| • | The vehicle speed is not reducing, the brake pressure is not increasing, when the brake pedal is detected as applied. |
| • | The vehicle speed is reducing, the brake pressure is increasing, when the brake pedal is not detected as applied. |
Action Taken When the DTC Sets
A warning indicator on the information display module may be displayed.
Conditions for Clearing the DTC
| • | The conditions for setting the DTC are no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool EBCM brake switch signal parameter. The reading should be released and change between applied and released when pressing and releasing the brake pedal.
| ⇒ | If not within the specified value, check the brake switch diagnostic. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Refer to Control Module References for EBCM replacement, setup, and programming.
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