Diagnostic Instructions
DTC Descriptor
DTC C0161 00: TCS Brake Switch Circuit
Circuit/System Description
The brake pedal position (BPP) sensor is an input to the body control module (BCM). The BCM then sends a serial data message to the electronic brake control module (EBCM) and other electronic control modules. The BPP sensor is a potentiometer type sensor
with a 5-volt reference circuit and a low reference circuit. The BCM supplies the 5-volt reference to the BPP.
Conditions for Running the DTC
| • | The vehicle speed is greater than 16 km/h (10 mph). |
| • | The ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
| • | The brake pedal is sensed as applied during moderate to high vehicle acceleration. |
| • | With the vehicle decelerating, the brake pedal is sensed as released and the master cylinder pressure is greater than 90 psi. |
Action Taken When the DTC Sets
| • | The EBCM disables the traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The Traction Control indicator illuminates. |
| • | The driver information center (DIC) displays Service Stability System. |
| • | The ABS remains functional. |
Conditions for Clearing the MIL/DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
The DTC C0161 00 can be set if the vehicle has been driven with the brake applied during acceleration.
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
- Verify that DTC C0277, C0297, or B3445 is not set.
- Ignition ON, observe the scan tool EBCM BPP parameter while applying and releasing the brake pedal. The reading should change between Applied and Released.
| ⇒ | If the parameter does not change between applied and release, replace the BPMV and verify DTC does not reset. If DTC reset, replace the EBCM. |
Repair Instructions
Perform the
Diagnostic Repair Verificationafter completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
