Diagnostic Instructions
DTC Descriptor
DTC C0161 00: Antilock Brake System (ABS) Brake Switch/Sensor Circuit not Plausible
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 instrument panel module (IPM) 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 9.5 volts. |
Conditions for Setting the DTC
| • | The vehicle speed is greater than 40 km/h (25 mph) and then slow down to less than 3 Km/h (2 mph) 4 times and the brake pedal signal does not show any change in state. |
| • | The vehicle speed is greater than 20 km/h (12 mph) and the brake pedal signal indicates an active state for continuously more than 6 minutes. |
| • | The brake light switch signal coming from the module send invalid data to the EBCM in terms of the rolling count value. |
Action Taken When the DTC Sets
The ABS/TCS/ESC remains functional.
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically 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
Antilock Brake System Connector End Views
Description and Operation Reference
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
for EBCM
Circuit/System Verification
With the ignition ON, use a scan tool to display DTCs for the BCM.
| ⇒ | If no DTCs are present, go to Diagnostic Aids. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
