DTC C0161 Under 8600 GVW
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0161: Antilock Brake System (ABS) Brake Switch/Sensor Circuit Not PlausibleCircuit/System Description
The body control module (BCM) illuminates the stop lamps by applying battery positive voltage to the stop lamp supply voltage circuit. The electronic brake control module (EBCM) receives a voltage input from the stop lamp supply voltage circuit to determine if the brake pedal is applied.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | 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 brake pedal is sensed as applied for 60 seconds. |
| • | The vehicle speed is greater than 21 km/h (13 mph). |
Action Taken When the DTC Sets
| • | The Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) if equipped, remains functional. |
| • | The stability indicator illuminates. |
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 can be set if the vehicle has been driven with the brake applied during acceleration. Also inspect the brake pedal switch and connector for proper operation.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
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 B codes are present, Refer to Diagnostic System Check - Vehicle . |
| ⇒ | If no DTCs are present, go to Diagnostic Aids. |
Circuit/System Testing
Apply and release brake pedal. Verify brake lamps operate properly. If brake lamps do not operate properly, review brake pedal switch diagnostics in lighting. Refer to Symptoms - Lighting .
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
