For 1990-2009 cars only
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 00: Antilock Brake System (ABS) Brake Switch Circuit not PlausibleCircuit/System Description
The body control module (BCM) supplies B+ to the stoplamp switch, when the pedal is pressed, the electronic brake control module (EBCM) receives an input that the brake pedal is applied.
Conditions for Running the DTC
| • | Ignition ON. |
| • | The vehicle speed is greater than 16 km/h (10 mph). |
| • | The ignition voltage is greater than 10 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 remains functional |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the 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
Description and Operation Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Apply and release brake pedal. Verify brake lamps operate properly.
| ⇒ | If brake lamps do not operate properly, refer to Symptoms - Lighting. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
