• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5 V Reference | C0277 06 | C0277 06 | -- | -- |
Signal | C0277 06 | C0277 06 | C0277 07 | C0277 09 |
Low Reference | -- | C0277 06 | -- | -- |
The body control module (BCM) monitors the brake pedal position sensor and sends a serial data message when the brake pedal is applied. When the vehicle is stopping, the electronic brake control module (EBCM) monitors for the brake pedal applied serial data message from the BCM, with the brake pressure increasing and the vehicle slowing down, or when the vehicle is accelerating, the brake pedal is not applied and brake pressure is not increasing.
• | Ignition ON. |
• | DTC C0131 is not present. |
• | The EBCM detects brake pedal is not applied and the brake pressure is greater 15 bar (218 PSI) for 2 s. |
• | The EBCM detects the vehicle speed is greater than 16 km/h (10 MPH), the brake pedal is applied for 122 s, and brake pressure is less than 6.2 bar (90 PSI). |
The EBCM disables the hill start assist for the duration of the ignition cycle.
• | A current DTC clears when the diagnostic runs and passes. |
• | The EBCM will turn OFF the indicator in the next ignition cycle. |
The DTC C0161 5A can be set if the brake pedal is applied while accelerating or the brake pedal position sensor is out of adjustment.
Antilock Brake System Schematics
Control Module References for scan tool information
⇒ | If DTC C0277 is present, refer to LINK to diagnose that DTC prior to this diagnostic. |
⇒ | If the stop lamps do not operate properly, refer to Symptoms - Lighting |
⇒ | If the DTC resets replace the K9 Body Control Module (BCM). |
• | Perform the Diagnostic Repair Verification after completing the diagnostic procedure. |
• | Control Module References for control module replacement, setup and programming |