• | 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 |
---|---|---|---|---|
Brake Signal | C0297 00 | -- | -- | -- |
The body control module (BCM) applies a ground through the brake pedal position sensor low reference circuit to the brake pedal position sensor (BPP). The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the BPP. When the brake pedal is being applied, the BPP then sends a variable voltage through the brake sensor signal circuit to the BCM. The BCM then applies a signal to the brake signal circuit to the engine control module (ECM) and transmission control module (TCM).
The ignition is ON.
The BCM detects a short to ground on the brake signal circuit.
The ECM and TCM will not function correctly.
The BCM clears these codes from current when the fault is removed from the system.
Lighting Systems Connector End Views
Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.
⇒ | If greater than the specified range, test the brake signal circuit for a short to ground. If the circuit/connections test normal, replace the BCM. |
⇒ | If greater than the specified range, replace the TCM |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM, TCM and ECM replacement, setup and programming |