C0297

DTC C0297

DTC Descriptor
DTC C0297 00
- Brake Applied Output Circuit

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The body control module (BCM) applies a ground through the brake pedal position sensor (BPPS) low reference circuit to the BPPS. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the BPPS. When the brake pedal is being applied, the BPPS 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).

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the brake signal circuit.

Action Taken When the DTC Sets

The ECM and TCM will not function correctly.

Conditions for Clearing the DTC

The BCM clears these codes from current when the fault is removed from the system.

Circuit/System Verification

Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the ECM and TCM.
2. Connect a DMM at the ECM, between the brake signal circuit and the positive terminal of the battery.
3. Ignition ON, test for less than 0.1 volt.

• If greater than 0.1 volt, test the brake signal circuit for a short to ground. If the circuit/connections test normal, replace the BCM.

4. Leave the DMM connected. Connect the TCM harness connector.
5. Ignition ON, test for less than 0.1 volt.

• If greater than 0.1 volt, replace the TCM.

6. If the voltage is correct and all circuits/connections test normal, replace the ECM.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for BCM, TCM and ECM replacement, setup and programming Programming and Relearning