C0297

DTC C0297

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0297 00
- Brake Applied Output Circuit

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) provides a 5-volt reference voltage and a low reference signal to the brake pedal position sensor (BPPS). When the brake pedal is applied, the BPPS sends a variable voltage signal, that will increase as the brake pedal is applied, through the stop lamp switch signal circuit to the BCM. The BCM then applies a signal through the stop lamp switch signal circuit to the engine control module (ECM) and transmission control module (TCM).

Conditions for Running the DTC

* The engine must be ON.
* The brake must be applied.

Conditions for Setting the DTC

The BCM detects a short to ground in the stop lamp switch signal circuit to the ECM and TCM.

Action Taken When the DTC Sets

* The BCM stores the DTC to memory.
* The Service Vehicle Soon indicator is commanded ON.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Circuit/System Verification

Ignition ON, observe the scan tool Brake Applied Output Signal parameter. The reading should be On, with the brakes applied.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the TCM and the X1 harness connector at the ECM.
2. Connect a test lamp between the signal circuit terminal 42 of the TCM and ground.
3. Engine ON, press and release the brake pedal. The test lamp should turn ON and OFF when pressing and releasing the brake pedal.

^ If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit test normal, replace the BCM.
^ If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the BCM.

4. Ignition OFF, connect the harness connector at the TCM.
5. Connect a test lamp between the appropriate signal circuit terminal of the ECM and ground.

* With LS4 - terminal 7
* With LZE, LZ4, or LZ8 - terminal 9

6. Engine ON, press and release the brake pedal. The test lamp should turn ON and OFF when pressing and releasing the brake pedal.

^ If the test lamp is always OFF, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the TCM.

7. If all circuits test normal, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests