C0297
DTC C0297
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
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.
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.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
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 control modules for the appropriate engine RPO listed below.
* PCM X1 and TAC (with L26/3.8L)
* ECM X1 and TCM (with LD8)
2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
* TAC terminal 6 (with L26/3.8L)
* TCM terminal 42 (with LD8)
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 at the appropriate TAC or TCM control module.
5. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
* PCM terminal 32 X1 (with L26/3.8L)
* ECM terminal 77 X1 (with LD8)
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 a short to ground or an open/high resistance. If the circuit test normal, replace the appropriate TAC or TCM.
7. If all circuit tests normal, replace the appropriate PCM or ECM control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Brake Pedal Position Sensor Replacement (Brake Pedal Position Sensor Replacement)
* Control Module References (Programming and Relearning) for BCM, PCM, ECM, TCM and TAC replacement, setup and programming