Diagnostic Instructions
DTC Descriptor
DTC C0297 00: Brake Applied Output Circuit
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Brake Signal
| C0297 00
| --
| --
| --
|
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 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
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the control modules for the appropriate engine RPO listed below.
- Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
- 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. |
- Ignition OFF, connect the at the appropriate TAC or TCM control module.
- Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
• | L26 - PCM terminal 32 C1 |
• | LD8 - ECM terminal 77 C1 |
- 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. |
- If all circuit tests normal, replace the appropriate PCM or ECM control module.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.