• | 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) 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).
• | The engine must be ON. |
• | The brake must be applied. |
The BCM detects a short to ground in the stop lamp switch signal circuit.
• | The BCM stores the DTC to memory. |
• | The Service Vehicle Soon indicator is commanded ON. |
A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
Ignition ON, press and release the brake pedal. The stop lamps should illuminate then go out.
⇒ | 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. |
⇒ | 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 TCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM, ECM, and TCM replacement, setup, and programming