GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC C0297

Diagnostic Instructions
    • 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.

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 Applied Signal

C0297 00

1

1

--

1. Cruise Control Malfunction

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
    • Battery voltage must be between 9-16 volts.
    • Brakes APPLIED.

Conditions for Setting the DTC

DTC C0297 00 will set when the BCM detects a short to ground in the brake applied 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

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connectors at the appropriate control modules listed below.
    2. • PCM X1 and TAC - with L26
    • ECM X1 and TCM - with LD8
  2. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    3. • TAC terminal 6 - with L26
    • TCM terminal 42 - with LD8
  3. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    4. ⇒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 connectors at the appropriate TAC or TCM control module.
  5. Connect a test lamp between the appropriate signal circuit terminal listed below and ground.
    6. • PCM terminal 32 X1 - with L26
    • ECM terminal 77 X1 - with LD8
  6. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    7. ⇒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 after completing the diagnostic procedure.

    •  Brake Pedal Position Sensor Replacement
    •  Control Module References for BCM, PCM, ECM, TCM and TAC replacement, setup and programming