PRE-RELEASE
DTC C0297
| DTC C0297 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC C0297 02
Brake Applied Output Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Cruise/ETC/TCC Brake Signal | C0297 02, P0572 | P0572 | P0573 | - |
| Circuit/System Description |
The stop lamp switch signal circuit is a B+ input from the body control module (BCM) to the engine control module (ECM). The ECM monitors the stop lamp switch circuit to detect when the brake pedal has been applied. The BCM monitors the brake pedal position sensor to determine when the brake pedal is applied. When the brake pedal is applied, the BCM supplies 12V on the stop lamp switch signal circuit and also sends a serial data message to the ECM indicating that the brake pedal has been applied.
| Conditions for Setting the DTC |
The BCM detects a short to ground on the cruise/ETC/TCC brake signal circuit.
| Action Taken When the DTC Sets |
The cruise control system is disabled
| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| Reference Information |
Schematic Reference
Cruise Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the X1 (LF1) or X2 (LAU) harness connector at the K20 ECM.
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Connect a test lamp between the signal circuit terminal listed below and ground:
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Terminal 57 (LF1)
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Terminal 52 (LAU)
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Ignition ON, observe the function of the test lamp while pressing and releasing the brake pedal. The test lamp should turn ON when the brake pedal is pressed and turn OFF when the brake pedal is released.
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If the test lamp is always ON, test the signal circuit for a short to voltage.
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If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance.
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If all circuits test normal, replace the K9 BCM.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
