Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 173 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0297CIRCUIT/SYSTEM TESTING
2006 Buick Terraza CXL, 3.5 L, AWD
Circuit/System Testing
2006 Buick Terraza CXL, 3.5 L, AWDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the TCM and the (C1) harness connector at the ECM.
- Connect a test lamp between the signal circuit terminal 42 of the TCM 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 harness connector at the TCM.
- If all circuits test normal, replace the headlamp switch.
- With LS4 -- terminal 7
- With LZE, LZ4, or LZ8 -- terminal 9
- 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 an open/high resistance. If the circuit tests normal, replace the TCM.
- If all circuits test normal, replace the ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.