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 170 (COMPUTER/INTEGRATING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1380CIRCUIT/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.
- With the ignition in OFF, disconnect the BCM.
- With the ignition in OFF and START, measure for less than 0 volts between the accessory voltage circuit of the BCM connector and ground.
- If over 0 volts, disconnect the ignition switch and check the accessory voltage circuit for short to voltage or short to other ignition switch signal circuit. If the circuit tests normal, test or replace the ignition switch.
- With the ignition in ACC and RUN, measure for battery voltage between the accessory voltage circuit of the BCM connector and ground.
- If less than battery voltage, disconnect the ignition switch and check the accessory voltage and battery positive voltage circuits for an open or short to ground. If the circuits test normal, test or replace the ignition switch.
- If all circuits test normal, replace the BCM.
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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.