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 B1440CIRCUIT/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 OFF, disconnect the BCM connector.
- With the ignition OFF w/key out and in the ACC positions, measure for 0 volts between the off/run/crank voltage circuit at the BCM connector and ground.
- If over 0 volts, disconnect the ignition switch and check the off/run/crank voltage circuit for short to voltage or short to other ignition switch signal circuit.
- With the ignition OFF w/key in, measure for battery voltage between the off/run/crank voltage circuit at the BCM connector and ground.
- If less than battery voltage, disconnect the ignition switch and check the off/run/crank voltage circuit for an open or short to ground.
- With the ignition in the RUN and START positions, measure for battery voltage between the ignition 1 voltage circuit at the BCM connector and ground.
- If less than battery voltage, disconnect the ignition switch and check the ignition 1 voltage and battery positive voltage circuits for an open or short to ground.
- With the ignition in the ACC and RUN positions, measure for battery voltage between the accessory voltage circuit at the BCM connector and ground.
- If less than battery voltage, disconnect the ignition switch and check the ignition voltage and battery positive voltage circuits for an open or short to ground.
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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.