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 B2615CIRCUIT/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 (C4) harness connector at the BCM.
- Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the supply voltage circuits listed below for a short to ground.
- Courtesy lamp supply voltage terminal 5 C2
- Courtesy lamp supply voltage terminal 1 C6
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the supply voltage circuits listed below for a short to ground.
- Ignition OFF, connect the (C4) harness connector at the BCM.
- Disconnect the harness connectors at all components fed by the courtesy lamp supply voltage circuits listed below.
- Courtesy lamp supply voltage terminal 5 C2
- Courtesy lamp supply voltage terminal 1 C6
- Ignition ON, clear the DTC with a scan tool.
- Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
- If the DTC resets, test the supply voltage circuits for a short to ground. If the circuits test normal, replace the BCM.
- Reconnect each component one at a time and verify that the DTC does not reset.
- If the DTC resets, test or replace the component responsible for setting the DTC.
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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.