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.
2001 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Determining BCM Programed Key Code
- Connect VATS Interrogator and adapter to BCM side of White 2-pin ignition lock cylinder harness connector at base of steering column. DO NOT connect to steering column side of harness connector. Go to next step.
- Turn VATS Interrogator on. Move key code switch to "1" position and attempt to start engine. If engine starts, key code is "1". If engine does not start, go to next step.
- Turn ignition switch to LOCK position and press 4-minute timer on VATS Interrogator. When timer indicator goes out, move key code switch to next number and attempt to start engine. If engine does not start, repeat this step until proper key code is found. A total of 15 different ignition key resistance values are available.
Factory Service Tools
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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.