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.
1997 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
DTC B2735, Pass-Key(R) Programming Mode Active: Testing
- If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK .
- Perform BCM programming procedure for PASS-Key(R) II system. See THEFT DETERRENT RELEARN under BCM PROGRAMMING. Go to next step.
- Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Check for DTCs. If DTC B2735 sets again, go to next step. If DTC B2735 does not set again, system is operating properly.
- Using scan tool, check for PASS-Key(R) II DTCs B2722 or B2723. If either of these DTCs are present, go to appropriate DTC test. If these DTCs are not present, go to next step.
- Turn ignition off. Replace BCM. See REMOVAL & INSTALLATION . Reprogram BCM. See BCM PROGRAMMING. Go to next step.
- Turn ignition off. Reinstall all components and connectors. Turn ignition on. Using scan tool, clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK .
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.
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