Location of body contol senser on a 97buick century limited

Do you Body Control Module ? It's below left side of instrument panel . What type of problem are you having ? You can not change a BCM for another one
Important:

• Read the BCM set-up procedures carefully and completely.

• The BCM will not function properly if the Setup New BCM Procedure is not performed.

• Perform the Theft Deterrent Re-Learn procedure after successfully finishing the Setup New BCM Procedure. If the Theft Deterrent Re-Learn procedure is not performed after a BCM replacement, the following conditions may occur:

- The vehicle will not be protected against theft by the PASS-Key® II system.

- The engine will not start !!!!!!