Programming Remotes from 1997 to 2005 Century

1997 to 1999 Buick Century

1 Sit in the driver's seat.
2 Remove the ignition key from the ignition lock cylinder.
3 Close all vehicle doors.
4 Press and hold unlock on the door lock switch.
5 While holding the door lock switch in the unlock position, insert and remove the ignition key twice. Do not rotate the ignition lock cylinder.
Insert the ignition key a third time leaving the key in the ignition lock cylinder. The ignition must remain in the LOCK position for the rest of the procedure.
6 Release the door lock switch. You will hear three chimes. This chime feedback indicates that transmitter programming is active.
7 Press and hold the lock and unlock buttons at the same time on the keyless entry transmitter for 12 seconds. You will hear two chimes. This chime feedback indicates that the transmitter has been programmed successfully.
8 Repeat step 8 for the rest of the transmitters (for a total of 4 transmitters).
9 Exit this procedure by removing the ignition key from the ignition lock cylinder.


2000 to 2005 Buick Century

Requires the use of a scan tool.


200 to 2005 alt method.
Use the listed method for 1997 to 1999. I haven't tried this on all models and years since I have a scanner next to me and it is much quicker for me to do it that way but other members here have used the first method to do 1997 to 2005.