How do you program a keyless remote for Buick 2006 Lucerne?

To program a keyless remote for a 2006 Buick Lucerne, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position without starting the engine, then turn it back to "Off" and remove the key. Repeat this process twice, then insert the key again and turn it to "On." Press and hold the "Lock" and "Unlock" buttons on the remote simultaneously for about 15 seconds until the doors lock and unlock, confirming successful programming.