How program the keyless remote for 2005 Buick Lacrosse with autostart?

To program the keyless remote for a 2005 Buick Lacrosse with autostart, follow these steps: First, 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. Press and hold the "Lock" and "Unlock" buttons on the remote simultaneously for about 15 seconds, then release them. Finally, turn the ignition off to complete the programming process. If successful, the doors should lock and unlock to confirm that the remote is programmed.