Using Scan Tool
WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Procedure is written for TECH 2 scan tool, equivalent scan tool may also be used to program transmitters. Connect scan tool to vehicle. Turn ignition on. At application menu, select F0 (BODY CONTROL MODULE). At BCM screen, select F2 (SPECIAL FUNCTIONS). At special functions menu, select F3 (PROGRAM KEY FOBS). Follow scan tool on-screen instructions to program transmitters. To exit programming, press EXIT until application menu is displayed. Disconnect scan tool and check operation of transmitters.