[aleekat]

Try this method: (I think you have 98-99 instructions)
Transmitter Programming Procedure (Method 1 - No Tools Required)
Close the vehicle doors.
Turn OFF the ignition.
Remove the ignition key from the ignition lock cylinder.
Press and hold the driver side door lock switch to the unlock position.
Insert the ignition key into the ignition lock cylinder and remove the key. (Do not turn the ignition key in the lock cylinder.)
Insert the ignition key into the ignition lock cylinder and remove the key. (Do not turn the ignition key in the lock cylinder.)
Insert the ignition key into the ignition lock cylinder. (Do not turn the ignition key in the lock cylinder.) Leave the ignition key in the ignition lock cylinder.
Release the door lock switch. The body control module (BCM) will sound three chimes in order to verify the Program Mode has been activated.
Press the lock and unlock buttons on the keyless entry transmitter simultaneously for approximately 15 seconds. The BCM will sound three chimes in order to verify that the transmitter has been successfully programmed.
Perform the previous step to program up to four transmitters.
Remove the ignition key in order to exit the Program Mode.
Verify the proper operation of each transmitter.

Tech II-FYI got a 2007 buick rendezvous and was pleasantly surprise that I could program extra key fobs without a scan tool.