http://www.wikihow.com/Program-GM-Keyless-Remotes
This is how to program GM keyless remotes. (NOTE - The GM dealer will charge $40.00 to do this 1 minute task - what a rip!)
1
- Close all the vehicle doors.
- Insert the ignition key into the ignition lock cylinder - do not turn ignition switch.
- 3Press and hold the DOOR unlock switch (This is the switch on the door, NOT the remote).
- 4While holding the DOOR lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF, ON, OFF.
- 5Release the DOOR unlock switch. The doors will lock and unlock one time to confirm the program mode is activated.
- 6Simultaneously press and hold the LOCK button and the UNLOCK button on one keyless remote for approximately 15 seconds, the doors will lock and unlock to confirm the programming of that transmitter.
- 7Repeat the previous step to program up to four transmitters.
- 8Turn the ignition switch to the ON (one more click forward) position in order to exit the keyless entry transmitter mode.
- 9Operate the transmitter functions in order to verify correct system operation.