Unlock all doors, foot on brake, all doors closed. Cycle key quickly but carefully on-off approximately 10 times until the car honks one time.
(Do not turn the key far enough to start the car, just to the 'on' position so the dashboard lights up.)
When the horn honks, open and close the driver's door, press any remote button and that's it.
******To program another remote, Quickly open and close the driver's door again and push a button on the 2nd remote. That's it.
When you're done, remove the key and the horn should honk 3 times. You're all set.
Sometime it takes more than 10 on-offs to set program mode. Open/close the door, lock/unlock etc, wait 10 minutes, then try again.