[H2bill]

Originally Posted by aggiehummer...er

You'll need to reprogram both remotes, so make sure both are with you.

Put the key in the ignition and don't turn the car on. While holding the unlock button down on the driver door, turn the key on and off twice (without turning the car on, turn it to the on position and then to the off position). You should hear the horn honk really quick and the door locks will cycle, this means the car is in program mode. Take the first key fob and hold down the lock AND unlock buttons. After between 6-20 seconds, the locks will cycle, that means it's accepted the programming. Repeat with second key fob. After the second key fob, turn the key on and off, you'll hear another honk, which means it's out of program mode.

Test remotes, and you're good to go.

This is only for the H2/Tahoe/Escalade, not the H3.

How in the world did you figure that out?