Please keep in mind I've never tried this, I ran across these instructions some time back and saved them for when/if I ever needed them.
You need either the GM magnet tool J41760 or a fairly strong horseshoe style magnet since most shop-style nuts/bolts pick-up magents will not be strong enough.
1) Key in ignition in on position
2) Press lock and un-lock buttons on the fob till the horn chirps
3) Starting with Left Front tire hold magnet against valve stem until horn chirps then work your way around vehicle clockwise. After the Left rear tire horn will chirp twice to indicate that programming is complete.
You need either the GM magnet tool J41760 or a fairly strong horseshoe style magnet since most shop-style nuts/bolts pick-up magents will not be strong enough.
1) Key in ignition in on position
2) Press lock and un-lock buttons on the fob till the horn chirps
3) Starting with Left Front tire hold magnet against valve stem until horn chirps then work your way around vehicle clockwise. After the Left rear tire horn will chirp twice to indicate that programming is complete.