Klaus rrrrealy helped me out here!
I was stuck with a non-functioning # 1 keyless entry remote fob.
The local GMC dealer is still waiting for the software upgrade for the scan tool (the handheld car-computer interogator) to do the programming in the Hummer H2.
But thanks to H2 club-forum in general and this technical document post in particular I taught the Hummer to recognize the other remote fob.
At 1st I was worried about the security issue, but you need to use your ignition key and be inside the car to do it, so it was a snitch!
Now the spouse finaly can also make use of the memory feature of chair, mirrors, radio-channels, AC etc. thanks to H2 4X4!
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