Installing the 2004 GM DVD Navigation System in a 2003 Hummer H2

[Pbuilder]

I jus t bought the addon 6 disk changer that going in the escolade and tring to find a XM box from a juck yard to do it. the problem is that it will lock up when installed in another truck. the docs I have says it has to be replaced if that happens because the dealer are not able to unlock the xm boxes.
not sure if they will do a warrenty exchange on it or not if that is what happens.
I am going to find out one of these days.