Just so you know, I called Delphi about this. They are not interested in helping in any way.
The Hummer Area Rep was at my dealer recently, and he said that the wiring was different on the '04s, and that GM had no plans to work on a retrofit.
I'm sure GM *could* do this if they wanted, but it would require some custom programming.
IMO, the only thing that *might* work would be to add a 6 disc changer to an '04.
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."
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