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^ I ran into this problem... You can't go aftermarket as the OEM touch screen has all the controls for climate, heated/cooled seats, radio, bluetooth etc.
I was hoping it would be just a case of adding some small hardware and software upgrades. But hey, that would be too easy.
It would be Nice if they did! As my 2007 Hummer H3 had every option except Nav. Radio, bought a new oem unit on ebay! The Nav. radio cost me $650 and came with the antenna (took less than a hr to install)! Whole thing was plug n play, only required pulling negative terminal on battery!
No dealer flash or anything, best part I saved $1400 over getting it new when I first bought the suv! Splash screen even said Hummer H3 when I started the suv, just like it would from the factory...
I also really miss that Monsoon stereo it came with, with a 10" factory sub... Everyone thought it was a Aftermarket stereo...