Humm this, I think you pretty much answered your own question--just use the N2 as a nav display and dvd player. Don't hook up any of its outputs other than av out 1 on the N2. Keep in mind that the on star location is pretty low so you will have to look down a bit while driving to see, and when the screen is out you will block some of the heat controls. Probably not huge issues but definitely worth thinking about. I actually removed my onstar and put a sound control/processor unit there and it worked out great.
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\'05 Slate Blue Sut w/ Magnusun, JBA headers, custom exhaust, 22\" MC2 RT5 wheels, Pioneer AVIC Z1 nav, Passport SRX, Vizualogic A1000 dual, bi xenons, fog xenons, dual optimas, and just gettin\' started!
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