f5stop would probably know this better than I, but I believe that gm has not yet implemented much on the can bus. On some of their 05-06 sedan models they use what they call a lan bus system.
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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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