Well, I could be wrong, but Y91 is the gm code for Bose Luxury option. If he is trying to put a non bose luxury nav radio in then it might not work. Might also need to have the correct vehicle system data downloaded into the nav via tech II.
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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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