More of a function of the interface used as that piece provides 12v switched power through a relay. The power to that relay is cut when onstar/phone is used unless the interface has a mute wire which can be used instead (there is a brown wire in a loop that must be cut if I remember correctly).
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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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