so you can use this when installing an aftermarket in-dash CD player or GPS navigation radio some vehicle models. YOU WILL REQIURE THIS INTERFACE MODULE to maintain full functionallity of the vehicles original factory options and features. Examples would be steering wheel mounted radio controls, premium sound systems (BOSE, JBL, Rockford, Infinity, Monsoon,etc.), Sync, OnStar, CAN-Bus systems, LAN systems, door chimes, audible turn signal indicators and reverse sensing systems. Depending on vehicle model will work on OnStar® Interface for Class 2 vehicles (thru 2006) with Bose® sound systems
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