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Radio Replacement Interface with OnStar Retention by PAC®. For Select 29-bit LAN General Motors Vehicles with or without a Bose Sound System - Complete Retention of the Vehicle's Factory Options. Retains OnStar™ system functionality and the Bose factory-installed amplifier (if present) when the factory radio is replaced in a 29-bit GMLAN vehicle. Generates all safety warning chimes and audible turn signal indicators.