PAC OS-5 Radio Replacement Interface w/ OnStar Retention for Select GM VehiclesBRAND NEW PAC OS 5 Car Radio Replacement Interface for Select GM Vehicles with OnStar and GM LAN 29 Bit Data bus Key Features: Replacement interface for select GM Vehicles with OnStar, Bose, and GM LAN Data Bus Compatible with or without factory amplified audio system1 Can be used if the vehicle does not have OnStar Compatible with or without Bose systems Provides 12 Volt RAP Output wire Retains the 5. 1 Digital audio system in select GM Vehicles