PAC OS2-GM32 OnStar Radio Replacement Interface for Select Cadillac Vehicles Replacement interface for select GM Vehicles with OnStar, Bose, and GM LAN Data Bus Compatible with or without factory amplified audio system Can be used if the vehicle does not have OnStar Compatible with or without Bose systems Retains the 5.1 Digital audio system in select GM Vehicles Replaces factory radio in 20032006 GM SUVs and trucks while retaining OnStar Plug and play, no cutting or splicing into factory plug PACOS2/PACOS2 Bose communicate directly with the OnStar module to prevent false triggering and eliminating unwanted audio noise On-board amplifier will drive two 4W speakers in stereo Use with the existing factory speakers or external speakers