Radio replacement interface; Retains chime function; Outputs for navigation radio functions; Interface can be quickly updated if needed from PAC(R) website using PAC-UP USB adapter; RadioPro5 interface for 2014 Chevrolet Silverado 1500 & 2014 GMC Sierra 1500 with 29-bit GM LAN V2 databus with 20-pin & 16-pin harnesses; Retains OnStar(R) functions;