Axxess Technologies GMOS-06 GM Databus Specialty Harness Adapter for Select 2000-2004 Cadillac Vehicles with Bose Factory Audio Systems GM Databus Specialty Harness Adapter for Select Cadillac Vehicle Designed to allow the replacement of the OEM Radio with an aftermarket receiver Retains full functionality of the OnStar system as well as warning chimes Capable of adjusting chime and OnStar volumes Has required outputs for the installation of navigation radio USB updatable with Axxess USB-CAB