When replacing the Oem radio in select vehicles some features will be lost or not function. This radio data interface will retain those features and provide Nav outputs for multimedia radios. This interface will work in non amplified models. Retains Onstar/ and OE Bluetooth. If the vehicle is amplified, either use the GMOS-04 interface, or bypass the amplifier. If bypassing the amplifier, follow the *Axxess Interface Amp Bypass Schematic* in the documents section.