When replacing the OEM radio with an aftermarket radio some feature can be lost. Using our interface you can retain those features. This interface will also provide you navigation signal outputs ( parking brake, Reverse, and Speed sense), retain chimes through a onboard speaker and work in non amplified models.Specifications: WARNING CA Proposition 65 Yes WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Description_DES Data Interface Description_EXT Data Interface; Description_FAB Provides Accessory Power 12-Volt 10-Amp Description_FAB Retains R.A.P. Retained Accessory Power Description_FAB Provides Navigation Outputs Parking Brake/Reverse/Speed Sense Description_FAB Retains Balance And Fade Excluding Digital Amplified Models Description_FAB Retains Chimes Description_FAB Retains OnStar / OE Bluetooth Description_FAB Retains Rear Seat Entertainment Description_FAB Retains SAT Satellite Radio Description_MKT When replacing the OEM radio with an aftermarket radio some feature can be lost. Using our interface you can retain those features. This interface will also provide you navigation signal outputs ( parking brake, Reverse, and Speed sense), retain chimes through a onboard speaker and work in non amplified models. Description_SHO RadioModInt