This Custom Fit Performance Interface allows you to replace your factory OEM stereo while retaining factory steering wheel controls, if the vehicle is equipped. This interface will maintain the data-controlled +12V accessory output as well as provide navigation outputs for reverse, vehicle speed pulse and parking brake. An interface is a small computer system that allows your new head unit to properly communicate with your vehicle's computer system. If you install a new aftermarket radio without using an interface, you will lose many of the standard security features of the vehicle. This is due to vehicle manufactures running part of the vehicle's computer system through the OEM radio. Functions lost include, but not limited to, are warning chimes (keys left in ignition, lights left on, low fuel etc.), security and alarm systems, +12V accessory and more. If the +12V accessory is lost, your radio will not turn on/off automatically and will be a manual process.Specifications: WARNING CA Proposition 65 Yes WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Description_DES Custom Fit Performance Interface Description_EXT Custom Fit Performance Interface; w/Quadlock Style Connector; Data Driven +12V Accessory Output w/R.A.P.; VSS; Parking Brake; Reverse; Retains Steering Wheel Control Functions; Description_FAB Data Driven 12V Accessory Output with R.A.P. Description_FAB VSS Speed Pulse Description_FAB Parking Break Description_FAB Reverse Description_FAB Illumination Description_FAB Retains All Safety And Warning Chimes For GM Platforms Description_FAB Retains Steering Wheel Control Functions Description_MKT This Custom Fit Performance Interface allows you to replace your factory OEM stereo while retaining factory steering wheel controls, if the vehicle is equipped. This interface will maintain the data-controlled +12V accessory output as well as provide navigation outputs for reverse, vehicle speed pulse and parking brake. An interface is a small computer system that allows your new head unit to properly communicate with your vehicle's computer system. If you install a new aftermarket radio without using an interface, you will lose many of the standard security features of the vehicle. This is due to vehicle manufactures running part of the vehicle's computer system through the OEM radio. Functions lost include, but not limited to, are warning chimes (keys left in ignition, lights left on, low fuel etc.), security and alarm systems, +12V accessory and more. If the +12V accessory is lost, your radio will not turn on/off automatically and will be a manual process. Description_SHO RadioModInt This Part Fits: Year Make Model Submodel Notes 2007 Mercedes-Benz E280 4Matic 2008 Mercedes-Benz E300 4Matic 2002 Mercedes-Benz E320 4Matic 2003 Mercedes-Benz E320 4Matic 2004 Mercedes-Benz E320 4Matic 2005 Mercedes-Benz E320 4Matic 2002 Mercedes-Benz E320 Base 2003 Mercedes-Benz E320 Base 2004 Mercedes-Benz E320 Base 2005 Mercedes-Benz E320 Base 2007 Mercedes-Benz E320 Bluetec 2008 Mercedes-Benz E320 Bluetec 2005 Mercedes-Benz E320 CDI 2006 Mercedes-Benz E320 CDI 2006 Mercedes-Benz E350 4Matic 2007 Mercedes-Benz E350 4Matic 2008 Mercedes-Benz E350 4Matic 2006 Mercedes-Benz E350 Base 2007 Mercedes-Benz E350 Base 2008 Mercedes-Benz E350 Base 2002 Mercedes-Benz E430 4Matic 2002 Mercedes-Benz E430 Base 2004 Mercedes-Benz E500 4Matic 2005 Mercedes-Benz E500 4Matic 2006 Mercedes-Benz E500 4Matic 2003 Mercedes-Benz E500 Base 2004 Mercedes-Benz E500 Base 2005 Mercedes-Benz E500 Base 2006 Mercedes-Benz E500 Base 2002 Mercedes-Benz E55 AMG Base 2003 Mercedes-Benz E55 AMG Base 2004 Mercedes-Benz E55 AMG Base 2005 Mercedes-Benz E55 AMG Base 2006 Mercedes-Benz E55 AMG Base 2007 Mercedes-Benz E550 4Matic 2008 Mercedes-Benz E550 4Matic 2007 Mercedes-Benz E550 Base 2008 Mercedes-Benz E550 Base 2007 Mercedes-Benz E63 AMG Base 2008 Mercedes-Benz E63 AMG Base