Can-Bus Adapter UniversIf the OEM radio installed ex-factory is to be replaced by a retrofit radio in a vehicle controlled by CAN Bus, a specific CAN Bus Adapter is required.Specific and universal CAN Bus Adapters convert relevant digital data of the respective vehicle-specific data bus into analogue signals. Depending on the color equipment, different signals, such as ignition plus, lighting, reverse gear signal or also a speed signal are read out and provided in the same way for different retrofit solutions.Note:CAN Bus connection: Article 42cx10 Specifications can be found under the vehicle-specific cable tree numbers for the following vehicles: Alfa Romeo Alfa Romeo Romeo 147 (973) 09/2006 - 04/2010Alfa Romeo 159 (939) 09/2005 - 03/2008Alfa Romeo 159 (939) 03/2008 - 11/2011Alfa Romeo Brera (939) 01/2006 - 10/2010Alfa 2010Alfa Romeo Giulietta (940) 05/2010 - 10/2013Alfa Romeo Romeo GT 2004 (937GT) 02/2006 (955) 09/2008 - 10/2013 Alfa Romeo Spider (939) 01/2007 - 10/2010 AudiAudi A1