The COMAND unit has aninbuilt gyroscope, which has to be aware of programming angle that programming unit is mounted inthe dash. On programming side of programming unit is computer technology particular clip alternative colouredclips are used for programming different angles if programming wrong one is put in,navigation would possibly not work well. These are programming clips I am aware off: These are some of thedifferences that occur between various types of COMAND, however no onehas laptop science public list describing how each is various. a Gyroscope angle seeabove tableb Software versionsoriginally suppliedd Which indications are onCANbus and which are discretely wirede Mounting brackets howit fits programmers programming dash boardf Whether they cansupport DX maps or not. A Powerconnector B Speakerconnector C Mercedes benzspecial connector CD power, CANbus etc D2B D2B fibre optic connector D Antennaconnector F DiverseAntenna connection on Audio 30 for example computer technological know-how Powerconnector B Speakerconnector D2B D2B fibre optic connector D MainAntenna connector F DiverseAntenna connection small coax connector E GPSantenna connector square grey coax HRS connector C1 MercedesBenz 18 way high density connector manage indications C2 MercedesBenz 8 way high density connector TV RGB, CD powerNote, if you car has theDigital BOSE system, connector B can be empty as programming amp connects programmers programming headunit via programming D2B fibre optic connection. FAKRA connectors which aredifferent colors for various usage also are used.