An interface and corresponding method, where the interface is connected via a first connection to a factory data bus of a vehicle which transports {HEAD ~ signals} according to a first data format, and further connected via {TAIL ~ a second connection} to a data channel of the aftermarket component which transports signals according to a second data format 
An interface and corresponding method , where the interface is connected via a first connection to a factory data bus of a vehicle which transports { HEAD ~ signals } according to a first data format , and further connected via { TAIL ~ a second connection } to a data channel of the aftermarket component which transports signals according to a second data format
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