As a powerful diagnostic tool, MB Star C3 is mainly designed for new type of Mercedes cars and trucks from 1999 up to now. In the aspect of function, it not only support basic diagnostic function (reading and erasing DTCs), but also can perform many other functions, such as component testing, live-data, writing diagram etc.
And here, I would like to list the error which may occur via connection. At the same time, it is also the problem I found on some forums. Previously I do not how to settle it, and then I consult the Eobd2 engineer for help. A good result is it.
Problem (MB Star C3 multiplexer connection error):
2. Mercedes-Benz C3 multiplexer HDD has some problem, maybe you use old HDD (fit usual c3) but use SD connect star C4 main unit
3. Star c3 diagnosis main unit has problem, and then you have to connect with a car, and to check if main unit is turn green.