Hello, I have reached to this point where I need to change my '99 c5 a6 stereo. It had an afrermarket stereo unit in it but it stopped working so I found a nice Pioneer with USB from my garage. The problem is that the old unit used 3 ISO sockets, two short ones(black and brown) and one longer black one but this new Pioneer has only two short sockets. When I connect them one plug stays useless and this unit wouldn't even start. So the question is how can I make this stereo working, do I just have to change some wires and if so then which ones?
Best wishes
R-A
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