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I've got a MK4 GTI VR6 and I've recently changed out the head unit for an older model Pioneer. When I was unhooking the wiring harness from the previous head unit I noticed a black box with wires connecting to it. The black box was not connected to the unit nor does it look like it connects to it. Could anyone shed some light on this mysterious box? 20150420_072043.jpg 20150420_072031.jpg

Much appreciated, AP
 

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