i have a z1 oct/06. my brother think i get loud hissing noise cuz i keep taking the z1 in and out of the dash he think im burning the unit, but anyway he mite be right, well now i dont have any sound from my front output, therefore my bluetooth and my guidance have no sound, does anyone one know of the parts i need to replace? the wire from the harness looks ok, not loose or anything. please help me out someone thanks in advance.

YEar/make/model of vehicle would be helpful. As well as any other aftermarket equipment installed in the vehicle.