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680 Hi-fi Question...


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Hi guys;

Well i've been driving my car without an opperational stereo for about 2yrs. I have a 1999,2.5L Boxster with the 6disk player, amp, and 680 Nav. HIFi system. One day i was out driving and just heard a little buzz. No more than .2 mili-secs in time (less than 1 second). After this i couldn't hear any noise from my speakers but could still see that my radio was picking up digital signals. So i know my antenna works or else i wouldn't be able to see which songs are playing from varying radio stations. I thought it was my amp that went ; so i bought a new amp. NOpe not the problem either. I thought maybe my nav went, but i can still put in directions and get to places with its help. I have posted this problem before with little to no luck. Then recently i came across something called a "Control Unit" part number 27 on the diagram (OEM-99664712400). I noticed that it has a connection to two big wires. I'm guessing this is the output to the speakers for the left and right side. Can anyone shed some light on numbers 31, and 27 from the digram? I've already checked my fuses and none of them are blown. So i either have a blown radio (>$3k for a new one) or this Control unit might be cooked.

diagram of radio http://www.pelicanparts.com/PartsLookup/HT...1-01-Frame3.htm

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