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Old 08-30-2012, 08:52 PM   #5
nonseqtur
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Join Date: Apr 2011
Location: Kansas City
Posts: 19
My Ride: '04 TiAg 330i
I dealt with this on someone's 99 323i. Some speaker wires in the trunk were crossed, thanks to a sloppy aftermarket subwoofer setup. Anyhow, the head unit behaved as normal, but no sound until the wires were taped off better.

Based on that, I would say it could be something as simple as an exposed wire. But if your setup is stock then you could look for a long time without finding the bad spot. If you have some half-assed aftermarket amp or sub, start there.
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