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I have a BMW E46 Business Tape/Radio Head Unit, Part No. 65 12 6 935 629. No sound comes out of any of the speakers and yet the display indicates that everything including CD is working OK. My unit works in another car but not in mine. I have, however, tried a BMW Business RDS (which is a cassette/radio only and cannot control a CD changer) in my car and that works fine. All the speakers work OK. A BMW specialist spent all day trying to find the fault without success. I suspect it is a wiring issue but don't know where to start. Can anyone please help? Thanks.
 

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I don't know if this will help but very easy to try. There are 2 fuses in the fuse section associated with radio/CD. Pull them out and put them back in. That's all.
I had a similar problem where I was getting no audio on radio/CD/TV. I searched on this site and someone suggested it and it worked. Hope it helps.
 
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