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Hello friends, ok so I have a problem with my speakers. First, I connected the battery backwards and I fried my Alternator. Tha's beenn taken care of. The problem now is my radio. I checked all the fuses, and the one in the back of the head unit was out. So i replaces it, but now I get no sound from the 4 main speakers. the small speakers on the door (factory speakers) work.
Do you think I fried my speakers, or something in the head unit. I have the Business CD.

Thanks.
 

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Sounds like the amp has several bad channels. I'd perform the BMW approved hard reset:
- disconnect the ground cable from the battery
- disconnect the "+" cable from the battery
- short the 2 cables together for at least 10 minutes
- reconnect the "+" cable
- reconnect the ground cable.


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Just for information your head unit does not have any power coming from it to power speakers. It just outputs signals to the amp and the amp is what powers the speakers. So the above posting about resetting it is worth a try. You should also check all the fuses in the glovebox to make sure nothing else got interfered with.


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