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Oddly enough something similar recently happened to my 2009 650i recently purchased. The system would intermittently cut out and restart, turning on the radio even with another source selected or radio off. No idea if there is a short or software issue causing it, but it started when I put the navigation DVD in and tried to use it. Took the DVD out and restarted the system, problem hasn’t returned. I’ve read about others having similar issues with the navigation system causing the radio/idrive to cut out as well. It’s a long shot, but worth posting so others don’t spend money chasing a problem solved by using your smartphone instead of the car’s navigation.
Without knowing too much about this particular unit, I'll make one suggestion. When it does work, see if you can find a reset option in your setup options.
If the rest of the radio is working ok it's probably just a software lockup. Disconnect the car battery for several seconds to reset it. Should work after that.
System memory may have been erased/lost due to extended loss of power. System may have to be reprogrammed to effectively work. Do you have the programming CD? If so, check owners manual for programming procedures
Had the same problem with my '03 330xi. Navigation worked fine but radio and CD did not work at all. I opened the fuse box located in the glove compartment to check the three fuses associated with the navigation system and radio. #7, #39, and #41. All three fuses were intact so I put them back in. I then put the key into the ignition, turned it to position 2 and miraculously the radio came to life. I guess it acted as some type of reset?
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