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I have experienced many electical demons with all my British cars. The nav units can and do fail. I had a goofy one this summer and the only way it got fixed was to replace it. The module not the head unit
I know this is an old thread, but my 2006 325i Nav screen went bank also, but the radio still played. I noticed the glove box light and trunk light did not turn on also. I was told from mechanics is was probably a CID module for $2200, even though I mentioned the glove box and trunk light light were out and specifically inquired about a fuse. The mechanics never checked the fuses, because I checked my fuses in the glove box and found the fuse 61 marked with a BMW symbol that looks like light bulb was blown. The Nav screen started back up once the fuse was changed.
sounds like your car has the multi function steering wheel, i know on the 7 and 5 series they come out of sync, im not sure why.
its about £75 to get plugged in at the dealers and they reprogram it, sometimes i have had the odd car with a damaged slip ring, it does all sorts of things, 1 in particular kept on beeping the horn,
i would say if u got 1 urs got upset when battery flat.
Do you still have warranty left? If so bring it into the dealer for service. Otherwise if you don't have any warranty left there is a software update the dealer can do that may fix it, if that doesn't fix it, a new radio is around 1900 dollars.