I'm having the same problem in my 2006 Z4M. Battery keeps dying and was just told today that my NAVI unit is fried. Apparently it stays on at times even when the car is off. However, the screen still pops up and down, and sometimes still displays everything on screen. I was told I have to replace the entire NAVI unit (is the module built in the unit?) but that's $2,500! What if i replace it and I still have the same issue? Any help is appreciated!
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