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it is very hard to fix a nav. first check the CD/DVD in the navi unit. is it correct one and in good condition. note. no burned ones, and make sure region and area is all good. if that is good it is most likely a bad navi unit. make sure no one disconnected the power to the navi unit either uplugging the navi until it goes asleep can damage it, best have BMW dealer fully inspect navi system.

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Q: How do you fix the navigation system for BMW 745?
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