The manual is in Italian, which I don't know. Sounds like I'm screwed unless I can get the Nav screen back up.

Nav used to work before the battery change. At least the screen was faintly there. Is there a fuse I should check?

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Reno, France near Deutschland
E70 40d LCI nicely kitted out but no bling stuff
E53 3.0d facelift with manual gearbox
E39 530i facelift with manual gearbox
And a couple lesser vehicles of necessity