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All your interior functions run off the body control module, first thing to check is all fuses. If you have power to the inside, then check fuses. The other possibility is, how was the car stored? There can be corrosion behind the fuses panels, in modules, and at grounds. I’m more familiar with e60, but, these are all possibilities and just a guesstimate, and the obvious. You need ignition power first, to proceed further.
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