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I can tell you from experience that there is some sort of charge (or maybe its just a requirement to pair to the car) that's required by the comfort access key fob (at least in the LCI E90s) which requires you to put it in the key slot to get "charged." I had his EXACT experience and that was the solution.
I thought the dealer was nuts until I did it and it resolved everything. That is also how the service advisor pulls your data initially as your car information (to a degree) is synched to the key when it is inserted.
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