Anyone had any updates on this? I am having the same issue, sounds like the aux fan to me.. noticed it at 3am this morning, on again.. unlocked and locked car shut it up.
I trickle charged my battery early this week (it was almost flat), next day, battery warning again. Had the battery and alternator tested - all fine.
I am awaiting on a call back from a BMW technician to see if it's something they have seen. I did just launch the BMW connected app, went into "Start Climate Timer" and clicked "Deactivate Start Time" - see if that has any effect (as I have never set it, but thought worth a try!)
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