Taking a quick look at the pin out for the DME...my quick browse sees at least two signals (Pins #4 & #19) in connector X60004 that send a signal to the E-box fan. So perhaps the fan comes on when some specific condition occurs and is turned on by the DME:

https://www.newtis.info/tisv2/a/en/e...8i-sav/YlRtyII

{see connector X60004}

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)