My fan failed three months ago. Looking for a replacement, my one requirement was a brushless unit if available. A TOPAZ 64546921381 fit the bill. One year unlimited mileage use. Through Amazon, you can add a four year replacement plan. It's a good deal.
After turning off the X5, the fan spins down for 10-12 seconds. Turns on with A/C control. I'm not sure sure about DME control. I have yet to test it. When I have time, I'll try to use my Foxwell 520 Pro.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)