I have had the same experience as denrusso - the unit remains active for a short time after turning off the engine. Haven't timed it, but I think it could be for less than 15 seconds.
My 2010 S4 had the same behavior as the X3. In Toyotas that I have come across, the units were always operational - basically as dangerous as leaving the remote in the car.
As pokerface said, it would be good if the unit could have power retention for a limited time (like with the windows), or perhaps retain the power until the driver's door is opened.
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'19 G01 X3 M40i Phytonic/Oyster
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