If it turns stuff off you will see errors in the battery regulator logs.
Quiescent stage 1 - 6 along with date and time.
It is unlikely to do this if the engine is running unless there is another power supply problem.
I haven't read the owner's manual for my mirrors, but they seem to come on with rear heated screen, but sometimes I am disappointed with the performance compared to my previous Passat which had them on all the time unless the mirror control knob was turned from the centre position.
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