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I just had the same problem - it was a loose connection
I just had the exact same problem on my F12 640i. Passenger seat works - drivers side illuminates the 3 LEDs and then they go out.
It was a simple issue like another member here. I reached under the seat, and pressed on every single connector on the control module (light Grey/White in color).
The heated seat started working again - all 3 LEDs light up and go off as you press the button! Hopefully it's just this loose connection - it seems to have fixed it. I would give this method a try before buying new seats/modules etc.
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