when moving the electronic seat the left hand passenger light illuminates very dimly, if you switch light off or remove the bulb the seat won’t power !
Same as when you lift the sun visor mirror, the seat won’t move unless the flap is down.
I suggest a bad earth connection. Several wires go to the same earthing bolt, and are in contact with each other but bad contact to the car. The current is supposed to flow through the bodywork, but instead it flows ‘backwards’ through the other components on the same earth.