Hello, when it comes to thickening, the light is always on when I shift the controller to AUTO. However, according to my knowledge and older cars, the switch is there to turn on light when it is needed. VW meant it’s normal – heh? Is this what my light sensor is wanted or is defective? This is integrated in the interior mirror, right? Could you change it yourself? What does the said sensor cost – does jmd perhaps have a page with the parts a la BMWfans?