Hi all, I bought a second hand rear dome for my B7 Avant and it works completely back to front. When it is set to the middle and I unlock the car it lights up with the rest of the car. When I open the boot it goes off whilst the other dome lights stay on. However when I close the car and put the key in and drive, the luggage light stays on???

So when open does not work, when closed works like a charm? How have I got reverse polarity?