I'm having problems with the interior light in my 90" TD5 from 2000. When I open the doors the light doesn't turn on, but if the key is in the ignition and turned the lights are on when the doors are open, and then slowly turns off when I start the car.

I have tested all switches at the doors and they work fine as long as the key is turned in the ignition.

Does anyone have an idea of where to look?

Jesper