An update on this one;
The plastic thing around the wheel, mudflap I suppose it's called in english, was catapulted in the bumper a while ago, and today I noticed alot of snow/ice in there, so I removed all the ice, and repaired the mud flap.
Next what I did was opened up the D4 connector, on the outside it looked TERRIBLE:
But the inside looked rather clean, I only noticed something, that might be a problem.
You have 3 rows of pins in the D4 connector, and I noticed only the inner pins were gold-colored, and the outer pins were all grey (but not the white/green corroded look...), is this normal?
Next, I noticed the back of my headlight was not closed, the garage probably did this because there was some moisture in the headlight. I closed it, we'll see...
To continue with the symptoms,
First, dash does not work
Second, only once in a long timespan, the headlights dear to 'flicker' for a sec. After that, nothing seemed to happen.
Third, I tried to put on parking lights, they work, but they don't show up on the dash, and don't make that beep they usually do?
Fourth and last, I was driving, and suddenly my back wiper went on, and my front wiper didn't want to do anything.
This is getting really funny...