Just wanted to tell everyone that the problem is fixed now.
After investigating all the relays I could find and double-checking all the fuses, nothing was found to be wrong.
I then started to look for loose calbles, but after a while I had to admit defeat. I do not have the knowledge or the place to be to really start pulling everything behind the dash apart.
So I enlisted the help from a proffessional. He could fairly quickly find a loose cable somwhere. I do not know exactly where.
So now everything is good again. Well, except for me feeling stupid. But I can take that.
