Dear Bart
Look at the diagrams shown below.
As Paul told you there is a bridge between fuse ports 9&10 and then between 11&12. That bridge is internal to the fuse box. It exist on the feed side of the fuses, you can check it’s existence with a multimeter doing a continuity check.
Then….. let’s look at the diagrams. First the diagram for the multi function switch at the steering column, which is responsible of the high bean horn on cars.
Before that one remark. If your car was sold on the American market the high beam horn is nullified, so that option will not work unless you modify the harness.
It’s no so hard……
Remove harness, internal side, leave all in the drivers floor. Remove all the insulation on the main harness branch that goes to the main fuse box.
There….. you will find a hidden cable white/violet stripe. That cable should be connected on fuse no.10 output.
And BINGO you will have now your high beam horn working….
That is most probably what is wrong in your car….
Write back and report results.
Best regards
Leo