In that Porsche example, you'd just leave the knob set to AUTO and it will always do the right thing. When the wipers come on (manually or otherwise) so will the low beams, given that this is a legal requirement in many places.

At least they had the sense not to try to invent an icon for 'AUTO', to give credit where it's due. English subtitles or (better) dashboard 'tooltips' would have been a good idea, and tooltips are in fact used in quite a few other contexts.