Ooo! The headlight angle adjustment switch! Thats what it is, its used to adjust the angle that your lowbeams face the road, moving it up and down you will be able to see the lights moving out on the road (that is, if its working properly), its pretty cool. Our diesel wagon we rented when we were in Germany two summers ago also had this feature, it was fun to play with  , and also helpful for finding an optimum lighting angle on the road.
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