Hello Together, in a post on the topic — error message Bi-Xenon — we will also discuss the topic — day running light –. I think that would be interesting for forum members from Austria, for example. Here’s an excerpt from me: My friendly Cit technician didn’t know the setting day driving light at all with the function described by you. He always told me about light setting Scandinavia and the cornering light would still help. I just told him that a friend From Austria the function has been unlocked. And see there goes nevertheless and a technician again smarter than before. So as I said: when ignition a luminaire the main lights + standlight as well as tail lights and license plate lighting. The amature lighting is off and only the display for the main light lights. Curve light is off and when the light sensor turns on everything goes on again completely. It can be deactivated via the on-board computer. I find the function ok in winter, since d in the summer you can deactivate and activate again e.g. in Austria. Fine thing and determines with us soon duty. Greeting c4-limo