After a ride with my new elk, I had to manually press the air conditioning or defroster key every time the windows were fogged, maybe you can help me: 1. how does the serial fog sensor work in the summum? Until now, I had to manually press the air conditioning or defroster key when the windows were fogged. In the manual there is also no word about the fog sensor. 2. Sometimes it happens that after the engine start (although not disabled) the control lights in the buttons for the track warning assistant and the distance warning DO NOT glow! – a look at the sensus reveals however that the chip is set. Also the systems work perfectly – only the control lights in the buttons are off. So I now press the button of the “spurwarnassist” – I turn off the system! At the same time, however, the control lights in the button for the distance warning is activated – the navigation lights in the button track warning assistant is only displayed after twice – (turn off, turn on) – then everything is normal again. Do you have to see the radio menu again, but you can not see the radio button again.