That's right - I drove off the other day with ice still at the top of the screen, and I got a couple of messages 'Forward Collision avoidance disabled - Clean the screen' and the same for the lane departure.Somebody said if you put a piece of tape over the camera, you would get more FCW warnings. I haven't done that either. Is your adaptive cruise control working? Mine works great, so I know the radar part is functioning. I believe FCW uses both the radar and the camera.