As the days get shorter I'm finding myself driving more frequently after dark and being annoyed by the very, very bright head unit. I know I can (and do) turn the screen off, but I could have sworn that the maps screen used to to turn dark (like "dark mode") before, yet it no longer does that. I've got a sensor in the centre speaker (on top of the dash) which I thought was the sensor responsible for this, and it's unobstructed. Is there a setting somewhere that I might have messed up? Any way to diagnose the sensor?