Had an interesting experience today on a long trip - ACC had been working fine earlier in the day but when I pressed set in the afternoon all I got was a beep and the ACC off message, even though it was on.
At first I thought it might be low sun, but it was still doing it when in shade.
I think what might have happened was that the camera sensor may have been dirty even though I’d been using the screen wash to clear the screen and it was quite clear.
A very long blast of screen-wash and it was working again.
There was no message to say camera dirty though, which you usually get when it’s fogged up first thing in the morning.
The jazz washer jets are very efficient- despite many sprays I didn’t have to top up the washer bottle by that much.
