Main switch for ACC

[acer]

My ACC doesn’t seem to be working all of a sudden. It just says “ACC Deactivated”. When I try to activate it using the controls on the steering wheel it asks me to use the “main switch”. I can’t find this anywhere and my wife spent half an hour with the manual. Where is the main switch? How do I fix this? I feel almost certain that I’m missing something really obvious.
By the way, there was a thread similar to this a few years ago and the OP was advised to drive faster than 30 mph to make it work. This doesn’t work for me.
One thing I will check in the morning is that the sensor isn’t dirty. I’ve done a lot of miles in France over the last couple of days and the windscreen is covered in insect sludge. I know the sensor is somewhere around the VW badge at the front, but I’m not exactly sure where? Or, how to access it to clean it.
Grateful for your thoughts.

 

[WelshGas]

My ACC doesn’t seem to be working all of a sudden. It just says “ACC Deactivated”. When I try to activate it using the controls on the steering wheel it asks me to use the “main switch”. I can’t find this anywhere and my wife spent half an hour with the manual. Where is the main switch? How do I fix this? I feel almost certain that I’m missing something really obvious.
By the way, there was a thread similar to this a few years ago and the OP was advised to drive faster than 30 mph to make it work. This doesn’t work for me.
One thing I will check in the morning is that the sensor isn’t dirty. I’ve done a lot of miles in France over the last couple of days and the windscreen is covered in insect sludge. I know the sensor is somewhere around the VW badge at the front, but I’m not exactly sure where? Or, how to access it to clean it.
Grateful for your thoughts.

The sensor is a black square below the VW badge.
On my Multivan there is a Resume and Set button but beside the Resume button there is another button that allows you to switch On the ACC function.
Do you have something similar?