Check Cruise System message

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From one day to the next my cruise control system does not work. When I engage it by pressing the button following message is displayed "Check Cruise System"

It does not respond to pressing forward (to disengage the radar control and just go to regular - which I mostly use) or any variant thereof. so I am thinking that it could be a fuse. But my owners manual does not show what fuse it involved and where it is located, so maybe someone here know which would save me from checking every single fuse in the car.

If you have any other solution....................please do say so. Lexus dealer is good, but they are waaaaaay overpriced (I was quoted 1050+ tax for a replacement of auto levelling sensor - did it myself for 305 in 15 minutes)

Thank you very much

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