There are some really useful tips in here. I checked my fuse, it was fine,. Disconnected the battery for half an hour and reconnected it still wouldn't work. In frustration I released the steering wheel tilt and bang the steering wheel up and down 3 or 4 times, hard, right to the top and bang to the bottom. Now my cruise control works! Must be a faulty wire or connector in there. Hope this helps someone.