G-Ghost, If you pull the fuse on your spoiler motor, a red light flashes on the spoiler button as soon as you pass the speed where it normally goes up. That's to let you know the spoiler isn't working.
But when you get to a speed where most people feel that it's really necessary, (about 95 mph on my car) that's when an audible alarm sounds off to make sure that you know you're well on your way to the "Danger Zone".
My spoiler doesn't go up on its own until I reach about 65 mph. But since I usually cruise with the local traffic, and seldom ever drive over 75 mph, I choose to keep it down. Keeping the spoiler down when I'm on dry pavement at these speeds has never been an issue in the past.
But if I get caught in high winds and or rain, I always raise my spoiler at highway speeds.