Do you mean the cruise control, or speed control, that lets you drive with your foot off the gas pedal? That usually requires a scanner to access the Engine Computer to see what's working and what isn't. If you have any type of light that turns on when the cruise control is turned on, and that's not working, you might suspect the "clock spring". That is a wound-up ribbon cable in a plastic housing under the steering wheel. Two of the circuits in that cable are for the cruise control switches. It's common for those cables to break. Very often the horn doesn't work either.
The scanner will display the switches and whether they're on of off, and it will show if the computer is trying to activate the servo under the hood. If it is not, it will show why. If it is, but it's still not working, either the servo is bad or its throttle cable is broken.
Sunday, April 8th, 2012 AT 9:07 PM