Repairing the cruise control system on any car is not something that that can be easily done at home, unless you are very well versed in vehicle repairs. The problem is that to make your cruise control system functional again, you must first diagnose the problem, which is itself often fairly complicated. For example, there may be a problem with your speedometer, or a fuse may have to replaced in order for the cruise control to work. In any case, you will have to consult your car's manual. You may wish to read this article on the challenges of repairing a cruise control system on your own.