The typical modern cruise control system includes an electronic control module, a wiring harness, various switches, an actuating servo, input from the vehicle speed sensor, and vacuum controls.
Cruise control automatically maintains consistent vehicle speeds, reducing driver fatigue during extended driving periods.
As a system, cruise control doesn't require regular maintenance. Generally, the system is taken for granted until it no longer works or works improperly. Most cruise ailments stem from simple things like a blown fuse, disconnected or damaged wiring, bad connections or grounds; cut, split, or broken vacuum hoses and fittings; and misadjusted, damaged or missing servo linkage. Some common cruise control problems include non-engagement, inability to hold a set speed, no response to switch inputs, and surging with the cruise set.
If your car's cruise control system acts up, first check the owner's manual to find the fuse location and make sure the fuse is OK. Replace the fuse if bad. Outside of a simple fuse, it's wise to have your car's cruise control system diagnosed by a professional service technician. Many of today's systems are rather sophisticated and require special skills and training to get to the heart of the problem.