Cruise Control Systems: Description

WARNING: Deactivate air bag system before performing any service operation. See appropriate AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

Cruise control unit receives command signals from cruise control main switch and SET/RESUME/CANCEL switch. Vehicle operating signals are also received from brakelight switch, Vehicle Speed Sensor (VSS), and gearshift position switch (A/T). Cruise control unit sends control signals to cruise control actuator, which regulates throttle position to maintain selected vehicle speed.

Cruise control unit compares actual vehicle speed to selected speed. Cruise control unit will open or close throttle to change and maintain vehicle speed. When cruise control unit receives a disengage signal, cruise control actuator will allow throttle to close. A signal from brakelight switch disengages system when brakes are applied. Gearshift position switch or cancel switch can also send disengage signals to cruise control unit. See Figure and Figure .

Cruise control actuator on 3.2TL is electrically operated with a magnetic safety clutch. Cruise control actuator on 3.5RL is vacuum operated and electrically operated vacuum control valves.