Cruise control (sometimes known as speed control or autocruise) is a system that automatically controls the speed of a motor vehicle. The purpose is to accurately maintain the driver’s desired set speed, without intervention from the driver, by actuating the throttle-accelerator pedal linkage.
The following diagram showing the detail circuit of 1997 Toyota Corolla Cruise Control System. The cruise control ECU (located in the center of the dashboard) is connected to instrument cluster system, data link connector (in the left side of the engine compartment), cruise control clutch switch, cruise control diode, starting and charging system, cruise control actuator, engine control system (throttle position sensor), stop light switch, engine control module (ECM) and transmission system (electronically controlled by the transmission solenoid).
Find the detail circuit diagram of 1997 Toyota Corolla Cruise Control System here. (source: autolib.diakom.ru).