Description of Cruise Control System Components and Functions

CRUISE CONTROL SYSTEM COMPONENTS AND FUNCTIONS

Component	Function
ECM and electric throttle body	ECM executes centralized control over all functions including setting a constant speed, resuming it, setting coast, cancelling cruise control limiting minimum speed. ECM controls electric throttle valve opening to keep actual vehicle speed at set (target) speed.
MAIN (ON/OFF) switch	This switch has a momentary contact type button to press cruise control system ON and OFF.
SET/COAST switch	When this switch is pressed (ON) and then released (OFF) while vehicle is running at a speed 40 km/h (25 mile/h) or higher, vehicle speed at that OFF moment is stored in memory and it is maintained (constant cruising). Pressing this switch (ON) continuously during constant cruising keeps slowing down vehicle speed as long as it is ON. When it is released (OFF), vehicle speed at that moment is stored in memory and vehicle starts constant cruising. Pushing this switch during constant cruising decreases vehicle speed according to number of times the switch is pushed.
RES/ACC switch	When this switch is pressed (ON) during constant cruising, vehicle speed keeps increasing as long as it is ON. When it is released (OFF), vehicle speed at that moment is stored in memory and vehicle starts constant cruising. If vehicle speed is higher than 40 km/h (25 mile/h) after cruise control is cancelled, pressing this switch ON momentarily will resume the speed at which vehicle was running before cancellation. Pushing this switch during constant cruising increases vehicle speed according to number of times the switch is pushed.
CANCEL switch	When this switch is pressed (ON), cruise control (throttle valve control) is cancelled.
Wheel speed sensor (vehicle speed signal)	ECM receives speed sensor signal from ABS or ESP® control module through CAN communication and calculates vehicle speed using that signal.
Brake light switch	Brake light switch has 2 contact points. One contact point closes when brake pedal is depressed to light brake light and provides a voltage signal to the ECM. The other contact point (brake pedal position switch) opens when brake pedal is depressed, to shut off power to cruise control of ECM, thereby cancelling cruise control (throttle valve control). This switch is installed to cancel cruise control (constant cruising).
Clutch pedal position (CPP) switch (M/T model)	When clutch pedal is depressed, clutch pedal position switch closes and provides a ground signal to ECM. ECM cancels cruise control (throttle valve control) when this signal is inputted.
TCM (CVT model)	TCM sends shift position signal and manual mode gear position signal through CAN communication to ECM.
"CRUISE" indicator light	In the state with ignition switch ON and cruise control system OFF, pressing MAIN (ON/OFF) switch once and releasing it will activate the cruise control system and ECM will cause indicator light to light up.
"SET" indicator light	It lights up when cruise control (throttle valve control) is functioning.