CRUISE CONTROL SYSTEM

FUNCTION OF MAIN COMPONENTS

Component		Function
Cruise Control Main Switch	ON/OFF Button	Turns on/off the power to the cruise control system.
	CANCEL Switch	A cancel signal can be output to the ECM through the operation of this switch.
	+RES Switch	The acceleration function and resume control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
	-SET Switch	The deceleration function and set control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
Speed Sensors		Detects the vehicle speed and transmits a signal via the skid control ECU to the hybrid vehicle control ECU.
Throttle Body with Motor Assembly	Throttle Control Motor	Adjusts the throttle valve to the limiter position in accordance with signals from the ECM.
Throttle Body with Motor Assembly	Throttle Position Sensor	Transmits the throttle valve position information to the ECM.
Stop Light Switch Assembly		Detects the depressing of the brake pedal and transmits a signal to the hybrid vehicle control ECU.
Shift Lever Position Sensor		Detects the shift lever position and transmits a signal to the hybrid vehicle control ECU.
Combination Meter Assembly	Multi-information Display Cruise Control Indicator Light Cruise Control SET Indicator Light	Cruise control indicator light illuminates when the ON/OFF button has been pressed to turn the cruise control system on. If the hybrid vehicle control ECU detects a malfunction, cruise control indicator light turns off to warn the driver. Cruise control SET indicator light illuminates when the -SET switch on the cruise control main switch has been pressed to set the cruise control system. Displays a warning message to alert the driver in accordance with a signal sent by the hybrid vehicle control ECU. Displays a set speed when the vehicle speed is set.
Combination Meter Assembly	Master Warning Light	Displays a warning message to alert the driver in accordance with a signal provided by the hybrid vehicle control ECU.
Hybrid Vehicle Control ECU		Controls the cruise control system in accordance with signals from the switches and sensors. If the hybrid vehicle control ECU detects a malfunction in the cruise control system, it will store a Diagnostic Trouble Code (DTC).
Transmission Floor Shift Assembly	Transmission Control Switch	Detects the shift lever upward or downward position switch operation and transmits a signal to the hybrid vehicle control ECU.
Accelerator Pedal Sensor Assembly		Detects the accelerator pedal depression degree and outputs it to the hybrid vehicle control ECU.
Telltale Light Assembly	VSC OFF Switch	Enables the driver to select normal mode, TRC OFF mode or VSC OFF mode.
ECM		Actuates the throttle control motor in accordance with the signals from the hybrid vehicle control ECU.
Inverter with Converter Assembly	MG ECU	Built into the inverter with converter assembly. Controls the motive force of motor generators in accordance with signals from the hybrid vehicle control ECU.

FUNCTION

The cruise control system has the following functions:

Function	Outline
Set Control	When the ON/OFF button is turned on and the cruise control main switch is pressed to the -SET direction and released, the hybrid vehicle control ECU stores the vehicle speed in the memory and continues to control the vehicle at that speed. The set speed can be between 40 km/h (25 mph) and 200 km/h (125 mph). Furthermore, when the cruise control system is running, the cruise control SET indicator light on the combination meter assembly illuminates.
Coast Control	When the cruise control main switch is kept pushed to the -SET direction while the cruise control system is running, the throttle control motor is energized in the throttle closing direction or the MG ECU decreases the motive force of MG2, and the vehicle keeps decelerating. The hybrid vehicle control ECU stores the vehicle speed when the cruise control main switch is released. From then on, the hybrid vehicle control ECU controls the vehicle speed at that speed constantly.
Tap-down Control	When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be lowered approx. 1 km/h (1 mph) each time by operating the cruise control main switch in the -SET direction quickly within approx. 0.6 seconds.
Accelerator Control	When the cruise control main switch is kept pushed to the +RES direction while the cruise control system is running, the throttle control motor is energized in the throttle opening direction or the MG ECU increases the motive force of MG2. The vehicle keeps accelerating and the hybrid vehicle control ECU stores the vehicle speed when the cruise control main switch is released. From then on, the hybrid vehicle control ECU controls the vehicle speed at that speed constantly.
Tap-up Control	When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be increased approx. 1 km/h (1 mph) each time by operating the cruise control main switch in the +RES direction quickly within approx. 0.6 seconds.
Low Speed Limit Control	The low speed limit is the lowest speed that the cruise control system can be set to and is set at approx. 40 km/h (25 mph). The cruise control system cannot be set below that speed. If the vehicle speed drops below that speed while the cruise control system is running, the cruise control system is canceled automatically.
Resume Control	After the cruise control system is canceled for any reason other than a malfunction or operating the ON/OFF button, the mode can be resumed and controlled at the set speed by operating the cruise control main switch in the +RES direction when the vehicle speed returns above the low speed limit (approx. 40 km/h [25 mph]).
Manual Cancel Control	If any of the following conditions is met, the cruise control is canceled accordingly. However, the set speed remains in the memory: On signal is sent from the stop light switch assembly (the brake pedal is depressed). Shift lever is moved from D or S to another position. 1st, 2nd or 3rd range is selected in the S mode position. On signal is sent from the CANCEL switch. ON-OFF button is turned off (the set speed is not stored).
Automatic Cancel Control	When any of the following conditions occurs while the cruise control system is running, the set speed in the memory is cleared to cancel the cruise control system. Furthermore, the cruise control indicator light turns off and a message indicating a malfunction will be displayed on the multi-information display until the ON/OFF button is turned off, and the operation of the cruise control system is disabled until the ON/OFF button is turned on again. The stop light switch assembly has an open or short circuit.
	When any of the following conditions occurs while the cruise control system is running, the set speed in the memory is cleared to cancel the cruise control system. Furthermore, the operation of the cruise control system is disabled until the ON/OFF button is turned on again. Malfunction in the hybrid system.
	When any of the following conditions occurs while the cruise control system is running, the set speed in the memory is cleared to cancel the cruise control system. Furthermore, the cruise control indicator light turns off and a message indicating a malfunction will be displayed on the multi-information display until the ON/OFF button is turned off, and the operation of the cruise control system is disabled until the power switch is turned off. The stop light switch input signal is abnormal. The cancel circuit has a malfunction. Communication malfunction between the skid control ECU and hybrid vehicle control ECU. Malfunction in the brake system.
	When the following condition occurs while the cruise control system is running, the cruise control system is canceled. The cruise control system can be resumed at the set speed by operating the cruise control main switch in the -SET or +RES direction providing that the vehicle speed is above the low speed limit (approx. 40 km/h [25 mph]). The vehicle speed falls below the low speed limit (approx. 40 km/h [25 mph]). The set speed in the memory is maintained.
	When the following condition occurs while the cruise control system is running, the cruise control system is canceled. The cruise control system can be resumed at the set speed by operating the cruise control main switch in the -SET direction providing that the vehicle speed is above the low speed limit (approx. 40 km/h [25 mph]). The vehicle speed drops more than 16 km/h (10 mph) below the set speed. The set speed in the memory is cleared.
Other Cancel Control	If any of the following conditions occur during cruise control driving, the cruise control is canceled. However, the set speed remains in the memory. The VSC system is activated. The TRC system is activated for a period of time. The VSC or TRC system is turned off by pressing the VSC OFF switch. When the power switch is turned off, the set speed is not stored in the memory.

DIAGNOSIS
1. If a malfunction occurs in the cruise control system, the hybrid vehicle control ECU cancels the cruise control system. The hybrid vehicle control ECU turns the cruise control indicator light off and a message indicating a malfunction will be displayed on the multi-information display to inform the driver of a malfunction. At this time, the hybrid vehicle control ECU memorizes the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC). For details on the DTC, refer to the Repair Manual.