Toyota 2007 YARIS Wiring Diagrams page 108

System Outline
The cruise control system is a constant vehicle speed controller in which control of the switch on the instrument panel makes
it possible to automatically adjust the opening of the engine throttle valve without depressing of the accel pedal.
1. Set Operation
When the CRUISE SW is turned on and the SET SW is pushed with the vehicle speed within the set limit (Approx. 40 km/h,
25 mph to 200 km/h, 124 mph), a signal is input to TERMINAL CCS of the engine control module, and the vehicle speed at
the time the SET SW is released is memorized in the ECU as the set speed.
2. Set Speed Control
During cruise control driving, the ECU compares the set speed memorized in the ECU with the actual vehicle speed input
into TERMINAL SPD of the engine control module from the combination meter, and controls the throttle body assembly to
maintain the set speed.
When the actual speed is lower than the set speed, the ECU causes the current to the throttle control motor to flow from
TERMINAL M+ of the engine control module to TERMINAL 2 of the throttle body assembly to TERMINAL 1 to TERMINAL
M– of the engine control module. As a result, the motor in the throttle control motor is rotated to open the throttle valve to
increase the vehicle speed. When the actual driving speed is higher than the set speed, the current to the throttle body
assembly flows from TERMINAL M– of the ECU to TERMINAL 1 of the throttle control motor to TERMINAL 2 to TERMINAL
M+ of the engine control module.
This causes the motor in the throttle body assembly to rotate to close the throttle valve to decrease the vehicle speed.
3. Coast Control
During cruise control driving, while the –SET SW is on, the throttle control motor is rotated to close the throttle valve and
decrease the driving speed. The vehicle speed when the –SET SW is turned off is memorized, and the vehicle continues at
the new set speed.
4. Accel Control
During cruise control driving, while the +RES SW is turned on, the throttle control motor is rotated to open the throttle valve
and increase the driving speed.
The vehicle speed when the +RES SW is turned off is memorized and the vehicle continues at the new set speed.
5. Resume Control
If the vehicle speed is approximately 40 km/h (25 mph) or above after canceling the set speed with the CANCEL SW,
pushing the +RES SW will cause the vehicle to resume the speed set before the cancellation.
6. Manual Cancel Mechanism
If any of the following signals is input during cruise control travelling, the cruise control is cancelled.
∗ Depressing the clutch pedal (Cruise control clutch SW off). "Signal is not input to TERMINAL D of the ECU" (M/T)
∗ Placing the shift lever to positions except "D" position (Park/Neutral position SW except "D" position) (A/T)
∗ Pushing the CANCEL SW (CANCEL SW on). "Signal input to TERMINAL CCS of the ECU"
∗ Pushing the CRUISE SW off "signal input to TERMINAL CCS of the ECU".
∗ Depressing the brake pedal (Stop light SW on)
7. Tap–Up Control Function
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 1.6 km/h (1 mph) each time by operating the +RES SW quickly within 0.6 seconds.
8. Tap–Down Control Function
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 1.6 km/h (1 mph) each time by operating the –SET SW quickly within 0.6 seconds.
9. Auto Cancel Function
A) If any of the following operating conditions occurs during cruise control operation, the set speed is erased and the cruise
control is released, (CRUISE SW turns off).
When this occurs, the ignition SW must be turned off once before the CRUISE SW will turn on.
∗ When abnormality is found in the stop light SW input circuit.
∗ When abnormality is found in the cancel circuit.
B) If any of the following operating conditions occurs during cruise control operation, the set speed is erased and the cruise
control is released. (CRUISE SW turn off).
When this occurs, the cancel state is cleared as the CRUISE SW will turn on again.
∗ When abnormality is found in electronic throttle parts.
∗ Open circuit in the stop light SW.
∗ Momentary interruption of vehicle speed signal.
∗ Short circuit in the stop light SW.
YARIS (EM01V0U)
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