TOYOTA 2010 Yaris - Manual (Page 171)

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2-4. Using other driving systems
■ Cruise control can be set when
● The shift lever is in D or 3 (vehicles with an automatic transmission).
● Vehicle speed is above approximately 25 mph (40 km/h).
■ Accelerating
The vehicle can be accelerated normally. After acceleration, the set speed
resumes.
■ Automatic cruise control cancellation
The set speed is automatically canceled in any of the following situations.
● Actual vehicle speed falls more than 10 mph (16 km/h) below the preset
vehicle speed.
At this time, the memorized set speed is not retained.
● Actual vehicle speed is below 25 mph (40 km/h).
● VSC is activated.
■ If the cruise control indicator flashes
Press the ON-OFF button to turn the cruise control off, and then reactivate
the system.
If the cruise control speed cannot be set or if the cruise control cancels
immediately after being activated, there may be a malfunction in the cruise
control system. Have the vehicle inspected by your Toyota dealer.