Toyota Prius V 2012 Quick Reference Manual page 262

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Cruise control can be set when
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The shift position is in D.
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Vehicle speed is above approximately 25 mph (40 km/h).
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Accelerating after setting the vehicle speed
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The vehicle can be accelerated normally. After acceleration, the set
speed resumes.
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Even without canceling the cruise control, the set speed can be
increased by first accelerating the vehicle to the desired speed and then
pushing the lever down to set the new speed.
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Automatic cruise control cancelation
Cruise control will stop maintaining the vehicle speed in any of the following
situations.
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Actual vehicle speed falls more than approximately 10 mph (16 km/h)
below the preset vehicle speed.
At this time, the memorized set speed is not retained.
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Actual vehicle speed is below approximately 25 mph (40km/h).
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Enhanced VSC is activated.
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If the cruise control indicator light comes on in yellow
Press the "ON-OFF" button once to deactivate the system, and then press
the button again to 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.
PRIUS v_U (OM47674U)
2-4. Using other driving systems
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