TOYOTA 2010 Prius - Manual (Page 71)

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1-2. Key information
Unlocking and locking the doors
Front door handles (including front passenger door handle if
equipped with entry function)
Grip the handle to unlock the
door.
Make sure to touch the sensor on
the back of the handle.
The door cannot be unlocked for
3 seconds after the door is
locked.
Touch the sensor area to lock the
doors.