Toyota Prius C 2011 Owner's Manual page 46

Unlocking and locking the doors (front door handles only)
Unlocking and locking the back door
1-3. Opening, closing and locking the doors
Grip the handle to unlock the
doors.
Make sure to touch the sensor on
the back of the handle.
The doors cannot be unlocked for
3 seconds after the doors are
locked.
Touch the lock sensor (the
indentation on the side of the
door handle) to lock the doors.
Press the button to unlock the
back door.
The door cannot be unlocked for
3 seconds after the door is
locked.
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