Toyota Prius 2011 Manual page 45

Back door (vehicles with entry function of front and back doors)
1-2. Key information
Press the unlock button to
unlock the doors.
The door cannot be unlocked for
3 seconds after the door is
locked.
Lock the back door again when
you leave the vehicle. The back
door will not lock automatically
after it has been opened and then
closed.
Press the lock button to lock the
doors.
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