Toyota 2015 Prius Owner's Manual page 65

Back door (vehicles with entry function of front and back doors)
PRIUS_OM_OM47A17U_DVD_(U)
1-3. Opening, closing and locking the doors
Press the unlock button to
unlock all the doors.
The doors cannot be unlocked for
3 seconds after the doors are
locked.
Press the lock button to lock all
the doors.
Check that the door is securely
locked.
Check to see that all the side
doors and back door are securely
locked.
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