2012 Toyota Prius Owners Manual - Page 404

1-4. Adjustable components (seats, mirrors, steering wheel) Power seat (if equipped for driver's seat) Seat position switch adjustment Seatback angle adjustment switch Seat cushion (front) angle adjustment switch Vertical height adjustment switch Lumbar support adjustment switch Active head restraints When the occupant's lower back presses against the seatback during a rear-end collision, the head restraint moves slightly forward and upward to help reduce the risk of whiplash on the seat occupant. 100