Toyota 2015 Prius Owner's Manual page 124

Power seat (if equipped for driver's seat)
Active head restraints
PRIUS_OM_OM47A17U_DVD_(U)
1-4. Adjustable components (seats, mirrors, steering wheel)
Seat position adjustment
switch
Seatback angle adjustment
switch
Seat cushion (front) angle
adjustment switch
Vertical height adjustment
switch
Lumbar support adjustment
switch
When the occupant's lower back
presses against the seatback
during a rear-end collision, the
head restraint moves slightly for-
ward and upward to help reduce
the risk of whiplash on the seat
occupant.
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