Toyota 2013 Prius Owner's Manual page 182

CAUTION
Head restraint precautions
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Observe the following precautions regarding the head restraints. Failure to
do so may result in death or serious injury.
Use the head restraints designed for each respective seat.
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Adjust the head restraints to the correct position at all times.
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After adjusting the head restraints, push down on them and make sure
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they are locked in position.
Do not drive with the head restraints removed.
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PRIUS PHV_OM_OM47787U_(U)
1-5. Adjustable components (seats, mirrors, steering wheel)
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