Toyota 2014 Sienna Manual page 128

1-3. Adjustable components (seats, mirrors, steering wheel)
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Installing the head restraints (front, second and third center seats)
CAUTION
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Head restraint precautions
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.
●
Adjust the head restraints to the correct position at all times.
●
After adjusting the head restraints, push down on them and make sure
they are locked in position.
●
Do not drive with the head restraints removed.
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Align the head restraint with the installa-
tion holes and push it down to the lock
position.
Press and hold the lock release button
when lowering the head restraint.