TOYOTA 2010 Sienna - Manual (Page 111)

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1-3. Adjustable components (seats, mirrors, steering wheel)
CAUTION
■
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.