TOYOTA 2011 Sienna - Manual (Page 167)

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1-3. Adjustable components (seats, mirrors, steering wheel)
■ Adjusting the height of the head restraints
■ Adjusting the center seat head restraints
Always raise the head restraint one level from the stowed position when
using.
■ Removing the head restraints
Make sure that the head restraints are
adjusted so that the center of the head
restraint is closest to the top of your ears.
Pull the head restraint up while pressing
the lock release button.
The head restraint of third outside seat
can not be removed.