TOYOTA 2010 Sienna - Manual (Page 109)

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1-3. Adjustable components (seats, mirrors, steering wheel)
Head restraints
Head restraints are provided for all seats.
Front seats
Vertical adjustment
Up
Pull the head restraints up.
Down
Push the head restraint down
while pushing the lock release
button.
Second seats
Vertical adjustment
Up
Pull the head restraints up.
Down
Push the head restraint down
while pushing the lock release
button.
Third seats
Vertical adjustment
Up
Pull the head restraints up.
Down
Push the head restraint down
while pushing the lock release
button.
Lock release button
Lock release button
Lock release button