TOYOTA 2010 Yaris - Manual (Page 66)

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1-3. Adjustable components (seats, mirrors, steering wheel)
■ Removing the head restraints
Front seats
Rear seats (non-split rear seat)
Vertical adjustment
Up
Pull the head restraints up.
Down
Push the head restraints down
while pushing the lock release
button.
Lock release button
Pull the head restraint up while pushing
the lock release button.