TOYOTA 2010 Prius - Manual (Page 171)

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1-8. Safety information
Child restraint systems with a top tether strap
Secure the child restraint system using a seat belt or lower
anchors, and do the following.
Outside (foldable type)
Adjust the head restraint to the
upmost position.
Outside (non-foldable type)
Remove the head restraint.
Center
Adjust the head restraint to the
upmost position.
STEP 1