Toyota 2009 4runner Owner's Manual page 153

1-7. Safety information
Child restraint systems with a top tether strap
Vehicles without third seats
126
Secure the child restraint using
the LATCH anchors or seat belt,
and remove the head restraint.
Raise the anchor bracket, latch
the hook onto the anchor bracket
and tighten the top tether strap.
Make sure the top tether strap is
securely latched.
Hook
Top tether strap
Anchor bracket