Toyota 2011 Avalon Quick Reference Manual page 159

1-7. Safety information
Removing a child restraint installed with a seat belt
Child restraint systems with a top tether strap
132
AVALON_U (OM41428U)
Push the buckle release button
and fully retract the seat belt.
Secure the child restraint using a
seat belt or LATCH anchors, and
lock the head restraint in place at
the lowest position.
Open the anchor bracket cover,
latch the hook onto the anchor
bracket and tighten the top tether
I n f o r ma t i o n P r o v i d e d b y :
strap.
Make sure the top tether strap is
securely latched.