Lexus RX450h Owners Book page 150

1-8. Safety information
Removing a child restraint installed with a seat belt
Child restraint systems with a top tether strap
STEP 1
STEP 2
150
Press the buckle release button
and fully retract the seat belt.
Secure the child restraint system
using a seat belt or the lower
anchors, and remove the head
restraint.
Open the anchor bracket cover,
latch the hook onto the anchor
bracket and tighten the top tether
strap.
Make sure the top tether strap is
securely latched.