Lexus RX400h2006 Owner's Manual page 262

3. While pressing the convertible seat firmly against the seat
cushion and seatback, let the shoulder belt retract as far as it
will go to hold the convertible seat securely.
OCCUPANT RESTRAINT SYSTEMS
CAUTION
Push and pull the child restraint system in different
directions to be sure it is secure.
installation instructions provided by its manufacturer.
Follow all the
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