Lexus GS430 User Manual page 212

OCCUPANT RESTRAINT SYSTEMS
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3. While pressing the infant seat firmly against the seat
cushion and seatback, let the shoulder belt retract as far as it
will go to hold the infant seat securely.
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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