Lexus LX 470 1998 Owner's Manual page 131

COMFORT ADJUSTMENT
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2. While pressing the convertible seat firmly against the seat
cushion and seatback, tighten the lap belt by pulling its free end to
hold the convertible seat securely.
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CAUTION
Push and pull the child restraint system in different directions
to be sure it is secure. Follow all the installation instructions
provided by its manufacturer.