Lexus GS300 1998 Owner's Manual page 141

COMFORT ADJUSTMENT
The seat belt length automatically adjusts to your size and the
seat position.
The retractor will lock the belt during a sudden stop or on
impact. It also may lock if you lean forward too quickly. A
slow, easy motion will allow the belt to extend, and you can
move around freely.
When a passenger's shoulder belt is completely extended and
is then retracted even slightly, the belt is locked in that
position and cannot be extended. This feature is used to hold
the child restraint system securely. (For details, see "Child
restraint" on page 157.) To free the belt again, fully retract the
belt and then pull the belt out once more.
If the seat belt cannot be pulled out of the retractor, firmly pull
the belt and release it. You will then be able to smoothly pull
the belt out of the retractor.
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