Toyota LEXUS LS430 2005 Manual page 191

OCCUPANT RESTRAINT SYSTEMS
16L290
To release the belt, press the buckle release button and
allow the belt to retract.
If the belt does not retract smoothly, pull it out and check for
kinks or twists. Then make sure it remains untwisted as it
retracts.
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Seat belt comfort guides
16L291B
The seat belt comfort guides are installed on the outboard
rear seats to relieve uncomfortableness from the
shoulder belt when it is applied closer to a child's neck (at
the age of 10 or so), by pulling the shoulder belt a little
forward.
Slide the seat belt comfort guide forward to adjust the
shoulder belt.
The seat belt comfort guide should not be in the forward
position for other purposes.