Toyota Lexusc Owner's Handbook Manual page 261

OCCUPANT RESTRAINT SYSTEMS
1. Sit the child on a booster seat. Run the lap and shoulder belt
through or around the booster seat and child following the
instructions provided by its manufacturer and insert the tab into
the buckle taking care not to twist the belt.
Make sure the shoulder belt is correctly across the child's
shoulder and that the lap belt is positioned as low as possible
on child's hips. See "Seat belts" on page 172 for details.
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CAUTION
D Always make sure the shoulder belt is positioned
across the center of child's shoulder. The belt should
be kept away from child's neck, but not falling off
child's shoulder. Otherwise, the child may be killed
or seriously injured in case of sudden braking or a
collision.
D Both high-positioned lap belts and loose-fitting
belts could cause death or serious injuries due to
sliding under the lap belt during a collision or other
unintended event. Keep the lap belt positioned as
low on a child's hips as possible.
D For child's safety, do not place the shoulder belt
under child's arm.
D After inserting the tab, make sure the tab and buckle
are locked and that the lap and shoulder portions of
the belt are not twisted.