Toyota Lexusc Owner's Handbook Manual page 199

OCCUPANT RESTRAINT SYSTEMS
2. Pinch the two edges of the shoulder belt for the rear
seat outside position with your fingers and slide the belt
past the slot of the guide as shown above. At this time, the
elastic cord must be behind the seat belt.
CAUTION
Make sure the belt is not twisted and that it lies flat. The
elastic cord must be behind the belt and the guide must
be on the front.
180
3. Buckle, position and release the seat belt. (For wearing
the seat belt, see page 175.) Make sure the shoulder belt
crosses the shoulder.