Lexus LS 600h L 2012 Owner's Manual page 169

1-8. Safety information
Installing child restraints using a seat belt (child restraint lock function belt)
Rear-facing  Infant seat/convertible seat
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STEP 1
STEP 2
STEP 3
166
Place the child restraint system on
the rear seat facing the rear of the
vehicle.
Run the seat belt through the child
seat and insert the plate into the
buckle. Make sure that the belt is
not twisted.
Fully extend the shoulder belt and
allow it to retract to put it in lock
mode. In lock mode, the belt can-
not be extended.