Toyota 2015 Prius Owner's Manual page 170

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
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Place the child restraint system
on the rear seat facing the rear
of the vehicle.
Run the seat belt through the
child restraint system and insert
the plate into the buckle. Make
sure that the belt is not twisted.
Fully extend the shoulder belt
and then allow it to retract
slightly in order to activate the
ALR lock mode.
Lock mode allows the seat belt to
retract only.
I n f o r ma t i o n P r o v i d e d b y :