Toyota PRIUS ALPHA 2012 Quick Reference Manual page 185

1-8. Safety information
STEP 3
STEP 4
STEP 5
If the child restraint has a top tether strap, the top tether strap
should be latched onto the top tether strap anchor. (→P. 172)
170
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.
While pushing the child restraint
system into the rear seat, allow
the shoulder belt to retract until
the child restraint system is
securely in place.
After the shoulder
retracted to a point where there is
no slack in the belt, pull the belt to
check that it cannot be extended.
belt has