Toyota Sienna 2010 Owner's Manual page 149

1-7. Safety information
STEP 2
STEP 3
STEP 4
If the child restraint has a top tether strap, the top tether strap
STEP 5
should be latched onto the top tether strap anchor.
(→P. 152, 153)
150
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 strap
and then allow it to retract
slightly into the ALR lock mode.
Lock mode allows the seat belt to
retract only.
While pushing the child seat into
the rear seat, allow the shoulder
belt to retract until the child seat
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