Toyota Sienna 2010 Owner's Manual page 85

1-3. Adjustable components (seats, mirrors, steering wheel)
Adjusting the height of the belt (front seats)
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Center third seat belt
The center third seat belt is a 3-point type restraint with 2 buckles.
Both seat belt buckles must be correctly located and securely latched
for proper operation.
86
Down
Up
Move the height adjuster up
and down as needed until you
hear a click.
Make sure that the buckle
securely latched for ready use of
the center seat belt.
Matches the tab with the
hooked end.
Matches the tab with the con-
cave end.
is