Toyota 2008 Prius Quick Reference Manual page 96

Adjusting the height of the belt (front seats)
n
Seat belt pretensioners (front seats)
PRIUS_U_(L/O_0802)
1-4. Adjustable components (seats, mirrors, steering wheel)
Down
Up
Move the height adjuster up
and down as needed until you
hear a click.
The pretensioner helps the seat
belt to quickly restrain the occu-
pant by retracting the seat belt
when the vehicle is subjected to
certain types of severe frontal
collision.
The pretensioner may not acti-
vate in the event of a minor frontal
impact, a side impact or a rear
impact.
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