Savaria Toyota Sienna Owner's Manual page 20

5. Press the black "lock" button on the black control box.
6. Unlock the wheelchair and guide the wheelchair occupant into the
van, pulling back as you go to take up slack as the webbing spools
in the retractor. Failure to tighten the webbing in this manner may
result in the wheelchair user rolling back a few inches when the
vehicle is in motion.
7. When the wheelchair passenger is in the desired location, lock the
wheelchair.
8. Secure the Q'Straint Slide 'N Click rear retractors to the discs fixed to
the floor (please refer to section 3.2.4 for instructions).
9. Connect the Occupant Restraint System (please refer to section 3.3
for instructions).
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lock
unlock