Savaria Toyota Sienna Owner's Manual page 21

Deboarding the Wheelchair Passenger:
1. Disconnect the Occupant Restraint System.
2. Remove the rear retractors. Don't forget to press the red release
button on the rear retractor to release the lock and provide slack in
the webbing.
3. Press the red "unlock" button on the black control box.
4. Unlock the wheelchair and push it slightly forward to release
tension in the webbing.
5. Guide the wheelchair passenger out of the van and down the ramp.
6. Lock the wheelchair.
7. Remove the webbing hooks from the front of the wheelchair frame
and reattach them to the D-rings on the rear panels.
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