Savaria Toyota Sienna Owner's Manual page 28

Flipping the seat down (from the driver's side):
1. Place one hand on the top of the seat, and one hand on the black
release handle. Push the seat inward slightly, and then pull the
release handle outward all the way. Flip the seat down with a
generous amount of force.
2. Check to make sure the locking pin is all the way through the hole
at the back (see below). If the pin is not through the hole, pull the
seat back up and push it down once again with more force. Repeat
as necessary. If further assistance is required, contact Savaria®
Vehicle Group.
3. Raise the backrest and headrest.
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3
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2
The pin must be fully engaged in
the "down and locked" position
before it is used by a passenger.
If the vehicle is driven with an
occupant sitting in a flip seat which
is not locked, serious injury or death
may result.