Toyota 2014 Sienna Manual page 109

STEP 2
Lower the seat and engage the latches.
If you locked the seat latches unintentionally before installing
securely, pull the release lever to unlock the latches.
Make sure the seat is locked in place by trying to shake the seatback
and lift up the seat cushion.
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Installing the second center seats (if equipped)
STEP 1
STEP 2
STEP 3
SIENNA_OM_OM45483U_(U)
1-3. Adjustable components (seats, mirrors, steering wheel)
Engage the rear pins with the
hooks.
Unfold the cushion leg and push
down on the seat to engage the
front lock.
Unfold the seatback and lock it.
Make sure the seat is locked in
place by trying to shake the seat-
back and lift up the seat cushion.
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