Toyota 2005 Sienna Owner's Manual page 98

STOWING THIRD SEATS
1. Lower the head restraint to the low-
est position.
90
05 SIENNA_U (L/O 0409)
2. Pull the seatback angle adjusting
strap ("TO FOLD/LIFT SEATBACK"
printed on its surface), then fold
down the seatback.
2005 SIENNA from Sep. '04 Prod. (OM45431U)