2004 Toyota Sienna Owners Manual - Page 100

04 SIENNA_U (L/O 0408) -Stowing seat belt buckles of the second and third seats To release the concave end tab, insert the key into the hole on buckle 1 and allow the belt to retract. Second (7−passenger models) CAUTION Do not use the center seat belt of the third seats with either buckle released. Fastening only the shoulder belt or lap belt may cause serious personal injury in case of a sudden braking or a collision. Third 100 2004 SIENNA from Aug. '04 Prod. (OM45422U)