2011 Toyota Sienna Owners Manual - Page 288

1-7. Safety information STEP 3 Adjust the head restraint to the downmost lock position. Child restraint systems with a top tether strap (third seat) STEP 1 Secure the child restraint system using the seat belt or LATCH anchors. Adjust the head restraint to the uppermost position. STEP 2 Latch the hook onto the anchor bracket and tighten the top tether strap. Make sure the top tether strap is securely latched. 194