2012 Toyota Highlander Owners Manual - Page 137
2012 Toyota Highlander Manual
Page 137 highlights
1-8. Safety information STEP 4 While pushing the child seat down into the rear seat, allow the shoulder belt to retract until the child seat is securely in place. After the shoulder belt has retracted to a point where there is no slack in the belt, pull the belt to check that it cannot be extended.