2011 Toyota Corolla Owners Manual - Page 133
2011 Toyota Corolla Manual
Page 133 highlights
1-7. 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.