2001 Buick Century Owner's Manual - Page 66

D If your vehicle doesn't have the child restraint locking feature on the shoulder belt retractor, tighten the belt by pulling up on the shoulder belt while you push down on the child restraint. You may find it helpful to use your knee to push down on the child restraint as you tighten the belt. D If your vehicle has the child restraint locking feature on the shoulder belt retractor, pull the rest of the shoulder belt all the way out of the retractor to set the lock. To tighten the belt, feed the shoulder belt back into the retractor while you push down on the child restraint. You may find it helpful to use your knee to push down on the child restraint as you tighten the belt. 6. Push and pull the child restraint in different directions to be sure it is secure. 1-54