2003 Buick LeSabre Owner's Manual - Page 50

In Canada; the law requires that forward-facing child restraints have a top strap, and that the strap be anchored. In the United States, some child restraints also have a top strap. If your child restraint has a top strap, it should be anchored. Anchor the top strap to one of the following anchor points. Be sure to use an anchor point located on the same side of the vehicle as the seating position where the child restraint will be placed. Once you have the top strap anchored, you'll be ready to secure the child restraint itself. Tighten the top strap when and as the child restraint manufacturer's instructions say. Your vehicle has top strap anchors already installed for the rear seating positions. You'll find them behind the rear seat on the filler panel. In order to get to a bracket, you'll have to open the trim cover. 1-43