Cadillac 2001 Catera Owner's Manual page 58

In Canada, the law requires that forward
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.
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.
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facing child Anchor the top strap to one of these 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. Raise the head restraint
and route the top strap under it.
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.