Oldsmobile 2001 Aurora - Manual (Page 58)

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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.
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.