Oldsmobile 1999 Bravada - Manual (Page 49)

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Top Strap
Canadian law requires that forward - facing child
restraints have a top strap, and that the strap
be anchored.
If your child restraint has a top strap, it should be
anchored. Anchor brackets for the rear outside seat
positions are located on the floor in the cargo area.
Don’t use the front set of tie - down brackets. Anchor the
top strap to the rearmost bracket on the same side of the
vehicle as the child restraint.
Once you have the top strap anchored, you’ll be ready to
secure the child restraint itself.