Pontiac 2003 Vibe - Manual (Page 50)

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Anchor the top strap to one of the top strap anchors.
Your vehicle has top strap anchors for the rear seating
positions. You will find three top strap anchors in a
covered compartment on the floor of the rear cargo area.
To access the anchors, open the compartment doors
marked with the child restraint anchor symbol. Choose
the anchor that corresponds to 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.