Pontiac 2004 Vibe - Manual (Page 44)

Top Strap Anchor Location
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.
1-38