GM Service Manual Online
For 1990-2009 cars only

Your vehicle has a top strap anchor for each second row seating position. The anchors are located on the floor of the vehicle behind the second row seat.

Do not secure a child restraint with a top strap in the right front passenger's position or in the third row if a national or local law requires that the top strap be anchored, or if the instructions that come with the child restraint say that the top strap must be anchored. There is no place to anchor the top strap in these positions.