2008 GMC Acadia Owner's Manual - Page 59

If the position you are using has a fixed headrest or head restraint and you are using a single tether, route the tether over the headrest or head restraint. Securing a Child Restraint in a Rear Seat Position When securing a child restraint in a rear seating position, study the instructions that came with your child restraint to make sure it is compatible with this vehicle. If your child restraint has the LATCH system, see Lower Anchors and Tethers for Children (LATCH) on page 1-47 for how to install your child restraint using LATCH. If you secure a child restraint using a safety belt and it uses a top tether, see Lower Anchors and Tethers for Children (LATCH) on page 1-47 for top tether anchor locations. Do not secure a child seat in a position without a top tether anchor if a national or local law requires that the top tether be anchored, or if the instructions that come with the child restraint say that the top strap must be anchored. In Canada, the law requires that forward-facing child restraints have a top tether, and that the tether be attached. If your child restraint does not have the LATCH system, you will be using the safety belt to secure the child restraint in this position. Be sure to follow the instructions that came with the child restraint. Secure the child in the child restraint when and as the instructions say. 3. Push and pull the child restraint in different directions to be sure it is secure. 1-55