2008 GMC Acadia Owner's Manual - Page 58

2. If the child restraint manufacturer recommends that the top tether be attached, attach and tighten the top tether to the top tether anchor, if the vehicle has one. Refer to the child restraint instructions and the following steps: 2.1. Find the top tether anchor. 2.2. If the anchor is covered, flip open the cover to expose the anchor. 2.3. Route, attach and tighten the top tether according to your child restraint instructions and the following instructions: If the position you are using does not have a headrest or head restraint and you are using a single tether, route the tether over the seatback. If the position you are using does not have a headrest or head restraint and you are using a dual tether, route the tether over the seatback. If the position you are using has a fixed headrest or head restraint and you are using a dual tether, route the tether around the headrest or head restraint. 1-54