2008 GMC Envoy Owner's Manual - Page 50

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 equipped. Refer to the child restraint instructions and the following steps: 2.1. Find the top tether anchor. 2.2. Route and tighten the top tether according to your child restraint instructions and the following instructions. If your vehicle has a cargo shade, route the top tether between the seatback and the cargo shade. 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. For vehicles that have a headrest or head restraint, fold down the headrest or head restraint and route the single tether under the headrest or head restraint and in between the headrest or head restraint posts. See Rear Seat Operation on page 1-11. 1-46