2008 Cadillac STS Owner's Manual - Page 47

2.4. 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 has an adjustable headrest or head restraint and you are using a dual tether, route the tether under the head restraint and in between the head restraint posts. 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 an adjustable headrest or head restraint and you are using a single tether, route the tether under the headrest or head restraint and in between the headrest or head restraint posts. 3. Push and pull the child restraint in different directions to be sure it is secure. 1-43