2011 Chevrolet Aveo Owner's Manual - Page 104

3-54 Seats and Restraints 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 headrest or head restraint and you are using a dual tether, route the tether under the headrest or head restraint and in between the headrest or head restraint posts. 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.