2011 Chevrolet Express 1500 Cargo Owner's Manual - Page 105

Seats and Restraints 2.3. Route and tighten the top tether according to your child restraint instructions and the following instructions: 3-57 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 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 integrated headrest or head restraint and you are using a dual tether, route the tether around the headrest or head restraint.