2011 Buick Enclave Owner's Manual - Page 107

Seats and Restraints 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 has a fixed headrest or head restraint and you are using a dual tether, route the tether around the headrest or head restraint. If the position you are using has a fixed headrest or head restraint and you are using a single tether, route the tether over the headrest or head restraint. 3. Before placing a child in the child restraint, make sure it is securely held in place. To check, grasp the child restraint at the LATCH path and attempt to move it side to side and back and forth. There should be no more than 2.5 cm (1 in) of movement, for proper installation.