GMC Yukon XL 2013 Owner's Manual page 122

3-64 Seats and Restraints
For passenger seating positions
with a lap-shoulder belt and a
free-falling latch plate, try to pull
the belt out of the retractor to
make sure the retractor is
locked. If the retractor is not
locked, repeat Steps 4 and 5.
6. If the child restraint has a top
tether, follow the child restraint
manufacturer's instructions
regarding the use of the top
tether. See Lower Anchors and
Tethers for Children (LATCH
System) on page 3 51 for more
information.
7. Before placing a child in the
child restraint, make sure it is
securely held in place. To check,
grasp the child restraint at the
safety belt path and attempt to
move it side-to-side and
back-and-forth. When the child
restraint is properly installed,
there should be no more than
2.5 cm (1 in) of movement.
To remove the child restraint,
unbuckle the vehicle safety belt and
let it return to the stowed position.
If the top tether is attached to a top
tether anchor, disconnect it.