GMC Acadia 2012 Owner's Manual page 105

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.
Seats and Restraints
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.
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