Cadillac 2011 Escalade Owner's Manual page 127

3-70 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 an adjustable headrest
or head restraint and you
are using a single tether,
raise the headrest or head
restraint and 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 a fixed headrest or
head restraint and you
are using a single tether,
route the tether around the
inboard or outboard side
of the headrest or head
restraint.