Chevrolet Impala 2014 Owner's Manual page 105

If the position you are using
does not have a head
restraint and you are using
a single tether, route the
tether over the seatback.
If the position you are using
does not have a head
restraint and you are using
a dual tether, route the
tether over the seatback.
If the position you are using
has an adjustable head
restraint and you are using
a single tether, route the
tether under the head
restraint and in between the
head restraint posts.
Seats and Restraints
If the position you are using
has an adjustable head
restraint and you are using
a dual tether, route the
tether under the head
restraint and around the
head restraint posts.
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.
3-47