GMC Terrain 2017 Owner's Manual page 82

2.2. Route, attach and tighten
the top tether according
to your child restraint
instructions and the
following instructions:
If the position you are using
does not have a headrest
or 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 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 your are
using a dual tether, raise
the headrest or head
Seats and Restraints
restraint and route the
tether under the headrest or
head restraint and around
the headrest or head
restraint posts.
If the position being used
has a fixed headrest or
head restraint and a single
tether is being used, 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
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