GMC 2015 Canyon Owner's Manual page 91

3-44 Seats and Restraints
3.3. Route the top tether
according to your child
restraint instructions and
the following instructions:
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
has a fixed head restraint
and you are using a single
tether, route the tether
around the inboard or
outboard side of the head
restraint.
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 a fixed head restraint
and you are using a dual