Cadillac 2009 CTS Owner's Manual page 54

1-48
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 tether,
route the tether around
the head restraint.
3. Push and pull the child restraint in different
directions to be sure it is secure.
If the position you are
using has a fixed head
restraint and you are using
a single tether, route the
tether over the head
restraint.