Cadillac 2008 STS Owner's Manual page 47

2.4. 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.
3. Push and pull the child restraint in different
directions to be sure it is secure.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a
dual tether, route the tether
under the head restraint
and in between the
head restraint posts.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a
single tether, route the
tether under the headrest
or head restraint and
in between the headrest or
head restraint posts.
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