Cadillac SRX Owner's Manual page 54

2. If the child restraint manufacturer recommends that
the top tether be attached, attach and tighten the
top tether to the top tether anchor, if equipped.
Refer to the child restraint instructions and
the following steps:
2.1. Find the top tether anchor.
2.2. If you have an adjustable headrest or head
restraint, raise the headrest or head restraint.
2.3. Route, attach and tighten the top tether
according to your child restraint instructions
and the following instructions:
1-48
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 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.