Cadillac 2006 CTS Owner's Manual page 50

The top tether anchors are located under the trim covers
on the rear seatback filler panel. Be sure to use an
anchor located on the same side of the vehicle as the
seating position where the child restraint will be placed.
1-44
To assist you in locating
the top tether anchors, the
top tether anchor symbol is
located on the trim cover.
Do not secure a child restraint in the right front
passenger's position if a national or local law requires
that the top tether be attached, or if the instructions that
come with the child restraint say that the top tether
must be attached. There is no place to attach the top
tether in this position.
Accident statistics show that children are safer if they
are restrained in the rear rather than the front seat. See
Where to Put the Restraint on page 1-40 for additional
information.