Pontiac G6 2009 Owner's Manual page 51

Sedan Coupe
Retractable hardtop models do not have top tether
anchors to be used to secure a child restraint in any
seating position.
Do not secure a child restraint in a position without a top
tether anchor 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.
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 1-42 for
additional information.
1-47