Pontiac G3 2010 Owner's Manual page 76

Hatchback models may have zippers over the lower
anchor areas. If so, unzip the seat cover below the
labels to access each lower anchor.
2-46
To assist you in locating
the top tether anchors, the
top tether anchor symbol
is located on the cover.
For sedan models, the top tether anchors are located
under the covers behind the rear seat on the filler panel.
Pull open the cover to access the top tether anchors.
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.
Sedan