Pontiac G6 2009 Owner's Manual page 53

Sedan Models
If you need to secure more than one child restraint in the
rear seat, see Where to Put the Restraint on page 1-42.
Depending on where you place the child restraint, you
may not be able to access certain safety belt assemblies
or LATCH anchors for additional passengers or child
restraints.
You cannot secure three child restraints using the
LATCH anchors in the rear seat at the same time, but
you can install two of them. If you want to do this, install
one LATCH child restraint in the passenger-side position,
and install the other one either in the driver's-side position
or in the center position. Refer to the following illustration
to learn which anchors to use.
A. Passenger's Side Rear Seat Lower Anchors
B. Center Rear Seat Lower Anchors
C. Driver's Side Rear Seat Lower Anchors
Make sure to attach the child restraint at the proper
anchor location.
This system is designed to make installation of child
restraints easier. When using lower anchors, do not use
the vehicle's safety belts. Instead, use the vehicle's
anchors and child restraint attachments to secure the
restraints. Some restraints also use another vehicle
anchor to secure a top tether.
Sedan
1-49