Pontiac 1993 Sunbird Owner's Manual page 27

Seats
&
Restraint Systems
2.
Slide the guide under and past the
belt. The elastic cord must be under
the belt. Then, place the guide over
the belt, and insert the two edges of
the belt into the slots of the guide.
E 6
3 . Be sure that the belt is not twisted
and it lies flat. The elastic cord must
be under the belt and the guide on
top.
4.
Buckle the belt around the child, and
make sure that both the lap belt and
the shoulder belt are secured
properly. Make sure that the shoulder
belt crosses the shoulder. See Safety
Belts, Rear Seat Passengers in the
Index.
To remove and store the comfort
guides, just perform these steps in
reverse order. Squeeze the belt edges
together so that you can take them out
from the guides. Pull the guide upward
to expose its storage clip, and then slide
the guide onto the clip. Rotate the guide
and clip inward and in between the seat
back and the interior body, leaving
only
the loop of elastic cord exposed.