Pontiac 1998 Grand Prix Owner's Manual page 46

With this built-in child restraint, you can adjust the
height of the harness. Depending on the seated height
of the child, you can route it through the upper pair of
slots (A), the middle pair of slots (B) or the lower pair
of slots (C).
@
Which slots should I use for my child?
A:
With the child seated on the child restraint cushion,
use the pair of slots that is at or just above the top
of the child's shoulders.
I
For the child shown here, the harness should go through
the middle pair of slots (B).
1-39