GMC 1994 Sonoma Owner's Manual page 38

Securing a Child Restraint in the Center Front Seat
Position (Bench Seat
-
Except 60/40 Bench Seat)
Don't use child restraints in the center position of a 60/40 bench seat.
When you secure a child restraint in a center seating position, you'll be
using the lap belt.
See the earlier section about the top strap if the child restraint has one.
1. Make the belt as
long as possible
by tilting the
latch plate and
pulling it along
the belt.
2.
3.
4.
Put the restraint on the seat. Follow the instructions for the child
restraint.
Secure the child in the child restraint as the instructions say.
Run the vehicle's safety belt through or around the restraint. The child
restraint instructions will show you how.