GMC 1994 Yukon Owner's Manual page 39

Center Passenger Position
Lap Belt
If
your vehicle has front and rear bench seats, someone can sit in the center
positions.
1-27
When you sit in a
center seating
position,
you
have a
lap safety belt, which
has no retractor.
To
make the belt longer,
tilt the latch plate and
pull it along the belt.