Buick 1993 LeSabre Owner's Manual page 40

Right Front Passenger Position
The right front passenger's safety belt works the same
way as the driver's safety belt. See "Driver Position,"
earlier in this part.
When the lap portion
of
the belt is pulled out all the
way,
it
will lock. If it does, let it go back all the way and
start again.
Be sure to use the correct buckle when buckling your
lap-shoulder belt. If you find that the latch plate will not
go fully into the buckle, see if you are using the buckle
for the center passenger position.
Center Passenger Position
n
38