Mercury 1996 Sable Manual page 21

the safety belt will become locked and help
reduce your forward movement.
To unfasten the belt, push the red release button
on the end of the buckle. This allows the tongue
to unlatch from the buckle. While the belt
retracts, guide the tongue to its original position
to prevent it from striking you or the vehicle.
Unfastening the combination lap and shoulder belts for the
rear-facing third seat (wagon)
Center Occupant Rear Safety Belt (Sedan)
The safety belt in the center rear seating position
has a detachable shoulder belt.
To attach the shoulder belt to the lap belt, pull
the shoulder belt out from the retractor in the
seatback and insert the lap belt connecting pin
into the wide end of the key-slot on the
shoulder belt as shown in Figure 1. Pull the
connecting pin into the narrow end of the
key-slot until you hear a snap and feel it latch.
See Figure 2. Make sure the shoulder belt is
securely fastened to the lap belt by pulling up
on the shoulder belt.
18