Chevrolet Optra 2005 Owner's Manual page 28

Lap-Shoulder Belt
All rear seating positions have lap-shoulder belts. Here
is how to wear a lap-shoulder belt properly.
1. Pick up the latch plate and pull the belt across you.
Do not let it get twisted.
The shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.
1-22
2. Push the latch plate into the buckle until it clicks.
Be sure you are using the correct buckle and that
the latch plate clicks when inserted into the buckle.
Pull up on the latch plate to make sure it is
secure. If the belt is not long enough, see Safety
Belt Extender on page 1-24.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
3. To make the lap part tight, pull down on the buckle
end of the belt as you pull up on the shoulder part.