Chevrolet 2008 Aveo Owner's Manual page 32

4. Push the latch plate into the buckle until it clicks.
If you find that the latch plate will not go fully into
the buckle, see if you are using the correct buckle.
1-28
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 1-31.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if necessary.
5. If equipped with a shoulder belt height adjuster,
move it to the height that is right for you. Improper
shoulder belt height adjustment could reduce
the effectiveness of the safety belt in a crash.
See "Shoulder Belt Height Adjustment" later in
this section.