Cadillac 2007 STS Owner's Manual page 32

2. Push the latch plate into the buckle until
it clicks.
Pull up on the latch plate to make sure it
is secure.
When the shoulder belt is pulled out all the
way, it will lock. If it does, let it go back all the
way and start again.
If the belt is not long enough, see Safety Belt
Extender on page 37.
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 up on the
shoulder part.
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