Chevrolet 2007 Colorado Owner's Manual page 38

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 43.
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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The lap part of the belt should be worn low
and snug on the hips, just touching the thighs.
In a crash, this applies force to the strong pelvic
bones. And you would be less likely to slide
under the lap belt. If you slid under it, the
belt would apply force at your abdomen.