Chevrolet LUMINA 2001, Owner'S Manual, Page: 42 / 317

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If the belt stops before it reaches the buckle, tilt the
latch plate and keep pulling until you can buckle it.
Pull up on the latch plate to make sure it is secure.
On some vehicles, 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” at the end of this
section. 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.