Pontiac 2002 Firebird - Manual (Page 35)

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Lap - Shoulder Belt
1. Pick up the latch plate and pull the belt across you.
Don’t let it get twisted.
On convertible models, 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.
2. Push the latch plate into the buckle until it clicks.
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.
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.