Pontiac 2006 Vibe Owner's Manual page 49

3. Buckle the belt. If the buckle does not click, check
to be sure that you are using the correct buckle.
The buckle for the center rear passenger position
has the word CENTER on it.
Make sure the release button is positioned so you
would be able to unbuckle the safety belt quickly
if you ever had to.
4. Pull the rest of the shoulder belt all the way out of
the retractor to set the lock.
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