GMC C-Series 2001 Owner's Manual page 28

Bench (A) Suspension (B)
To unlatch the belt, just push the button on the buckle.
The belt should go back out of the way. For a
-
suspension type seat, if the belt is pulled out all the way
so that it locks, press down on the button on the retractor
cover to make it retract.
Before you close the door, be sure the belt is out of the
way. If you slam the door on it, you can damage both the
belt and your vehicle.
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