GMC 2005 Savana - Manual (Page 28)

To unlatch the belt, just push the button on the buckle.
The belt should go back out of the way.
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.
Shoulder Belt Height Adjustment
Before you begin to drive, move the shoulder belt
adjuster to the height that is right for you.
To move it down, pull on the center adjuster control
labeled PULL. You can move the adjuster up just
by pushing up on the shoulder belt guide.
After you move the adjuster to where you want it, try to
move it down without pushing in to make sure it has
locked into position.
Adjust the height so that the shoulder portion of the belt is
centered on your shoulder. The belt should be away from
your face and neck, but not falling off your shoulder.
1-22