Shoulder Belt Height Adjustment - Chevrolet 2005 Astro Owner's Manual

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.
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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, push it in at the top of the arrows
and move the height adjuster to the desired position.
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
it 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.