Shoulder Belt Height Adjustment - GMC 2007 Yukon Denali Owner's Manual

To unlatch the belt, 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.
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. Improper shoulder belt height
adjustment could reduce the effectiveness of the
safety belt in a crash.
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 squeezing the
buttons to make sure it has locked into position.
To move it down,
squeeze the buttons (A)
on the sides of the
height adjuster
and move the height
adjuster to the desired
position.