GMC 1995 Suburban Owner's Manual page 43

The lap part of the belt should be worn low and snug on the hips, just
touching the thighs. In a crash, this applies force to the strong pelvic bones.
And you'd be less likely to slide under the lap belt. If you slid under it, the
belt would apply force at your abdomen. This could cause serious or even
fatal injuries. The shoulder belt should go over the shoulder and across the
chest. These parts of the body are best able to take belt restraining forces.
The safety belt locks if there's a sudden stop or a crash.
Shoulder Belt Height Adjuster (4-Door Utility Models)
Before you begin to drive, move the shoulder belt adjuster to the height that
is right for you.
I
To move it down, push in at the word PRESS 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 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.
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