Jeep 2010 Wrangler Owner's Manual page 46

Adjusting Upper Shoulder Belt
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 45
WARNING!
Position the shoulder belt height adjusters so that the
belt rests across the middle of your shoulder. Failure
to adjust the safety belt properly could reduce the
effectiveness of the seat belt and increase the risk of
injury in a collision.
As a guide, if you are shorter than average, you will
prefer a lower position, and if you are taller than average,
you will prefer a higher position. When you release the
anchorage, try to move it up or down to make sure that
it is locked in position.
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