GMC 1993 Suburban Owner's Manual page 47

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 is a sudden stop
or
a crash.
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AN147030
To unlatch the belt, just push the button on the buckle.
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