Cadillac 2005 STS - Manual (Page 20)

5. To make the lap part tight, pull down on the buckle
end of the belt as you pull up on the shoulder belt.
6. This safety belt has a feature that will reduce the
tension of the safety belt on the occupant’s
shoulder. To set this feature, gently pull on the belt,
or lean forward and then sit back. The belt will
retract and rest lightly against the occupant.
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 would 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 is a sudden stop or crash,
or if you pull the belt very quickly out of the retractor.
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