Cadillac 2005 STS Owner's Manual page 366

1. Place the wheel wrench (A) securely over the wheel
nut (B). Turn the wheel wrench counterclockwise to
loosen all the wheel nuts. Don't remove them yet.
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2. Find the jacking location using the diagram above
and corresponding hoisting notches located in the
plastic molding. The notches in the plastic molding
are marked with a triangle shape to help you
find them.