Cadillac STS 2011 Owner's Manual page 449

3. Find the vehicle's jacking location using the
diagram above and corresponding V shaped
notches located in the plastic molding on the
vehicle's frame. The notches in the plastic molding
are marked with a triangle shape.
4. Attach the wheel wrench to the jack.
6-98
WARNING:
Getting under a vehicle when it is jacked up is
dangerous. If the vehicle slips off the jack, you
could be badly injured or killed. Never get under a
vehicle when it is supported only by a jack.
WARNING:
Raising your vehicle with the jack improperly
positioned can damage the vehicle and even
make the vehicle fall. To help avoid personal
injury and vehicle damage, be sure to fit the jack
lift head into the proper location before raising the
vehicle.