Cadillac 2003 CTS Owner's Manual page 317

Removing Wheel Covers and Wheel Nut
Caps (If Equipped)
If your vehicle has wheel covers, use the flat end of the
wheel wrench to remove the covers. Turn the wheel
wrench clockwise to gently pry off the wheel cover.
Be careful not to scratch the aluminum wheel edge and
don't try to remove the wheel cover with your hands.
5-22
If your vehicle has wheel nut caps, turn the wheel
wrench counterclockwise to remove the caps.
If your vehicle has 17 inch (43.2 cm) wheels, there is a
center cap that does not need to be removed in order to
remove the wheel from the vehicle.