GMC Cadillac CTS 2004 Owner's Manual page 378

Removing Wheel Covers and
Wheel Nut Caps
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.
5-84
If your vehicle has wheel nut caps, turn the wheel
wrench counterclockwise to remove the caps.