Cadillac 2009 CTS Owner's Manual page 368

4. Lift up the wiper blade assembly cap.
5. Pull the wiper blade assembly down far enough to
release it from the J-hooked end of the wiper arm.
Slide the assembly away from the arm.
Allowing the wiper blade arm to touch the windshield
when no wiper blade is installed could damage the
windshield. Any damage that occurs would not be
covered by your warranty. Do not allow the wiper
blade arm to touch the windshield.
6. Replace the blade with a new one.
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7. Reinstall the wiper blade assembly by sliding it over
the wiper arm to engage the J-hooked end. Pull up
on the assembly to lock it into place.
8. Repeat the steps for the other wiper.