Cadillac 2004 CTS Owner's Manual page 343

Notice: 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.
5. Squeeze the tab together and 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.
6. Replace the blade with a new one.
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.
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