Cadillac CTS - Manual (Page 391)

4. Lift the wiper blade assembly up so it is in a
T-shaped position. You should be able to
see a tab.
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.
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.
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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