Cadillac 2007 STS Owner's Manual page 420

STS-V models will automatically move the
windshield wipers to the park position if the hood
is open. Make sure the hood is closed before
replacing your windshield wiper blades.
To replace the wiper blade assembly, do the
following:
1. Pull the windshield wiper assembly away from
the windshield.
2. Squeeze the tabs on each side of the wiper
blade assembly and slide the assembly off
the end of the wiper arm.
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3. Replace the blade assembly with a new one.
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.
4. Repeat the steps for the other wiper.