Low Speed
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Test the low speed mode by connecting a separate set of test leads from the battery ground (-) post to the windshield wiper motor (4) component side pins 9 and 10 (6). When these pins are grounded, the windshield wiper motor operation should now be in low speed mode.