On Mode
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Test the on mode by connecting a separate set of test leads from battery ground (-) post to windshield wiper motor (4) component side pins 6 and 7 (6). When these pins are grounded, the rear window wiper motor operation should now be in on mode.