Which terminals are used for the windshield wiper switch continuity test?

Per the document's note, terminals 1, 2 and 3 are the only ones used for this test, even though the illustration shows terminals 1 through 7.

What resistance should I see with the wiper switch in the OFF position?

With Wiper OFF, resistance from pin 2 to pin 1 should be 103.3 K ohms, and with Wash OFF, resistance from pin 2 to pin 3 should be 47.6 K ohms.

What are the readings for Wiper HI?

With Wiper HI and Wash OFF: resistance pin 2 to pin 1 should be 3.3 K ohms, and pin 2 to pin 3 should read closed (continuity).

How does the interval (delay) setting affect the resistance readings?

At Wiper Interval MAX Delay (closest to OFF) through MIN Delay (closest to LO), resistance pin 2 to pin 3 is 11.33 K ohms, and resistance pin 2 to pin 1 decreases linearly from 103.3 K ohms to 3.3 K ohms.

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Ford Taurus Windshield Wiper Switch Test - Continuity & Resistance by Pin

Windshield wiper switch continuity test page with terminal illustration and resistance-by-pin table

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Service procedure for the windshield wiper switch test, showing the terminal diagram and a continuity resistance table by pin.

AI caption December 2004 · Photo 48 of 117

This service procedure document describes the Windshield Wiper Switch Test, used to diagnose problems with the turn signal/windshield wiper switch (multi-function switch) and wiper/washer switch circuits. It instructs the technician to use an ohmmeter such as the Rotunda Digital Volt Ohmmeter 007-00001 or equivalent. An illustration (K19508-A) shows the switch assembly with connector terminals labeled 1 through 7, though a note states that only terminals 1, 2, and 3 are used for this test. The main content is the Windshield Wiper Switch Continuity Test table, listing expected resistance values by pin number for each switch position: Wash OFF (3.3 K ohms pin 2 to pin 1), Wash ON (closed pin 2 to pin 1), Wiper OFF (103.3 K ohms pin 2 to pin 1; 47.6 K ohms pin 2 to pin 3), interval wiper delay range (11.33 K ohms pin 2 to pin 3, with pin 2 to pin 1 decreasing linearly from 103.3 K to 3.3 K ohms as delay is reduced), Wiper LO (3.3 K ohms pin 2 to pin 1; 4.08 K ohms pin 2 to pin 3), and Wiper HI (3.3 K ohms pin 2 to pin 1; closed pin 2 to pin 3). This allows bench-testing the switch for correct operation.

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Frequently asked questions

Which terminals are used for the windshield wiper switch continuity test?: Per the document's note, terminals 1, 2 and 3 are the only ones used for this test, even though the illustration shows terminals 1 through 7.
What tool is needed to perform the wiper switch test?: Testing should be done with an ohmmeter, such as the Rotunda Digital Volt Ohmmeter 007-00001 or equivalent.
What resistance should I see with the wiper switch in the OFF position?: With Wiper OFF, resistance from pin 2 to pin 1 should be 103.3 K ohms, and with Wash OFF, resistance from pin 2 to pin 3 should be 47.6 K ohms.
What are the readings for Wiper HI?: With Wiper HI and Wash OFF: resistance pin 2 to pin 1 should be 3.3 K ohms, and pin 2 to pin 3 should read closed (continuity).
How does the interval (delay) setting affect the resistance readings?: At Wiper Interval MAX Delay (closest to OFF) through MIN Delay (closest to LO), resistance pin 2 to pin 3 is 11.33 K ohms, and resistance pin 2 to pin 1 decreases linearly from 103.3 K ohms to 3.3 K ohms.