How do I test the wiper switch circuit on a '92-up Ford multi-function switch?

Connect an ohmmeter to terminals 589 (O) and 993 (BR/W). A good switch reads 47.6K ohm in Off, 11.33K ohm in Int, 4.08K ohm in Lo, and closed circuit in Hi.

Which terminals test the washer switch circuit?

Terminals 590 (DB/W) and 993 (BR/W). With the wiper switch OFF, pushing the washer switch in should show a closed circuit; releasing it should show 103.3K ohm.

What resistance should the interval time adjust show?

With the ohmmeter on 590 (DB/W) and 993 (BR/W), rotating the control toward OFF between Int and Off should show smoothly increasing resistance from 3.3K ohm minimum to 103.3K ohm maximum; between Lo and Hi it reads 3.3K ohm.

How do I test the flash-to-pass function?

Connect the tester to 196(DB/O) and 12(LG/BK), then 15(R/Y) and 13(R/BK). Pull and hold the lever stalk toward the steering wheel; a good switch shows a closed circuit.

How do I test the hazard switch?

Connect the tester between 385(W/R) and terminals 2(W/LB), 5(O/LB), 3(LG/W), and 9(LG/O). With the hazard switch ON (button depressed then released to full out position), a good switch shows a closed circuit.

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1992-Up Ford Multi-Function Switch (MFS) Testing - Pinout, Wire Colors & Ohm Values

Multifunction switch testing circuit diagrams with wire color codes and test tables

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Multifunction switch testing diagram with color-coded circuit drawings and continuity test tables for a 92-up vehicle.

AI caption October 2005 · Photo 131 of 277

This document is a diagnostic reference titled "'92-up MFS Testing" for testing the multi-function switch (MFS) on 1992 and later Ford vehicles. It includes a connector pinout drawing of the switch identifying all terminals by circuit number and wire color: 511 (LG), 3 (LG/W), 385 (W/R), 44 (LB), 2 (W/LB), 15 (R/Y), 13 (R/BK), 12 (LG/BK), 196 (DB/O), 9 (LG/O), 5 (O/LB), 589 (O), 993 (BR/W), and 590 (DB/W). Two tables list step-by-step tests using a self-powered test light or ohmmeter. The upper table covers the washer switch circuit, wiper switch circuit (Off = 47.6K ohm, Int = 11.33K ohm, Lo = 4.08K ohm, Hi = closed circuit), and interval time adjust (3.3K to 103.3K ohm smooth sweep). The lower table covers flash-to-pass, dimmer high and low beams, left and right turn signal circuits, hazard switch, and stop lamp feed-through circuit, each of which should show a closed circuit when good. Internal schematic diagrams show the switch contact logic and internal resistor values (3.3K, 4.08K, 7.25K, 36.27K, 100K ohms) for the wiper/washer and turn/hazard/dimmer sections.

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Frequently asked questions

How do I test the wiper switch circuit on a '92-up Ford multi-function switch?: Connect an ohmmeter to terminals 589 (O) and 993 (BR/W). A good switch reads 47.6K ohm in Off, 11.33K ohm in Int, 4.08K ohm in Lo, and closed circuit in Hi.
Which terminals test the washer switch circuit?: Terminals 590 (DB/W) and 993 (BR/W). With the wiper switch OFF, pushing the washer switch in should show a closed circuit; releasing it should show 103.3K ohm.
What resistance should the interval time adjust show?: With the ohmmeter on 590 (DB/W) and 993 (BR/W), rotating the control toward OFF between Int and Off should show smoothly increasing resistance from 3.3K ohm minimum to 103.3K ohm maximum; between Lo and Hi it reads 3.3K ohm.
How do I test the flash-to-pass function?: Connect the tester to 196(DB/O) and 12(LG/BK), then 15(R/Y) and 13(R/BK). Pull and hold the lever stalk toward the steering wheel; a good switch shows a closed circuit.
How do I test the hazard switch?: Connect the tester between 385(W/R) and terminals 2(W/LB), 5(O/LB), 3(LG/W), and 9(LG/O). With the hazard switch ON (button depressed then released to full out position), a good switch shows a closed circuit.