Wiper/Washer Switch
Section 01-16: Wiper and Washer Systems | 1996 F-150, F-250, F-350, F-Super Duty and Bronco Workshop Manual |
Testing should be done with an ohmmeter such as Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent.
Wiper/Washer Switch
| Pin Number | Circuit | Circuit Function |
|---|---|---|
| 1 | 589 (O) | Multi-Function Switch Mode |
| 2 | 15 (R/Y) | Headlamp Dimmer Switch Feed |
| 3 | 13 (R/BK) | Headlamp Dimmer Switch to Low Beams |
| 4 | 993 (BR/W) | Multi-Function Switch (Common) |
| 5 | 12 (LG/BK) | Headlamp Dimmer Switch to High Beams |
| 6 | 590 (DB/W) | Multi-Function Switch (Internal Mode) |
| 7 | 196 (DB/O) | Instrument Panel Lamps Feed |
NOTE: Terminals 1, 4 and 6 are the only ones used for this test.
| To Test | Connect Ohmmeter to Terminals | Move Switch to These Positions | A Good Switch Will Indicate: |
|---|---|---|---|
| Washer Switch Circuit | 590 (DB/W) and 993 (BR/W) | With Wiper Switch OFF: Push Washer Switch In, Release Washer Switch | Closed Circuit 103.3k ohm (± 10%) |
| Wiper Switch Circuit | 589 (O) and 993 (BR/W) | OFF Int LO HI | 47.6k ohm 11.33k ohm 4.08k ohm Closed Circuit (± 5%) |
| Interval Time Adjust | 590 (DB/W) and 993 (BR/W) | Int and OFF | Rotate control toward OFF; ohmmeter will show smoothly increasing resistance from 3.3k ohm min. to 103.3k ohm max. (± 10%) |
| LO and HI | 3.3k ohm (± 10%) |
Current Draw
Windshield Washer Pump
Attach leads of the volt-amp tester, such as Rotunda Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent. Current draw should not exceed 4 amps, or indicate less than 2 amps while the washer pump motor is pumping fluid.
Windshield Wiper Motor
CAUTION: Rough handling of a windshield wiper motor (17504) during testing or servicing can damage the field magnets. If the magnets are damaged, the wiper motor will not operate and must be replaced.
To measure wiper motor current draw, on vehicle, proceed as follows:
Disconnect windshield wiper mounting arm and pivot shaft (17566) from motor.
Disconnect wiring at wiper motor.
Connect green lead from Rotunda Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or equivalent to battery negative terminal.
Connect tester red lead to motor common brush terminal.
To measure low speed current draw, connect jumper wire from battery positive terminal to low speed brush terminal. Motor should operate and current draw should not exceed 3.5 amperes.
To measure high speed current draw, move jumper wire to high speed brush terminal. Current draw should not exceed 5.5 amperes.
Park Test
Connect a jumper lead from low speed terminal (Circuit 56 [DB/O]) of windshield wiper motor connector to park return terminal of park switch connector.
Jumper both windshield wiper motor and park switch ground terminals to battery ground cable (14301).
Connect a jumper lead from battery positive terminal to park feed terminal. Windshield wiper motor should cycle once, then stop in park position.