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Just replacing parts isn't the way to find the problem , viewing wiring diagrams an testing the electrical circuit with a DVOM - digital volt ohmmeter is . There are no relays involved . Do yourself a favor an take it to a qualified repair shop before you buy more parts that are not needed .
Hi Justin , Do you know what a SJB - smart junction box is and where it is located on you escape ? Windshield Wiper Operation
The smart junction box (SJB) supplies power to the multifunction switch from the SJB fuse 25 (20A) when the ignition switch is in the ON or ACC position. The multifunction switch supplies power to the windshield wiper motor for the HIGH or LOW/INTERMITTENT input, depending on the multifunction switch position selected. The SJB also supplies power directly to the windshield wiper motor from fuse 25 (20A) when the ignition switch is in the ON or ACC position for RUN/PARK operation. When the multifunction switch is in the LOW, HIGH, or INTERMITTENT position, power is supplied to the windshield wiper motor, which moves the wipers off the park position. Once the wipers are off the park position, an internal switch in the windshield wiper motor switches to the run/park position which directs power to the wiper switch then back to the wiper motor. This maintains power to the windshield wiper motor to complete the wipe cycle. When the cycle is complete, the internal switch in the windshield wiper motor switches back to the park position. If the multifunction switch is in the LOW or HIGH position, power is supplied from the multifunction switch and another wipe cycle starts. If the multifunction switch is in the INTERMITTENT position, the windshield wipers remain parked until the internal relay in the multifunction switch supplies power to the windshield wiper motor. The internal relay supplies power after a time delay that is determined by the 1 of 9 intermittent switch settings.
Wiper motors suffer this problem when the bushes on the shaft at the bottom of the wiper arms are dry an tighten on the shafts. If you remove the wiper arms and the dust cap under them you may be able to free up the shafts by spraying WD 40/ CRC on the shaft and let it run down into the bush as the wipers are working Other than that it is wipers out for the job.
Fuses, disconnected power, or a bad wiper motor - check the connections on the wiper motor - make sure wires are not worn and frayed so there is a good solid connection - check you fuse block the fuses should be identified in the manual or on the fuse panel door. If neither of those are the issue go to AutoZone and ask for current check on the wiper motor
The base nut needs to be tightned, with the key on and wipers off, now turn key off and position wiper in the park position (down) then tight the nut,remove the cover at the bottom of the arm to see nut,
NOTE
A new wiper motor assembly comes with the linkage arm installed.
Before servicing the vehicle, refer to the Precautions Section.
Remove the windshield wiper mounting arm and pivot shaft
WARNING
Do not remove the wiper motor linkage arm from the wiper motor
assembly. If the arm is removed, the wiper arms may not park in the
correct location.
NOTE
Use a suitable tool to separate the wiper linkage arm from the wiper mounting arm and pivot shaft assembly.
Remove the 3 bolts and the wiper motor.
Fig. Wiper motor and linkage
To install:
Install wiper motor and bolts.
Tighten wiper motor bolts to 10 ft. lbs. (13 Nm).
Install windshield wiper mounting arm and pivot shaft.
Check wiper operation.
Rear Wiper Motor - Removal & Installation
Remove the rear pivot arm.
Remove the rear wiper motor shaft nut cover
Remove the rear wiper motor shaft nut.
Open the lift gate window.
Remove the rear wiper motor cover trim panel.
Disconnect the electrical connector.
Remove the 2 rear window wiper motor nuts
Remove the rear window wiper motor.
Fig. Rear wiper motor view-2008 model shown, other years similar
To install:
Install rear wiper motor and tighten mounting nuts to 62 inch lbs. (7 Nm).
Reconnect the electrical connector.
Install wiper motor cover trim panel.
Install rear wiper pivot arm tighten nut to 53 inch lbs. (6 Nm).
2002 Ford F-250 Windshield Wiper Motor
Removal & Installation
1. Turn the ignition switch to the ON position. Turn the ignition switch ON until the wiper blades are straight up, then turn the ignition switch OFF.
2. Disconnect the negative battery cable.
3. Remove the right-hand and left-hand windshield wiper arm and blade assemblies.
4. Remove the cowl top vent panels.
5. Detach the electrical hardness connector at the windshield wiper motor assembly.
6. Remove 3 wiper motor (module assembly) retaining bolts and remove the module assembly from the vehicle.
7. Remove the wiper linkage retaining bolt and remove the linkage from the wiper motor.
8. Remove 3 retaining nuts and remove the windshield wiper motor
To install;
9. Place the windshield wiper motor in position and install 3 retaining nuts. Tighten to 10-12 ft. lbs. (12-17 Nm).
10. Connect the wiper linkage to the windshield wiper motor and install the retaining bolt. Tighten the bolts to 14 ft. lbs. (20 Nm).
11. Place the wiper motor (module assembly) in position and install 3 retaining bolts. Tighten the bolts to 6 ft. lbs. (9Nm).
12. Install the electrical hardness connector to the windshield wiper motor.
13. Connect the negative battery cable.
14. Allow the windshield wiper motor to cycle several times while checking for proper wiper motor operation.
15. Turn the windshield wiper motor to the OFF position to park the wiper motor in the park position.
16. Install the cowl top vent panels.
17. Install the wiper arm and blade assemblies. Install the retaining nuts and tighten to 22-29 ft. lbs. (30-40 Nm).
18. Connect the negative battery cable.
19. Check the windshield wiper motor for proper operation and the wiper arms for adjustment.
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