Do you know how to use a volt meter ? Need to check for voltage at the motor ! , need a wiring diagram. Most of the time other people on here will tell you to check the fuse's , that doesn't end up being the cause ! Most of the time it's the motor or a wiring problem ! I have seen the wire in side the rubber boot ,when you open the rear hatch break causing a no power situation to the motor . If you open the rear hatch ,door ,lift gate , what ever you call it . If you look when it is open there is a rubber boot connecting the body to the door , there are wires in side . There have been known to break ! This next part is a FORD pinpoint test. This is how ford says how to check !
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - REAR WINDOW
Test Step
Result / Action to Take
B1 CHECK CIRCUITS CBP43 (GY) AND SBP19 (BU/RD) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Rear Wiper Motor C476.
- Key in ON position.
- Measure the voltage between rear wiper motor C476-3, circuit CBP43 (GY), harness side and ground; and between rear wiper motor C476-4, circuit SBP19 (BU/RD), harness side and ground.
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- Are the voltages greater than 10 volts?
Yes
GO to B2 .
No
VERIFY SJB fuse 43 (5A) and fuse 19 (25A) are OK. If OK, REPAIR the circuit(s) in question. TEST the system for normal operation.
B2 CHECK CIRCUIT GD150 (BK/WH) FOR OPEN
- Key in OFF position.
- Measure the resistance between rear wiper C476-1, circuit GD150 (BK/WH), harness side and ground.
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- Is the resistance less than 5 ohms?
Yes
GO to B3 .
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
B3 CHECK THE MULTI-FUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multi-function Switch C202.
- Carry out the multi-function switch component test.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.
- Did the multi-function switch pass the component test?
Yes
GO to B4 .
No
INSTALL a new multi-function switch. REFER to Section 211-05 .
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