2004 Ford Expedition Rear wiper

Tiny
SBUTZ
  • MEMBER
  • 2004 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 111,000 MILES
The rear wiper will only work with the washer. It doesn't run on intermittent. Is this a bad motor?
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Monday, March 30th, 2015 AT 6:45 PM

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Tiny
CARADIODOC
  • EXPERT
Nope. Well, ... Yup. You can see the motor working when you press the washer button, so you know the motor is okay. The cause of the problem could be the wiper switch, and in the past, that, or a broken wire, would have been the only possible causes, but for the last ten to fifteen years the engineers at Ford have gone insane with their unnecessary use of technology. There's going to be a computer involved with the wipers on your vehicle.

There's actually two switches built into one "Rear Wiper" switch for the rear wiper, and one of them could be defective, but you would have to do some electrical tests to determine if that is the cause of the problem. The more likely suspect is the computer, and in this case it is built into the rear wiper motor assembly. That insures that regardless of which part is defective, you will have to buy the motor, relays, and computer, all as one part.

A professional would perform two electrical tests at the rear wiper motor to determine if the motor, (computer), is defective or the switch or a wire is causing the problem. If you want to do those tests, you'll need a voltmeter or a test light, and I'll dig up a wiring diagram to determine which wires to test.
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Monday, March 30th, 2015 AT 7:11 PM

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