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Re: My 2004 yukon back wiper doesn't work anymore. Its...
Check the wire/contact that transfers the power from the body to the rear door which houses the wiper mechanism. That would be the first course of action. A failed wiper motor is less likely but not impossible.
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You need to remove the trim panel inside the back door, Unplug the motor, Be sure you have power on the Orange wire with key on, then test the Grey wire with wiper on, key on and if power? then likely bad motor If NO power on one or both wires at the plug? then fuse for rear wiper or bad switch the orange wire is from the RR WPR fuse in the under hood fuse box.
I doubt the other fuse is bad as if it was, the rear washer would not work So,, be sure power on orange wire, then check power on grey wire with wiper on and key on. No power on grey? bad switch. No power on both orange and grey? likely motor. This is the only way to test the system
Then get out the Wiring Diagrams & get familiar with the
system & pick a test point, or start taking things apart, to get
to the motor or your test points,the most logical part to
have possibly failed
No one can do that for you or tell you what the problems are
CHECK WIPER FLUID LEVEL FIRST ALL IS GOOD CHECK FOR POWER AT WIPER WASHER PUMP MOTOR.IF NO POWER AT WIPER WASHER MOTOR.CHECK 15 AMP FUSE IN THE ENGINE COMPARTMENT FUSE RELAY BOX.IF YES YOU ARE GETTING POWER AT WIPER WASHER MOTOR.WIPER WASHER MOTOR FAULTY.
There might be a fuse with more than just the wipers on it. Does anything else not work? A blown fuse is most likely the cause, it might be hard to locate check owners manuel for fuse locations as they can be in several locations.
Denny
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