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
SOURCE: 2004 Yukon windshied wipers wont turn off
change our wiper motor the circuit inside of the motor dont trasfer the power to therminate the cycle hope it FIXYA our problem thanks pierre
SOURCE: 99 Yukon windshield wipers
We had the same problem and sometimes they wouldn't turn off. The intermittent wipers were random. We replaced the wiper motor. Be sure to get the motor with two balls on the wiper shaft (one for each wiper arm). If you can't find it, you'll have to change the part out on the new motor. Keep the wiper arms in the same location on removal, or it will jam and you'll have to start over.
SOURCE: My 2004 yukon back wiper
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.
SOURCE: 2005 gmc yukon rear window motor buzz, new one does same thing
sounds like you may have a bad ground on the motor .even a brand new motor wont work if it has a poor ground check your connections
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