Rear wiper comes on all the time - 2006 GMC Yukon SLE

Did you check fuse's & relays ?
Rear Window Wiper Operation
The rear wiper motor is controlled by the SJB. The SJB supplies power to the rear wiper motor from the integrated rear wiper relay. The SJB will activate the relay when all of the following conditions are met:

• Ignition switch is in the ON position
• Liftgate glass and liftgate are closed
• Multi-function switch is in the ON or intermittent position

The SJB also supplies voltage to the rear wiper motor from SJB fuse 21 (15A) when the ignition switch is in the ON position. This power feed is used to continue the wipe cycle when the multi-function switch is turned to the OFF position. The SJB receives inputs from the multi-function switch that applies ground to the low speed wipe input or applies ground to the intermittent wipe input. When either of these circuits are grounded, the SJB activates the integrated rear wiper relay and power is supplied to the rear wiper motor to move the rear wiper motor from the park position. An internal switch in the rear wiper motor then moves to the run position which connects the accessory relay power to the rear wiper motor. When the rear wiper motor returns to the park position, the internal switch in the rear wiper motor moves back to the park position. If the multi-function switch is in the ON position, the rear wiper relay is still activated, power is supplied to the rear wiper motor, and the wipe cycle starts again. If the multi-function switch is in the intermittent position, the rear wiper relay does not activate until the predetermined dwell time has elapsed, at which time the SJB activates the rear wiper relay and the wipe cycle starts again. The SJB is the smart junction box .(computer )

Rear Washer System
The SJB supplies power to the rear washer pump from fuse 21 (15A) when the ignition switch is in the ON or ACC position. The rear washer pump receives ground from the multi-function switch when the wash function is turned ON. The multi-function switch also signals the SJB when the rear wash is activated and the SJB then activates the rear wiper.

What make , model an year vehicle ?

take your finger or small screw driver pry small flat shiny piece that has a small bend on it prey that back a little. What that piece does is it sits against the shaft keeps the wiper from coming off your just prying it out enough so you can pull the wiper off. Some times these wipers have been on a long time you have to tap the lightly to free them up not to hard easy. also look at your new wiper that you bought you will understand it better. Hope this helps

sorry so be the barer of bad news wiring loom fault

Every time a wiper motor faces resistance due to any thing it will surely blow the fuse or you migh need to tighten the bolt holding the wiper arm down cause it might have spun and come loose.

PUT A NEW GROUND WIRE IN THE REAR WIPER MOTOR

The rear wiper motors go bad on this particular vehicle all the time

put oil on the pin that fastens the arm to the rotator. work the arm up and down several times to work out the grindge and rust. Reoil and repeat several times
wiper will rest on the window for full operation

my 2004 expedition had same problem, if you take apart the shaft that goes thru the glass it will be full of dirt, clean ,lubricate and reinstall, you may have to replace the O-ring on the shaft. a 20 minute job, very easy fix

i can not remoce the rear wiper blade to replace it can u help