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It's a loose / broken hose running from the washer fluid reservoir to the windshield wiper. Trace the hose and look for the leak. May need to pull up the back seat since that seems to be where the leak is.
Open the door, remove all screws to liner, then after all the screws are out, gently pry the liner off to gain access to the inside of the rear hatch. Check with a voltmeter the power going to the arm with the switch on. If no power, then check fuse or relay. If there is power, then likely the wiper motor is bad.
Shure there is a fuse , and check you will.
Fill some more fluid.
Check nipple with a pin for bolckage. And hose if disconected.
Is it leaking somewhere else ?
Now check Amplifier module to motor and pump of windshield wiper assembly.
Next check actuation swich at cockpit.
heck voltage at pump at reservoir.
Direct conect live voltage to pump.
Finally replace pump.
If you remove the rectangular plastic cover off your windshield wiper motor, you will find a circuit board. Take it out and throw it away, and get a new one. I had to do that to mine this past winter. My buddy, after taking his truck to GM and giving them 300 bucks, got me to change his, and the problem was gone. The board is 20 or 30 dollars.