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I'd suggest that you check the fuse first. The fuse box is located on the outside cabin wall at the driver's left knee.
The hatch wiper motor is well made and I've never had trouble with mine. The most common cause for failure of any of the rear hatch accessories is broken wiring where it passes from the cabin to the door through the hinges.
Wires pass through both hinges. I believe the wires for the wiper are on the passenger side. This repair involves supporting the door, removing one small corner of the headliner and the hinge, and repairing the wiring.
You can go for a new harness, if you like. The way I prefer to repair these wires when they fail is by splicing-in some extra common wire at one end of the harness and then moving the harness so that some previously unused section of the harness wire is at the flex point. The harness wire is very finely stranded and has a rubbery insulation so that it can tolerate flexing better than the average bear.
One way to support the hatch during this repair is by suspending it from above. A rope through the handle will do the trick. Be careful to loosen only one hinge at a time so this repair doesn't get unnecessarily complicated.
The headliner is held in place by a strip of plastic at its edge which fits in a slot at the cabin roof perimeter. To pull some of the headliner down, carefully stretch the headliner fabric down and to the outside. You can do this without tools.
Once you have the headliner down you'll be able to see the roof bolts and the wiring. The bolts for the door side of the hinge will be easy to find. You'll need a big Phillips bit or screwdriver for two of these. I use a #3 or #4 Phillips.
Good luck with it!
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