First, remove the wiper arm and the shaft nut. Open the hatch and remove the interior panel. remove the three screws that secure the mounting plate for the motor and remove the whole assembly. Go to Nissan dealer for a replacement, it's cheaper and Nissan made it anyhow.
Rear Wiper Motor R&R Remove the rear pivot arm. Lift the pivot arm to the upright position. Slide the locking tab out. Pull up and remove the pivot arm. Remove the rear wiper motor shaft nut cover. Remove the rear wiper motor shaft nut. Remove the rear wiper motor cover. Remove the rear wiper motor bracket nut. Remove the bolt and the rear wiper motor. Reverse these steps to install.
(1) Pull the rear wiper arm cover back to access the wiper arm retaining nut and detach the nut and pull the wiper arm straight off the shaft. (2) Open the rear hatch glass and remove the rear wiper motor cover. (3) Disconnect the electrical connector from the motor. (4) Remove the motor mounting screw and remove the motor. Installation is the reverse of removal.
Are you sure it's the wiper motor ? I had problems with the rear wiper motor not working on two of my previous vehicles. Cheerokee and Tribute. They both had seized shaft. The shaft going from the motor to the wiper arm goes right through a bushing and that's where the problem occures. Over time the shaft rust and seize up. All you have to do is to clean the shaft and lubricate it. I hope you have the same problem I had, its a lot cheaper to clean it all up then to buy a new motor.