there is a little removable plastic panel at the inside bottom of the rear hatch. pop the cover, and there is a manual latch release inside. on the drivers side is the electric motor, and actuating rod. it is very normal for nissan not to have torqued, or lock tighted the bolts that hold the actuator motor on to the vehicle. if the motor comes loose, everything binds, and no function. if you can figure how to get to the actuator motor through the compartment that holds your jack, you can set things straight. just make sure the battery is disconnected before sticking hands into where the motor/gears/mount is. Just something to consider.