A motor vehicle window assembly, one implementation of which includes a wiper in electrical communication between a defrost grid of a movable window and an elongate conductor of a guide rail assembly having a straight guide portion and an oblique guide portion, and in contact with the elongate conductor when the movable window is in an open position. At least one implementation of the window assembly includes an actuator cable including a core having a terminus coupled to a cable connector portion of the movable window, wherein when the actuator cable is actuated, the movable window moves in a direction extending away from the open position along a plane, toward a closed position out of the plane, and into the closed position in another plane such that the terminus of the core is carried out of the plane by the movable window.