WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Sectional View Of 4WAS System (Front Actuator)
Courtesy of NISSAN NORTH AMERICA, INC.
Fig 2: Sectional View Of 4WAS System (Rear Actuator)