WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Reclining motor is installed to seat frame assembly.
Courtesy of NISSAN NORTH AMERICA, INC.
Seatback is reclined forward/backward by changing the rotation direction of reclining motor.