WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Multi AV System (Without Navigation) - System Diagram
Courtesy of NISSAN MOTOR CO., U.S.A.
NOTE:
The name MULTIFUNCTION SWITCH indicates the integration of PRESET SWITCH and MULTIFUNCTION SWITCH virtually.