WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram - Audio Communication (1 Of 3) - AV-COMM-01
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Wiring Diagram - Audio Communication (2 Of 3) - AV-COMM-02
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Wiring Diagram - Audio Communication (3 Of 3) - AV-COMM-03