WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Audio Base System Wiring Diagram (1 Of 4) - AV-AUDIO-01
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Audio Base System Wiring Diagram (2 Of 4) - AV-AUDIO-02
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Audio Base System Wiring Diagram (3 Of 4) - AV-AUDIO-03
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: Audio Base System Wiring Diagram (4 Of 4) - AV-AUDIO-04