Starting The Self-Diagnosis Mode

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch from OFF to ACC.
Within 10 seconds push and hold the witches "PAUSE/MUTE" and "PREV" simultaneously for 3 seconds.

Then the self-diagnosis operates.

Fig 1: Identifying PAUSE/MUTE" and "PREV" Switches

Courtesy of NISSAN MOTOR CO., U.S.A.