Diagnosis Procedure

WARNING: This page is about a different car, the 2004 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch ON. Make sure whether NAVI control unit produces beep sound (twice) ten seconds after navigation system starts.
Push and hold "MAP" and "D/N" switches simultaneously for 5 seconds or more. Make sure whether NAVI control unit produces beep sound twice.
Combining the result of step 1 and 2, select an appropriate diagnosis number from the Diagnosis result quick reference table.
Confirm and check the estimated malfunctioning system from the diagnosis number table.
Diagnosis result quick reference table.

Fig 1: Diagnosis Result Quick Reference Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Diagnosis number table

Fig 2: Diagnosis Number Table
Courtesy of NISSAN MOTOR CO., U.S.A.