Operation Procedure

Start the engine.
Turn the audio system OFF.
While pressing the "4" button, turn the volume control dial clockwise or counterclockwise for 30 clicks or more. (When the self-diagnosis mode is started, a short beep will be heard.)
- Shifting from current screen to previous screen is performed by pressing "BACK" button.
  
  Fig 1: Identifying Back Button
  Courtesy of NISSAN MOTOR CO., U.S.A.
The initial trouble diagnosis screen will be shown, and items "Self Diagnosis (DCU)""Self Diagnosis (NAVI)""Confirmation/Adjustment" and "CAN DIAG SUPPORT MONITOR" will become selective.
Select "Confirmation/Adjustment".

Fig 2: Initial Trouble Diagnosis Screen Display - Self Diagnosis (DCU)
Courtesy of NISSAN MOTOR CO., U.S.A.
Each diagnosis is shown by selecting each screen switch on Confirmation/Adjustment screen.

Fig 3: Initial Trouble Diagnosis Screen Display - Confirmation/Adjustment Screen
Courtesy of NISSAN MOTOR CO., U.S.A.