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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 1420 (Audio Visual, Navigation & Telephone System) >> Navigation System >> Self-Diagnosis Mode (DCU) >> Operation Procedure
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Operation Procedure

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine.
  2. Turn the audio system off.
  3. While pressing the "MUTE/II  " 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 "PREV" button.
    Fig 1: Turning Audio System Off
    G02365608Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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.
    Fig 2: Identifying Display - Self Diagnosis
    G02365609Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Perform self-diagnosis by selecting the "Self-diagnosis (DCU)".
    • Self-diagnosis subdivision screen will be shown and the operation enters the self-diagnosis mode.
    • A bar graph shown below the self-diagnosis subdivision screen indicates progress of the diagnosis.
    Fig 3: Identifying Display - Self Diagnosis (DCU)
    G02365610Courtesy of NISSAN MOTOR CO., U.S.A.
  6. When the self-diagnosis completes, optional part confirmation screen will be shown.
    • When connection of an optional part is judged error, a screen to check if the optional part is actually fitted on the vehicle or not will be shown. When fitted, select the switch of the part on the screen and press "End". Then the "SELF DIAGNOSIS" screen will be shown.
    • When the optional part is connected normally, the switch for the part will not appear on the screen.
    Fig 4: Identifying Display - Self Diagnosis (DCU)
    G02365611Courtesy of NISSAN MOTOR CO., U.S.A.
  7. On the "SELF DIAGNOSIS" screen, each unit name will be colored according to the diagnosis result, as follows.
    1. Green : No malfunctioning. 
    2. Yellow : Cannot be judged by self-diagnosis results. 
    3. Red : Unit is malfunctioning. 
    4. Gray : Diagnosis has not been done. 
    • If several malfunctions are present in a unit, color of its switch on the screen will be either red, yellow, or gray, determined by the malfunction of the highest priority.
    Fig 5: Identifying Display - Self Diagnosis (DCU)
    G02365612Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Select a switch on the "SELF DIAGNOSIS" screen and comments for the diagnosis results will be shown.
    • When the switch is green, the following comment will be shown. "Self-diagnosis was successful. Further diagnosis and adjustments are recommended. Follow the "confirmation/adjustments" menu or refer to the service manual.".
    • When the switch is yellow, the following comment will be shown. "Connection to the following unit is abnormal. See the service manual for further details".
    • When the switch is red, the following comment will be shown. "DCU is abnormal".
    Fig 6: Identifying Display
    G02365613Courtesy of NISSAN MOTOR CO., U.S.A.
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