2003 Nissan-Datsun Sentra SE-R, StandardFACTORY OEM SERVICE PROCEDURE

Display Communication Line Check (Between Display Control Unit and Display)

WARNING: This page is about a different car, the 2003 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display connector and display control unit connector.
    3. Check continuity between display control unit and Display.
      DISPLAY COMMUNICATION LINE HARNESS CHECK CHART (1 OF 2)

      Terminals Continuity
      Display control unit (+) Display (-)
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      M43 36 (O/L) M38 11 (O/L) Yes
      38 (W/L) 22 (W/L)
    4. Check continuity between display control unit and ground.
    DISPLAY COMMUNICATION LINE HARNESS CHECK CHART (2 OF 2)

    Terminals Continuity
    Display control unit (+) (-)
    Connector Terminal (Wire color)
    M43 36 (O/L) Ground No
    38 (W/L)
    Fig 1: Checking Continuity Between Display Control Unit And Display And Between Display Control Unit And Ground
    G03360112Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : GO TO 2.
    2. NG : Repair harness or connector.
  2. CHECK1: COMMUNICATION SIGNAL (DCU-DSP) 
    1. Connect display control unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M43 terminal 36 (O/L) and ground.
      1. Approx. 3.5 V or more 

    OK or NG

    1. OK : GO TO 3.
    2. NG : Replace display control unit.
    Fig 2: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 36 And Ground
    G03360113Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK2: COMMUNICATION SIGNAL (DSP-DCU) 
    1. Connect display connector.
    2. Turn ignition switch ON.
    3. Check voltage between display control unit harness connector M43 terminal 38 (W/L) and ground.
      1. Approx. 3.5 V or more 

    OK or NG

    1. OK : GO TO 4.
    2. NG : Replace display unit.
    Fig 3: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 38 And Ground
    G03360114Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK3: COMMUNICATION SIGNAL (DCU-DSP) 
    1. Turn ignition switch ON.
    2. Check signal between display control unit harness connector M43 terminal 36 (O/L) and ground with CONSULT-II or oscilloscope.
      1. 36 (O/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   ".  
      Fig 4: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 36 And Ground
      G03360115Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : GO TO 5.
    2. NG : Replace display.
  5. CHECK4: COMMUNICATION SIGNAL (DSP-DCU) 
    1. Turn ignition switch ON.
    2. Check signal between display control unit harness connector M43 terminal 38 (W/L) and ground with CONSULT-II or oscilloscope.
      1. 38 (W/L) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT   ."  

    OK or NG

    1. OK : Replace display.
    2. NG : Replace display control unit.
    Fig 5: Checking Voltage Between Display Control Unit Harness Connector M43 Terminal 38 And Ground
    G03360116Courtesy of NISSAN MOTOR CO., U.S.A.
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  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.