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

WARNING: This page is about a different car, the 2004 Nissan Armada. 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 unit connector and display control unit connector.
    3. Check continuity between display control unit and display unit.
      CONNECTOR TERMINALS CONTINUITY

      Terminals Continuity
      Display control unit (+) Display unit (-)
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      M95 36 (BAN) M93 11(BAN) Yes
      38(L) 22 (L)
    4. Check continuity between display control unit and ground.
      CONNECTOR TERMINALS CONTINUITY

      Terminals Continuity
      Display control unit (+) (-)
      Connector Terminal (Wire color)
      M95 36(B/W) Ground No
      38 (L)

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair harness or connector.
    Fig 1: Checking Continuity Between Display Control Unit And Ground
    G03497609Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK 1: COMMUNICATION SIGNAL (DCU-DSP) 
    1. Connect display unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M93 terminal 11 (B/W) and ground.
      1. Approx. 3.5 V or more  .

    OK or NG

    1. OK: GO TO 3.
    2. NG: Replace display unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY UNIT .
    Fig 2: Checking Voltage Between Display Unit Harness Connector M93 Terminal 11 And Ground
    G03497610Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK 2: COMMUNICATION SIGNAL (DSP-DCU) 
    1. Turn ignition switch OFF.
    2. Disconnect display control unit connector.
    3. Connect display control unit connector.
    4. Turn ignition switch ON.
    5. Check voltage between display control unit harness connector M95 terminal 38 (L) and ground.
      1. Approx. 3.5 V or more  .

    OK or NG

    1. OK: GO TO 4.
    2. NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
    Fig 3: Checking Voltage Between Display Control Unit Harness Connector M95 Terminal 38 (L) And Ground
    G03497611Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK 3: COMMUNICATION SIGNAL (DCU-DSP) 
    1. Turn ignition switch OFF.
    2. Connect display unit connector.
    3. Turn ignition switch ON.
    4. Check signal between display control unit harness connector M95 terminal 36 (B/W) and ground with CONSULT-II or oscilloscope.
      1. 36 (B/W) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT .

    OK or NG

    1. OK: GO TO 5.
    2. NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
    Fig 4: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 36 And Ground
    G03497612Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK 4: COMMUNICATION SIGNAL (DSP-DCU) 
    1. Turn ignition switch ON.
    2. Check signal between display control unit harness connector M95 terminal 38 (L) and ground with CONSULT-II or oscilloscope.
      1. 38 (L) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT .

    OK or NG

    1. OK:INSPECTION END.
    2. NG: Replace display unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY UNIT .
    Fig 5: Checking Signal Between Display Control Unit Harness Connector M95 Terminal 38 (L) And Ground
    G03497613Courtesy of NISSAN MOTOR CO., U.S.A.
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