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Home >> Infiniti >> 2011 >> G37 Base, 2D Coupe >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 53 (Audio System, Visual System & Navigation System (Base Audio Without Navigation) - G37 Convertible) >> DTC/Circuit Diagnosis >> DTC U1243: Display Unit >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

    Check display unit power supply and ground circuit. Refer to "DISPLAY UNIT : DIAGNOSIS PROCEDURE ".

    Is the inspection result normal? 

    YES: Go to 2.

    NO: Repair malfunctioning parts.

  2. CHECK CONTINUITY COMMUNICATION CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect display unit connector and AV control unit connector.
    3. Check continuity between display unit harness connector and AV control unit harness connector.
      CONTINUITY REFERENCE CHART

      Display unit AV control unit Continuity
      Connector Terminals Connector Terminals
      M71 11 M202 51 Existed
      22 39
    4. Check continuity between display unit harness connector and ground.
      CONTINUITY REFERENCE CHART

      Display unit Ground Continuity
      Connector Terminals
      M71 11 Not existed
      22

      Is the inspection result normal? 

      YES: Go to 3.

      NO: Repair harness or connector.

  3. CHECK COMMUNICATION SIGNAL
    1. Connect display unit connector and AV control unit connector.
    2. Turn ignition switch ON.
    3. Check signal between display unit harness connector and ground.
      SIGNAL REFERENCE CHART

      (+) (-) Condition Reference value
      Display unit
      Connector Terminal
      M71 22 Ground When adjusting display brightness.
      G07161299Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: Go to 4.

      NO: Replace AV control unit. Refer to "EXPLODED VIEW ".

  4. CHECK COMMUNICATION SIGNAL

    Check signal between display unit harness connector and ground.

    SIGNAL REFERENCE CHART

    (+) (-) Condition Reference value
    Display unit
    Connector Terminal
    M71 11 Ground When adjusting display brightness.
    G07161300Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace display unit. Refer to "EXPLODED VIEW ".

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