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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 2245 (Audio, Visual, Navigation System (BOSE Audio Without Navigation)) >> DTC/Circuit Diagnosis >> DTC U1243: Display Unit >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITHOUT NAVIGATION SYSTEM ".

  1. CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

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

    Is inspection result OK? 

    YES: GO TO 2

    NO: Repair malfunctioning parts.

  2. CHECK CONTINUITY OF 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 M93 (A) terminals 11, 22 and AV control unit harness connector M45 (B) terminals 56, 44.
      A B Continuity
      Connector Terminal Connector Terminal
      M93 11 M45 56 Yes
      22 44
    4. Check continuity between display unit harness connector M93 (A) terminals 11, 22 and ground.
      A - Continuity
      Connector Terminal
      M93 11 Ground No
      22
    Fig 1: Checking Continuity Between Display Unit Connector M93 (A) Terminals And AV Control Unit Connector M45 (B) Terminals
    G08169571Courtesy of NISSAN NORTH AMERICA, INC.

    Are continuity results as specified? 

    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 M93 terminal 11 and ground with an oscilloscope or CONSULT.
      (+) (-) Reference signal
      Connector Terminal
      M93 11 Ground
      G08169572
    Fig 2: Checking Signal Between Display Unit Connector M93 Terminal 11 And Ground Using Oscilloscope
    G08169573Courtesy of NISSAN NORTH AMERICA, INC.

    Are voltage readings as specified? 

    YES: GO TO 4

    NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK COMMUNICATION SIGNAL

    Check signal between display unit harness connector M93 terminal 22 and ground with an oscilloscope or CONSULT.

    (+) (-) Reference signal
    Connector Terminal
    M93 22 Ground
    G08169574
    Fig 3: Checking Signal Between Display Unit Connector M93 Terminal 22 And Ground Using Oscilloscope
    G08169575Courtesy of NISSAN NORTH AMERICA, INC.

    Are voltage readings as specified? 

    YES: Inspection End.

    NO: Replace display unit. Refer to "REMOVAL AND INSTALLATION ".

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