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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 922 (Audio, Visual, Navigation System (Base Audio)) >> DTC/Circuit Diagnosis >> DTC U1243: Display Unit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  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 M44 (B) terminals 56, 44.
      A B Continuity
      Connector Terminal Connector Terminal
      M93 11 M44 56 Yes
      22 44
    4. Check continuity between display unit harness connector M93 (A) terminals 11, 22 and ground.
      Fig 1: Checking Continuity Of Communication Circuit
      G08693537Courtesy of NISSAN NORTH AMERICA, INC.
      A - Continuity
      Connector Terminal
      M93 11 Ground No
      22

      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
      G08693538
      Fig 2: Checking Communication Signal Using Oscilloscope
      G08693539Courtesy 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
    G08693540
    Fig 3: Checking Communication Signal Using Oscilloscope
    G08693541Courtesy 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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