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Power Supply and Ground Circuit Check for Display Unit

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY AND GROUND CIRCUIT FOR DISPLAY CONTROL UNIT 

    Check power supply and ground circuit for display control unit. Refer to "POWER SUPPLY AND GROUND CIRCUIT CHECK FOR DISPLAY CONTROL UNIT ".

    OK or NG 

    • OK: GO TO 2.
    • NG: Repair malfunctioning part.
  2. CHECK POWER SUPPLY CIRCUIT FOR DISPLAY UNIT 
    1. Disconnect display unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M93 terminals 2 (L/W), 3 (L/R) and ground.

      Approx. 9V 

      4. Fig 1: Checking Voltage Between Display Unit Harness Connector M93 Terminals 2, 3 And Ground
      G03604669Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 4.
    • NG: GO TO 3.
  3. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect display unit connector M93 and display control unit connector M94.
    3. Check continuity between display control unit harness connector M94 terminals 2 (L/W), 4 (L/R) and display unit harness connector M93 terminals 2 (L/W), 3 (L/R).
      Fig 2: Checking Continuity Between Display Control Unit Harness Connector M94 Terminals 2, 4 And Display Unit Harness Connector M93 Terminals 2, 3
      G03604670Courtesy of NISSAN MOTOR CO., U.S.A.
      CONTINUITY BETWEEN DISPLAY CONTROL UNIT HARNESS CONNECTOR M94 TERMINALS 2, 4 AND DISPLAY UNIT HARNESS CONNECTOR M93 TERMINALS 2, 3

      Terminals Continuity
      Display control unit Display unit
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      M94 2 (L/W) M93 2 (L/W) Yes
      4 (L/R) 3 (L/R)
    4. Check continuity between display unit and ground.
      CONTINUITY BETWEEN DISPLAY UNIT AND GROUND

      Terminals Continuity
      Display unit -
      Connector Terminal (Wire color)
      M93 2 (L/W) Ground No
      3 (L/R)

      OK or NG 

  4. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between display unit harness connector M93 terminals 13 (P), 14 (P/L) and ground.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Display Unit Connector M93 Terminals 13, 14 And Ground
      G03604671Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 6.
    • NG: GO TO 5.
  5. CHECK HARNESS 
    1. Disconnect display control unit connector M94.
    2. Check continuity between display unit harness connector M93 terminals 13 (P), 14 (P/L) and display control unit harness connector M94 terminals 5 (P), 7 (P/L).

      Continuity should exist  .

      3. Fig 4: Checking Continuity Between Display Unit Harness Connector M93 Terminals 13, 14 And Display Control Unit Harness Connector M94 Terminals 5, 7
      G03604672Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  6. CHECK GROUND CIRCUIT 

    Check continuity between display unit and ground as follows.

    Fig 5: Checking Continuity Between Display Unit And Ground
    G03604673Courtesy of NISSAN MOTOR CO., U.S.A.
    CONTINUITY BETWEEN DISPLAY UNIT AND GROUND

    Terminals Ignition switch Continuity
    Connector Terminal (Wire color) -
    M93 1 (B) Ground OFF Yes

    OK or NG 

    • OK: Inspection End.
    • NG: Repair harness.
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