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Home >> Infiniti >> 2011 >> FX35 RWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Door & Lock - With Automatic Back Door -- FX35/FX50 >> DTC/Circuit Diagnosis >> DTC B2420: Close Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FOR FOREIGN MATERIALS IN BACK DOOR LOCK ASSEMBLY

    Check for entry of foreign materials in back door lock assembly.

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Remove foreign materials.

  2. CHECK BACK DOOR OPEN/CLOSE OPERATION

    Manually check open and close operation of back door.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace the malfunctioning parts.

  3. CHECK CLOSE SWITCH SIGNAL
    1. Select "AUTOMATIC BACK DOOR CONTROL UNIT" using CONSULT-III.
    2. Select "CLOSE SW" in "DATA MONITOR" mode.
    3. Check that the function operates normally according to the following conditions.
      MONITOR ITEMS CONDITION CHART

      Monitor item Condition Status
      CLOSE SW Back door Open/Half latch OFF
      Fully closed ON

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 4.

  4. CHECK CLOSE SWITCH INPUT SIGNAL
    1. Turn ignition switch OFF.
    2. Disconnect back door lock assembly connector.
    3. Check voltage between back door lock assembly harness connector and ground.
      VOLTAGE REFERENCE CHART

      (+) (-) Voltage (Approx.)
      Back door lock assembly
      Connector Terminal
      D107 5 Ground 16 - 8 V

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. CHECK CLOSE SWITCH CIRCUIT
    1. Disconnect automatic back door control unit connector.
    2. Check continuity between automatic back door control unit harness connector and back door lock assembly harness connector.
      CONTINUITY REFERENCE CHART

      Automatic back door control unit Back door lock assembly Continuity
      Connector Terminal Connector Terminal
      B207 5 D107 5 Existed
    3. Check continuity between automatic back door control unit harness connector and ground.
      CONTINUITY REFERENCE CHART

      Automatic back door control unit Ground Continuity
      Connector Terminal
      B207 5 Not existed

      Is the inspection result normal? 

      YES: Replace automatic back door control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace harness.

  6. CHECK CLOSE SWITCH GROUND CIRCUIT

    Check continuity between back door lock assembly harness connector and ground.

    CONTINUITY REFERENCE CHART

    Back door lock assembly Ground Continuity
    Connector Terminal
    D107 8 Existed

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair or replace harness.

  7. CHECK CLOSE SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace back door lock assembly.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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