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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 B2427: Encoder >> Diagnosis Procedure

Diagnosis Procedure

  1. CALIBRATION OF AUTOMATIC BACK DOOR POSITION INFORMATION
    1. Perform initialization setting of automatic back door position information. Refer to "WORK PROCEDURE ".
    2. Erase DTC, and then repeat "PERFORM DTC CONFIRMATION PROCEDURE".

      Is DTC detected? 

      YES: GO TO 2.

      NO: INSPECTION END

  2. CHECK INSTALLATION OF BACK DOOR ASSEMBLY
    1. Check that back door assembly is installed normally. Refer to "BACK DOOR ASSEMBLY : ADJUSTMENT ".
    2. Check back door assembly mechanism deformation, looseness, rattle, interference with other parts, and pinched foreign materials.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace the malfunctioning parts.

  3. CHECK ENCODER SIGNAL
    1. Select "AUTOMATIC BACK DOOR CONTROL UNIT" using CONSULT-III.
    2. Select "SPINDLE RH ENCODER A" and "SPINDLE RH ENCODER B" in "DATA MONITOR" mode.
    3. Check that the function operates normally according to the following conditions.
      MONITOR ITEMS CONDITION CHART

      Monitor item Condition Status
      SPINDLE RH ENCODER A Back door Moving (auto or manual) HI <=> LO
      When stopped HI or LO
      SPINDLE RH ENCODER B Moving (auto or manual) HI <=> LO
      When stopped HI or LO

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace automatic back door control unit. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK ENCODER POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect spindle unit RH connector.
    3. Check voltage between spindle unit RH harness connector and ground.
      VOLTAGE REFERENCE CHART

      (+) (-) Voltage (Approx.)
      Spindle unit RH
      Connector Terminal
      B262 3 Ground 16.75 - 6 V

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. CHECK ENCODER CIRCUIT
    1. Disconnect automatic back door control unit connector.
    2. Check continuity between automatic back door control unit harness connector and spindle unit RH harness connector.
      CONTINUITY REFERENCE CHART

      Automatic back door control unit Spindle unit RH Continuity
      Connector Terminal Connector Terminal
      B207 20 B262 3 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 20 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 ENCODER CIRCUIT 2
    1. Disconnect automatic back door control unit connector.
    2. Check continuity between automatic back door control unit harness connector and spindle unit RH harness connector.
      CONTINUITY REFERENCE CHART

      Automatic back door control unit Spindle unit RH Continuity
      Connector Terminal Connector Terminal
      B207 8 B262 4 Existed
      9 5
    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 8 Not existed
      9

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace harness.

  7. CHECK ENCODER CIRCUIT 3
    1. Connect automatic back door control unit spindle unit RH connector.
    2. Check continuity between automatic back door control unit harness connector and ground.
      CONTINUITY REFERENCE CHART

      Automatic back door control unit Ground Voltage (Approx.)
      Connector Terminal
      B207 21 0 V

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Replace automatic back door control unit. Refer to "REMOVAL AND INSTALLATION ".

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

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

    NO: Repair or replace the malfunctioning parts.