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Home >> Infiniti >> 2022 >> QX55 Essential >> Repair and Diagnosis >> Body & Frame >> Exterior Body Panels >> Door & Lock (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Back Door Switch >> Diagnosis Procedure (With Automatic Back Door)

Diagnosis Procedure (With Automatic Back Door)

  1. CHECK BACK DOOR SWITCH INPUT SIGNAL 
    1. Ignition switch OFF.
    2. Disconnect back door lock assembly connector.
    3. Check signal between back door lock assembly harness connector and ground using oscilloscope.

      (+)

      (-)

      Signal

      (Reference value)

      Back door lock assembly

      Connector

      Terminal

      D560

      7

      Ground

      GNSJPMIA0593GB-593Courtesy of NISSAN NORTH AMERICA, INC.

      9.0 - 10.0 V

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. CHECK BACK DOOR SWITCH CIRCUIT 
    1. Disconnect BCM connector.
    2. Check continuity between back door lock assembly harness connector and BCM harness connector.

      Back door lock assembly

      BCM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      D560

      7

      M304

      51

      Yes

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

      Back door lock assembly

      Ground

      Continuity

      Connector

      Terminal

      D560

      7

      No

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    Repair or replace harness.

  3. CHECK BACK DOOR SWITCH GROUND CIRCUIT 

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

    Back door lock assembly

    Ground

    Continuity

    Connector

    Terminal

    D560

    8

    Yes

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace harness.

  4. CHECK BACK DOOR SWITCH 

    Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Replace back door lock assembly. Refer to Removal and Installation .

  5. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Inspection End.