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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Door & Lock (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B242A: Closure Condition >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  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 MONITOR ITEM 
    1. Select AUTOMATIC BACK DOOR CONTROL MODULE using CONSULT.
    2. Select HALF LATCH SW, OPEN SW and CLOSE SW in DATA MONITOR mode.
    3. Check that the function operates normally according to the following conditions.

    Monitor item

    Condition

    Status

    HALF LATCH SW

    Back door

    Fully closed/Open

    OFF

    Half latch

    ON

    OPEN SW

    Fully closed/Half latch

    OFF

    Open

    ON

    CLOSE SW

    Open/Half latch

    OFF

    Fully closed

    ON

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 4.

  4. CHECK 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

      (Approx.)

      Back door lock assembly

      Connector

      Terminal

      D557

      4

      Ground

      Battery voltage

      5

      6

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    GO TO 5.

  5. CHECK SWITCH CIRCUIT 
    1. Disconnect automatic back door control module connector.
    2. Check continuity between automatic back door control module harness connector and back door lock assembly harness connector.

      Automatic back door control module

      Back door lock assembly

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B55

      3

      D557

      6

      Yes

      5

      5

      11

      4

    3. Check continuity between automatic back door control module harness connector and ground.

      Automatic back door control module

      Ground

      Continuity

      Connector

      Terminal

      B55

      3

      No

      5

      11

    Is the inspection result normal?

    YES

    Replace automatic back door control module. Refer to Removal and Installation .

    NO

    Repair or replace harness.

  6. CHECK SWITCH GROUND CIRCUIT 

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

    Back door lock assembly

    Ground

    Continuity

    Connector

    Terminal

    D557

    8

    Yes

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair or replace back door lock assembly ground circuit.

  7. CHECK SWITCH 

    Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

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

  8. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Inspection End.