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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (SRS Airbag Control System (DTC/Circuit Diagnosis)) >> DTC / Circuit Diagnosis >> DTC B1401: Air Bag Diagnosis Sensor Unit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
  • Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait at least 3 minutes or more (to discharge backup capacitor).
  • Never use an unspecified tester or other measuring device.
  1. CHECK HARNESS CONNECTOR 

    Check the harness connector for disconnection, looseness or damage.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Damage: Replace malfunctioning harness and connector.

    NO

    Disconnection or looseness: Securely lock the connector.

  2. CHECK WIRING HARNESS 

    Check the wiring harness externals.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Replace malfunctioning harness and connector.

  3. REPLACE AIR BAG DIAGNOSIS SENSOR UNIT 
    1. Replace air bag diagnosis sensor unit. Refer to Removal and Installation .
    2. Perform DTC confirmation procedure. Refer to DTC Description .

    Is DTC detected?

    YES

    GO TO 1.

    NO

    Inspection End.