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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 513 (SRS Airbag Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC B0022: Curtain Air Bag Module >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. 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 unspecified tester or other measuring device.
NOTE: Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated using air bag warning lamp each time repair is finished. If malfunction is still observed, proceed to the next step. When malfunction is eliminated, further repair work is not required.
  1. HARNESS CONNECTOR 

    Visually inspect all applicable harness connectors for the following:

    • Visible damage to connector or terminal
    • Loose terminal
    • Poor connection
      NOTE: All harness connectors should be inspected from the air bag diagnosis sensor unit to the end component (including any in-line connectors).

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Perform one of the following repairs:

    • Visible damage: Replace the harness.
    • Loose terminal: Secure the terminal.
    • Poor connection: Secure the connection.
  2. CONFIRM DTC 
    1. Reconnect all harness connectors.
    2. Turn ignition switch ON.
    3. Check for DTC using CONSULT.

    Is DTC still current?

    YES

    GO TO 3.

    NO

    Refer to Intermittent Incident .

  3. WIRING HARNESS 

    Check the wiring harness for visible damage.

    NOTE: The entire wiring harness should be inspected from the air bag diagnosis sensor unit to the end component (including any in-line connectors).

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Replace the harness.

  4. CONFIRM DTC 
    1. Reconnect all harness connectors.
    2. Turn ignition switch ON.
    3. Check for DTC using CONSULT.

    Is DTC still current?

    YES

    GO TO 5.

    NO

    Refer to Intermittent Incident .

  5. LH SIDE REAR CURTAIN AIR BAG MODULE 
    1. Replace the LH side rear curtain air bag module. Refer to Removal and Installation .
    2. Turn ignition switch ON.
    3. Check for DTC using CONSULT.

    Is DTC still current?

    YES

    GO TO 6.

    NO

    Clear DTC. Inspection End.

  6. AIR BAG DIAGNOSIS SENSOR UNIT 
    1. Replace the air bag diagnosis sensor unit. Refer to Removal and Installation .
    2. Turn ignition switch ON.
    3. Check for DTC using CONSULT.

    Is DTC still current?

    YES

    GO TO 7.

    NO

    Clear DTC. Inspection End.

  7. RELATED HARNESS 

    Replace the related harness.

    END

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