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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag System (Diagnostics) >> SRS Airbag System >> DTC B1697: Lost Communication With Door Sensor LH; DTC B1698: Door Sensor LH Initialization Incomplete >> Inspection steps

Inspection steps

CAUTION: Before performing the diagnosis, refer to the PRECAUTIONS .
  1. Check DTC
    1. Check for DTC.

      Criteria: DTC B1627 and B1628 are not displayed.

    NG: Perform diagnosis for the displayed DTC B1627 and B1628.

    OK: Go to next step

  2. Check DTC
    1. Check for DTC.

      Criteria: DTC B1637 and B1638 are not displayed.

    NG: Perform diagnosis for the displayed DTC B1637 and B1638.

    OK: Go to next step

  3. Check poor contact of connectors.
    1. Check for poor contact of the connectors between the airbag control module and the front door impact sensor LH.

      Criteria: No fault is found.

    NG: Replace the airbag rear harness and the door harness.

    OK: Go to next step

  4. Check airbag rear harness and door harness (between curtain airbag sensor LH and door sensor LH).
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Disconnect the connector (H22) from the seat belt pretensioner LH.
    3. Disconnect the connector (H30) from the curtain airbag module LH.
    4. Disconnect the connector (Hb1) of the side airbag module LH.
    5. Disconnect the connector (H25) from the curtain airbag sensor LH.
    6. Connect the connector B of the curtain airbag sensor LH and the connector (2V) in the test harness V.
    7. Disconnect the connector (E4) of the front door impact sensor LH.
    8. Connect the connector E of the front door impact sensor LH and the connector (1H) in the test harness H.
    9. Measure the resistance between the terminals.
    G12589712Courtesy of SUBARU OF AMERICA, INC.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (3V) No. 4 - (3H) No. 5 Always Less than 10 Ω
    (3V) No. 5 - (3H) No. 6 Always Less than 10 Ω

    NG: Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness along with the body harness.

    OK: Go to next step

  5. Check airbag rear harness and door harness (between curtain airbag sensor LH and door sensor LH).
    1. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (3V) No. 4 - chassis ground Always 1 MΩ or more
    (3V) No. 5 - chassis ground Always 1 MΩ or more
    (3V) No. 4 - (3V) No. 5 Always 1 MΩ or more
    G12589713Courtesy of SUBARU OF AMERICA, INC.

    NG: Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness along with the body harness.

    OK: Go to next step

  6. Check DTC
    1. Connect all connectors.
    2. Clear the memory.
    3. Perform the reproduction procedure.
    4. Read the DTC. (Current malfunction)

      Criteria: DTC B1698 is not displayed.

    NG: Go to step  8.

    OK: Go to next step

  7. Check DTC

    Criteria: No other DTC is displayed.

    NG: Perform diagnosis for the displayed DTC.

    OK: Go to next step

    Complete

  8. Check DTC
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Replace the front door impact sensor LH.
    3. Connect all connectors.
    4. Clear the memory.
    5. Perform the reproduction procedure.
    6. Read the DTC. (Current malfunction)

      Criteria: DTC B1698 is not displayed.

    NG: Go to step  10.

    OK: Go to next step

  9. Check DTC

    Criteria: No other DTC is displayed.

    NG: Perform diagnosis for the displayed DTC.

    OK: Go to next step

    Complete

  10. Check DTC
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Replace the curtain airbag sensor LH.
    3. Connect all connectors.
    4. Clear the memory.
    5. Perform the reproduction procedure.
    6. Read the DTC. (Current malfunction)

      Criteria: DTC B1698 is not displayed.

    NG: Replace the airbag control module.

    OK: Go to next step

  11. Check DTC

    Criteria: No other DTC is displayed.

    NG: Perform diagnosis for the displayed DTC.

    OK: Go to next step

    Complete

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