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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 B1622: Side Airbag Sensor RH Lost Communication; DTC B1623: Side Airbag Sensor RH Initialization Error >> Inspection steps

Inspection steps

CAUTION: Before performing the diagnosis, refer to the PRECAUTIONS .
  1. Check poor contact of connectors.
    1. Check for poor contact of the connectors between the airbag control module and the side airbag sensor RH.

    Criteria: No fault is found.

    NG: Replace the airbag rear harness along with the body harness.

    OK: Go to next step

  2. Check airbag rear harness (between airbag control module and side airbag sensor RH).
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Disconnect the connector (G17) from the seat belt pretensioner RH.
    3. Disconnect the connector (G11) from the curtain airbag module RH.
    4. Disconnect the connector (Gc1) of the side airbag module RH.
    5. Disconnect the connector (D27, G19, H32) of the airbag control module.
    6. Connect the connector (1AG) in the test harness AG to the connector B.
    7. Connect the connector 2V in the test harness V to the connector C.
    8. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (5AG) No. 14 - (3V) No. 1 Always Less than 10 Ω
    (5AG) No. 16 - (3V) No. 2 Always Less than 10 Ω
    G12589662Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the airbag rear harness along with the body harness.

    OK: Go to next step

  3. Check airbag rear harness (between airbag control module and side airbag sensor RH).
    1. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (3V) No. 1 - chassis ground Always 1 MΩ or more
    (3V) No. 2 - chassis ground Always 1 MΩ or more
    (3V) No. 1 - (3V) No. 2 Always 1 MΩ or more
    G12589663Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the airbag rear harness along with the body harness.

    OK: Go to next step

  4. Check DTC
    G12589664Courtesy of SUBARU OF AMERICA, INC.
    1. Connect all connectors.
    2. Clear the memory.
    3. Perform the reproduction procedure.
    4. Read the DTC. (Current malfunction)

      Criteria: DTC B1623 is not displayed.

    NG: Go to step  6.

    OK: Go to next step

  5. Check DTC

    Criteria: No other DTC is displayed.

    NG: Perform diagnosis for the displayed DTC.

    OK: Go to next step

    Complete

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

      Criteria: DTC B1623 is not displayed.

    G12589665Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the curtain airbag sensor RH. Replace the airbag control module if it does not operate properly even after replacing the sensor.

    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

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