LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag System (Diagnostics) >> SRS Airbag System >> DTC B1627: Side Airbag Sensor LH Lost Communication; DTC B1628: Side Airbag Sensor LH 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 LH.

      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 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 (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. 8 - (3V) No. 2 Always Less than 10 Ω
    (5AG) No. 10 - (3V) No. 1 Always Less than 10 Ω
    G12589667Courtesy 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 LH).
    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
    G12589668Courtesy of SUBARU OF AMERICA, INC.

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

    OK: Go to next step

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

      Criteria: DTC B1628 is not displayed.

    G12589669Courtesy of SUBARU OF AMERICA, INC.

    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 LH.
    3. Connect all connectors.
    4. Clear the memory.
    5. Perform the reproduction procedure.
    6. Read the DTC. (Current malfunction)

      Criteria: DTC B1628 is not displayed.

    G12589670Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the curtain airbag sensor LH. 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

scientia non olet · About LEMON Manuals