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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 B1821: Open In Side Airbag RH >> 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 module.

    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 (side airbag module harness RH).
    G12589786Courtesy of SUBARU OF AMERICA, INC.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Disconnect the connector (Gc1) of the side airbag module RH.
    3. Disconnect the connector (D27, G19, H32) from the airbag control module.
    4. Disconnect the connector (G17) of the seat belt pretensioner RH.
    5. Disconnect the connector (G11) of the curtain airbag module RH.
    6. Using a probe, measure the resistance between the terminals of connector C.
    CAUTION: When measuring the resistance, make sure that the probe is inserted from the back side (harness side) of the connector. Also, do not insert the probe forcibly.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (Gc1) No. 1 - (Gc1) No. 2 Always Less than 10 Ω

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

    OK: Go to next step

  3. Check airbag control module.
    G12589787Courtesy of SUBARU OF AMERICA, INC.
    1. Connect the connector B to the airbag control module.
    2. Connect the connector (G17) of the seat belt pretensioner RH.
    3. Connect the connector (G11) of the curtain airbag module RH.
    4. Using a test harness AT, short-circuit the terminals 1 and 2 of the connector C.
    5. Connect the battery ground terminal and turn the ignition switch to ON.
    6. Perform the reproduction procedure.
    7. Read the DTC. (Current malfunction)

    Criteria: DTC B1821 is not displayed.

    NG: Replace the airbag control module.

    OK: Go to next step

  4. Check side airbag module.
    G12589788Courtesy of SUBARU OF AMERICA, INC.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Connect the connector (Gc1) of the side airbag module RH.
    3. Connect the battery ground terminal, and clear the memory.
    4. Perform the reproduction procedure.
    5. Read the DTC. (Current malfunction)

    Criteria: DTC B1821 is not displayed.

    NG: Replace the side airbag module.

    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

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