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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 B1801: Open In Driver's Airbag >> 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 driver's airbag module. Criteria: No fault is found.

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

    OK: Go to next step

  2. Check driver's airbag module.
    G12589719Courtesy 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 (z7) from the driver's airbag module.
    3. Connect the connector (1Q) in the test harness Q to the connector E.
    4. Connect the airbag resistor to the connector (2Q) in the test harness Q.
    5. Connect the battery ground terminal and turn the ignition switch to ON.

    Criteria: Airbag warning light remains on even after 6 seconds have passed.

    NG: Replace the driver's airbag module.

    OK: Go to next step

  3. Check roll connector and airbag main harness (driver's airbag harness).
    G12589720Courtesy 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 passenger's airbag module connector (D30).
    3. Disconnect the airbag resistor from the connector (2Q) in the test harness Q.
    4. Disconnect the connector (D27, G19, H32) of the airbag control module.
    5. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

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

    NG: Go to step  6.

    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 B1801 is not displayed.

    NG: Replace the airbag control 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

  6. Check roll connector.
    G12589721Courtesy of SUBARU OF AMERICA, INC.
    1. Remove the column cover and disconnect the connector (D52).
    2. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

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

    NG: Replace the roll connector.

    OK: Go to next step

    Replace the airbag main harness along with the body harness.

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