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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 B1800: Short 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.
    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.

    G12589715Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the driver's airbag module.

    OK: Go to next step

  3. Check roll connector and airbag main harness (driver's airbag harness).
    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) from the airbag control module, and connect the connector (1AG) in the test harness AG.
    5. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (2Q) No. 1 - (2Q) No. 2 Always 1 MΩ or more
    G12589716Courtesy of SUBARU OF AMERICA, INC.

    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 B1800 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 airbag main harness (driver's airbag harness).
    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
    (3AG) No. 1 - (3AG) No. 3 Always 1 MΩ or more
    G12589717Courtesy of SUBARU OF AMERICA, INC.

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

    OK: Go to next step

    Replace the roll connector.

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