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 B1802: Short In Driver's Airbag (To Ground) >> 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.
    G12589723Courtesy 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.
    G12589724Courtesy 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. Remove the column cover and disconnect the connector (D52).
    3. Disconnect the airbag resistor from the connector (2Q) in the test harness Q.
    4. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (2Q) No. 1 - chassis ground Always 1 MΩ or more
    (2Q) No. 2 - chassis ground Always 1 MΩ or more

    NG: Replace the roll connector.

    OK: Go to next step

  4. Check airbag main harness (driver's airbag harness).
    G12589725Courtesy of SUBARU OF AMERICA, INC.
    1. Disconnect the test harness Q from the connector E.
    2. Disconnect the passenger's airbag module connector (D30).
    3. Disconnect the connector (D27, G19, H32) from the airbag control module, and connect the connector (1AG) in the test harness AG.
    4. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (3AG) No. 1 - chassis ground Always 1 MΩ or more
    (3AG) No. 3 - chassis ground Always 1 MΩ or more

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

    OK: Go to next step

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

    Criteria: DTC B1802 is not displayed.

    NG: Replace the airbag control module.

    OK: Go to next step

  6. 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