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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 B1905: Short In Front P/T LH >> 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 seat belt pretensioner.

    Criteria: No fault is found.

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

    OK: Go to next step

  2. Check seat belt pretensioner.
    G12589850Courtesy 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 (H22) from the seat belt pretensioner LH.
    3. Connect the connector (1N) in the test harness N to the connector C.
    4. Connect the airbag resistor to the connector (2N) in the test harness N.
    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 seat belt pretensioner.

    OK: Go to next step

  3. Check airbag rear harness (seat belt pretensioner harness LH).
    G12589851Courtesy 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 airbag resistor from the connector (2N) in the test harness N.
    3. Disconnect the connector (Hb1) from the side airbag module LH.
    4. Disconnect the connector (H30) from the curtain airbag module LH.
    5. Disconnect the connector (D27, G19, H32) from the airbag control module, and connect the connector (1AG) in the test harness AG.
    6. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (3AG) No. 10 - (3AG) No. 12 Always 1 MΩ or more

    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 B1905 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

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