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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 B1836: Open In Curtain Airbag LH Squib Circuit >> 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 curtain 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 curtain 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 (H30) from the curtain airbag module 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.

    G12589829Courtesy of SUBARU OF AMERICA, INC.

    NG: Replace the curtain airbag module.

    OK: Go to next step

  3. Check airbag rear harness (curtain airbag module harness LH).
    G12589830Courtesy 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. Disconnect the connector (Hb1) from the side airbag module LH.
    4. Disconnect the airbag resistor from the connector (2N) in the test harness N.
    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
    (6AG) No. 1 - (2N) No. 2 Always Less than 10 Ω
    (6AG) No. 3 - (2N) No. 1 Always Less than 10 Ω

    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 B1836 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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