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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 B1660: Passenger's Airbag Indicator Failure >> Inspection steps

Inspection steps

CAUTION: Before performing the diagnosis, refer to the PRECAUTIONS .
  1. Check poor contact of connectors.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Check whether the connectors between the airbag control module and the airbag indicator are securely connected.

    Criteria: No fault is found.

    NG: Repair the bulkhead harness. Or replace the airbag main harness along with the body harness.

    OK: Go to next step

  2. Check airbag main harness.
    1. Disconnect the connector (D27, G19, H32) from the airbag control module.
    2. Connect the battery ground terminal and turn the ignition switch to ON.
    NOTE: In the normal condition, neither ON nor OFF will illuminate.

    Criteria: The passenger's airbag indicator illuminates.

    G12589698Courtesy of SUBARU OF AMERICA, INC.

    NG: Go to step  4.

    OK: Go to next step

  3. Check airbag main harness.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Remove the clock ASSY and disconnect the connector (D18).
    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
    (2AG) No. 9 - (2AG) No. 8 Always 1 MΩ or more
    (2AG) No. 9 - chassis ground Always 1 MΩ or more
    (2AG) No. 8 - chassis ground Always 1 MΩ or more
    G12589699Courtesy of SUBARU OF AMERICA, INC.

    NG: Repair the bulkhead harness. Or replace the airbag main harness along with the body harness.

    OK: Go to next step

    Replace the clock ASSY

  4. Check airbag main harness.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Disconnect the connector (D27, G19, H32) from the airbag control module, and connect the connector (1AG) in the test harness AG.
    3. Connect the connectors (7AG) and (8AG) in the test harness AG.
    4. Connect the battery ground terminal and turn the ignition switch to ON.

      Criteria: The passenger's airbag indicator illuminates.

    G12589700Courtesy of SUBARU OF AMERICA, INC.

    NG: Go to step  5.

    OK: Go to next step

    Replace the airbag control module.

  5. Check airbag main harness.
    1. Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait for 60 seconds or more.
    2. Remove the clock ASSY and disconnect the connector (D18).
    3. Measure the resistance between the connector (2AG) in the test harness AG and the connector (D18).
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (2AG) No. 9 - (D18) No. 5 Always Less than 1 Ω
    (2AG) No. 8 - (D18) No. 3 Always Less than 1 Ω
    G12589701Courtesy of SUBARU OF AMERICA, INC.

    NG: Repair the bulkhead harness. Or replace the airbag main harness along with the body harness.

    OK: Go to next step

  6. Check body harness.
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the connector (D18) and the chassis ground.
    VOLTAGE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    (D18) No. 10 - chassis ground Always 10 V or more
    G12589702Courtesy of SUBARU OF AMERICA, INC.

    NG: Check the power circuit.

    OK: Go to next step

    Replace the clock ASSY

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