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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Horn System) >> Horn Switch >> Inspection >> Check Horn Switch

Check Horn Switch

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

Before handling the airbag system components, refer to "CAUTION" of "General Description" in "AIRBAG SYSTEM". Ref. to  AIRBAG SYSTEM>GENERAL DESCRIPTION>CAUTION 

  1. CHECK HORN SWITCH TERMINAL  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. Ref. to REPAIR CONTENTS>NOTE>BATTERY
    3. Remove the driver's airbag module. Ref. to AIRBAG SYSTEM>DRIVER'S AIRBAG MODULE>REMOVAL
    4. Check the connecting condition of horn switch connector.
    5. Measure the resistance between connectors.
      G14612484Courtesy of SUBARU OF AMERICA, INC.
      Terminals Standard
      Horn switch terminal - ground terminal Less than 1 Ω

    Is the measured value within the standard value?

    Yes  : Go to  2.

    No  : It is possible that there is an open circuit between horn switch terminal and ground terminal. Replace the satellite switch assembly. Ref. to POWER ASSISTED SYSTEM (POWER STEERING)>STEERING WHEEL

  2. CHECK DRIVER'S AIRBAG MODULE  .

    Measure the resistance between horn plate and snap pin hook.

    CAUTION:

    Measure the resistance while lifting the snap pin hook so that it does not come in contact with the horn plate. 

    G14612485Courtesy of SUBARU OF AMERICA, INC.
    Terminals Standard
    Horn plate - Snap pin hook 1 MΩ or more

    Is the measured value within the standard value?

    Yes  : Go to  3.

    No  : Replace the driver's airbag module. Ref. to AIRBAG SYSTEM>DRIVER'S AIRBAG MODULE

  3. CHECK DRIVER'S AIRBAG MODULE  .

    Measure the resistance between horn plate and snap pin hook with the snap pin hook in contact with the horn plate.

    CAUTION:

    Measure at all three positions of the snap pin hook. 

    G14612486Courtesy of SUBARU OF AMERICA, INC.
    Terminals Standard
    Horn plate - Snap pin hook Less than 1 Ω

    Is the measured value within the standard value?

    Yes  : Driver's airbag module is normal.

    No  : Replace the driver's airbag module. Ref. to AIRBAG SYSTEM>DRIVER'S AIRBAG MODULE

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