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Home › Subaru › 2013 › BRZ Limited, Automatic Trans › Repair and Diagnosis › External Pages › Different car › Section 122 (Key Warning System) › Key Warning System › Key Reminder Buzzer Does Not Sound › Inspection steps

Inspection steps

WARNING: This page is about a different car, the 2019 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Because the key warning system includes functions that use CAN communication, first check if any problem is present in the CAN communication function according to "How to troubleshoot". Next, perform the following troubleshooting procedure.
  1. Reading values with SSM4 (front door courtesy light switch)
    1. Connect the SSM4 to the DLC3.
    2. Turn IG SW to ON.
    3. Turn on the SSM4.
    4. Enter the following menu. [Body Control] →[Data monitor]
    5. Using SSM4, read the data list according to the screen displays.
    PART NAME DESCRIPTION - MAIN BODY

    Item Name Description/display range Normal value Remarks
    [D Door Courtesy] Driver's door courtesy light switch signal/ON or OFF ON: Driver's door is open
    OFF: Driver's door is closed    		 -

    Criteria: When the unlock warning switch is operated, the display is changed as indicated in the table

    NG: To Lighting system (Door courtesy light switch circuit) (Refer to DOOR COURTESY LIGHT CIRCUIT )

    OK: Go to the next step

  2. Reading values with SSM4 (key unlock warning switch)
    1. Connect the SSM4 to the DLC3.
    2. Turn IG SW to ON.
    3. Turn on the SSM4.
    4. Enter the following menu. [Body Control] →[Data monitor]
    5. Using SSM4, read the data list according to the screen displays.
    PART NAME DESCRIPTION - MAIN BODY

    Item Name Description/display range Normal value Remarks
    [Key Unlock Warning SW] Unlock warning switch signal/OFF or ON OFF: Ignition key is not inserted
    ON: Ignition key is inserted    		 -

    Criteria: When the unlock warning switch is operated, the display is changed as indicated in the table.

    NG: Go to step  4.

    OK: Go to the next step below

  3. Inspecting combination meter ASSY (buzzer operation)
    1. Remove the key from the key cylinder, turn the light control switch for headlight dimmer switch ASSY to the tail position, and open the driver's door.

      Criteria: The light warning buzzer sounds

      NOTE: The key warning system sounds the buzzer integrated in the combination meter and activates the lockout prevention function. This buzzer is also used for the light warning system. Therefore, check that the combination meter buzzer operates to alert the user to the light left illuminated.

    NG: Replace the combination meter ASSY

    OK: Go to the next step

    Replacement of the main body ECM (multiplex network body ECM)

  4. Inspecting unlock warning switch ASSY
    1. Remove the unlock warning switch ASSY. (Refer to UNLOCK WARNING SWITCH ASSY )
    2. Inspect the unlock warning switch ASSY. (Refer to UNIT INSPECTION )

    NG: Replace the unlock warning switch ASSY (Refer to UNLOCK WARNING SWITCH ASSY )

    OK: Go to the next step below

  5. Inspecting wiring harness and connector (main body ECM - unlock warning switch)
    1. Disconnect the unlock warning switch ASSY connector D53.
    2. Disconnect the main body ECM (multiplex network body ECM) connector D5.
    3. Measure the voltage and resistance according to the following table.
    VOLTAGE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    D53-1 - Chassis ground Always 11 to 14V
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    D53-2 - D5-22 Always 1 Ωor less
    D53-2 - Chassis ground Always 10 kΩ or more
    G12589202Courtesy of SUBARU OF AMERICA, INC.

    NG: Repair or replacement of wiring harness or connector

    OK: Go to the next step

    Replacement of the main body ECM (multiplex network body ECM)

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