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Home >> Subaru >> 2013 >> BRZ Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Entry Start System Start System (Keyless Start)) >> Entry & Start System (Start Function) >> DTC B2284: Brake Signal (Cable-Information Does Not Match To BEAN-Information) >> Inspection steps

Inspection steps

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • The entry & start system has functions that use the CAN communication. Before performing troubleshooting, perform the inspection in "How to troubleshoot", and check that there are no communication problems. (Refer to HOW TO PROCEED WITH TROUBLESHOOTING )
  • Before replacing the collation ECM (smart key ECM ASSY), refer to "entry & start system (entry function)". (Refer to ENTRY & START SYSTEM (ENTRY FUNCTION) )
  • After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
  • Before performing the following inspection steps, check the fuses related to this system.
  1. Reading the values using the SSM4 (stop light switch ASSY)
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Input the following menus: [Keyless Access(Power Supply ECM)] →[Data monitor]
    5. Based on the contents of the SSM4 display, read the [Data monitor].
      RANGE DESCRIPTION - POWER SOURCE CONTROL

      Tester display Measurement items/range Normal condition Notes for diagnosis
      [Stop Light Switch 1] Brake pedal status/[OFF] or [ON] OFF: The brake pedal is not being depressed.
      ON: The brake pedal is being depressed.      		  
      • Using this item, determine if there is any problem with the stop light switch.
      • When this item is [OFF], the engine will not start.
      • If there is a problem caused by this item, if you press the engine switch for a certain amount of time, you can start the engine.

      Criteria: "ON" (depressing the brake pedal) and "OFF" (your foot removed from the brake pedal) are displayed on the screen.

      RESULT DESCRIPTION

      Result Go to
      NG A
      OK B
      1. Go to next step
      2. See the EFI system
  2. Checking the harnesses and connectors (power supply) (Refer to DTC B2274 ACC CIRCUIT ABNORMAL )

    OK: Go to next step

    NG: Repair or replacement of the harnesses or connectors of the circuits that connect to the power source

  3. Checking the harnesses and connectors (grounding) (Refer to DTC B2274 ACC CIRCUIT ABNORMAL )

    OK: Go to next step

    NG: Repair or replacement of the harnesses or connectors

  4. Checking the harnesses and connectors (collation ECM (smart key ECM ASSY) - stop light switch ASSY)
    1. Remove the D48 connector of the collation ECM (smart key ECM ASSY).
    2. Remove the A22 connector of the stop light switch ASSY
    3. Measure the resistance according to the following table.
      STANDARD VALUE SPECIFICATION - RESISTANCE

      Inspection terminals Inspection conditions Standard value
      D48-18 (STP1) - A13-4 Always 1 Ω or less
      D48-18 (STP1) - chassis ground Always 10 kΩ or more
    4. Reconnect the A22 connector of the stop light switch ASSY.
    5. Measure the voltage according to the following table.

      Voltage

      STANDARD VALUE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      D48-18 (STP1) - chassis ground The brake pedal is not being depressed. 1 V or less
      The brake pedal is being depressed. 9V or more
      G12589379Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Repair or replacement of the harnesses or connectors

      Replacement of the collation ECM (smart key ECM ASSY)

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