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Home >> Subaru >> 2016 >> BRZ Series.HyperBlue >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (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 2014 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 SSM3 (stop light switch ASSY)
    1. Connect the SSM3 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM3.
    4. Input the following menus: [Keyless access system] →[Power Supply ECM] →[Current Data Display & Save]
    5. Based on the contents of the SSM3 display, read the [Current Data Display & Save].
      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 stepped on
      [ON]: The brake pedal is being stepped on
      • 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" (stepping on the brake pedal) and "OFF" (your foot removed from the brake pedal) are displayed on the screen.

      RESULT

      Result Go to
      NG A
      OK B

      B: See the FUEL INJECTION SYSTEM

      A: Go to Next Step

  2. Checking the harnesses and connectors (power supply) (Refer to INSPECTION STEPS  )

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

    OK: Go to Next Step

  3. Checking the harnesses and connectors (grounding) (Refer to INSPECTION STEPS  )

    NG: Repair or replacement of the harnesses or connectors

    OK: Go to Next Step

  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.
      RESISTANCE

      Inspection terminals Inspection conditions Standard value
      D48-18 (STP1) - A13-4 Always 1 Ωor 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

      Inspection terminals Inspection conditions Standard value
      D48-18 (STP1) - chassis ground The brake pedal is not being stepped on. 1 V or less
      The brake pedal is being stepped on. 9 V or more
      Fig 1: Identifying Stop Light Switch Assembly Connector STP1 Terminal
      G08553123Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of the harnesses or connectors

      OK: Replacement of the collation ECM (smart key ECM ASSY)

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