ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2284

DTC Code DTC Name
B2284 Brake Signal Malfunction

DESCRIPTION

The certification ECU (smart key ECU assembly) receives brake signal information from 2 sources. It receives a signal from the stop light switch assembly via a direct line, and a signal from the ECM via CAN. If the information from these 2 sources is inconsistent, this DTC will be stored.

Tech Tips

When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2284 The brake signal information from the direct line and the brake signal information from the ECM via CAN communication are inconsistent (1-trip detection logic*).

  • AM2 No. 2 fuse

  • STOP fuse

  • Certification ECU (smart key ECU assembly)

  • SFI system

  • Wire harness or connector

Connect the cable to the negative (-) battery terminal, turn the brakes off for 20 seconds or more and then turn them on for 20 seconds or more.

Then depress the brake pedal for 20 seconds or more.

*: Only output while a malfunction is present and the engine switch is on (IG)

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected

When the electrical key transmitter sub-assembly is inside the vehicle, the engine does not start even though an engine start operation is performed (the entry key indicator in the combination meter assembly does not illuminate in green). However, if the engine switch is pressed and held for a certain period of time after the power source mode is changed to on (ACC), the engine can be started.


  • When a direct line ON malfunction is present, the engine can be started by pressing the engine switch even if the brakes are off.

  • When a direct line OFF malfunction is present, the engine cannot be started by pressing the engine switch even if the brakes are on.

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Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2284

    Power Source Control

  • Stop Light Switch1


    Engine

  • ST1

 -

WIRING DIAGRAM

A004IGVE02

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the GTS and vehicle begins.

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Source Control / Data List.

    5. According to the display on the GTS, read the Data List.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Switch1 State of brake pedal / OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal depressed

      • Use this item to determine whether the stop light switch is malfunctioning.

      • The engine cannot be started when this item is "OFF".

      • When this item is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.
      OK
      ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.
      Result
      Result Proceed to
      NG A
      OK B

    B

    GO TO SFI SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A004IP3E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D48-2 (+B) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND)

    A004KBGE01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NOISE FILTER - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A13 noise filter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-18 (STP1) - A13-4 Always Below 1 Ω
      D48-18 (STP1) - Body ground Always 10 kΩ or higher
    4. A004JB6E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the A13 noise filter connector.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D48-18 (STP1) - Body ground Brake pedal released Below 1 V
      Brake pedal depressed 9 V or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR