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

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DTC Code DTC Name
B2284 Brake Signal Malfunction
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DESCRIPTION

This DTC is stored when the brake signal sent via direct line and the brake signal sent via CAN communication do not match.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2284 Brake Signal Malfunction The brake signal sent via direct line and the brake signal sent via CAN communication do not match. (1-trip detection logic*)

  • Electronically controlled brake system

  • Stop light switch assembly

  • Certification ECU (smart key ECU assembly)

  • Harness or connector
  • DTC Output Confirmation Operation:

  • Connect the cable to the negative (-) auxiliary battery terminal, release the brake pedal and wait at least 20 seconds. Then depress the brake pedal for 20 seconds or more.

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected

With the electrical key transmitter sub-assembly in the cabin, even if a hybrid control system start operation is performed, the hybrid control system does not start (the key indicator display is not displayed on the multi-information display). However, the hybrid control system can be started by turning the power switch on (ACC) and then pressing and holding it.


  • If there is a malfunction when the brake signal sent via direct line is on, the hybrid control system can be started by pressing the power switch with the brake pedal released.

  • If there is a malfunction when the brake signal sent via direct line is off, the hybrid control system cannot be started by pressing the power switch with the brake pedal depressed.

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Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2284
  • Power Source Control

  • Stop Light Switch1
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power switch switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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  • Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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PROCEDURE


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    READ VALUE USING GTS (STOP LIGHT SWITCH1)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      1. Body Electrical > Power Source Control > Data List
        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 if the stop light switch assembly is malfunctioning.

        • The hybrid control system cannot be started when this item is OFF.

        • If the stop light switch assembly is malfunctioning, the hybrid control system can be started by pressing and holding the power switch for a certain period of time.



      1. Body Electrical > Power Source Control > Data List
        Tester Display
        Stop Light Switch1




      OK
      The GTS display changes correctly in response to the brake pedal operation.
      Result
      Proceed to
      OK
      NG

    • OK

      GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)Click here

    • NGClick here
  2. Click here

    CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)


    1. Disconnect the L31 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A77 hybrid vehicle control ECU assembly connector.

    3. Disconnect the G82 shift control ECU connector.

    4. Disconnect the A9 skid control ECU (brake actuator assembly) connector.

    5. Disconnect the cable from the negative (-) auxiliary battery terminal.

    6. Disconnect the L111 No. 3 semiconductor power integration ECU connector.

    7. Reconnect the cable from the negative (-) auxiliary battery terminal.

    8. Disconnect the A3 stop light switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L31-25 (STP1) - A3-2 (L) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the certification ECU (smart Key ECU assembly) connector.

    2. Reconnect the A3 stop light switch assembly connector.

    3. B004W44C20
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L31-25 (STP1) - Body ground Brake pedal released → depressed 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    • NG

      REPLACE STOP LIGHT SWITCH ASSEMBLYClick here