SMART KEY SYSTEM (for Start Function), Diagnostic DTC:B2284

DTC Code DTC Name
B2284 Brake Signal Malfunction

DESCRIPTION

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

Tech Tips

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2284 The brake signal sent via direct line and the brake signal sent via CAN communication (1-trip detection logic*) do not match.
  • AM2 fuse

  • STOP fuse

  • Brake control system

  • Power management control ECU

  • Wire harness or connector

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

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 an hybrid control system start operation is performed, the hybrid control system does not start (the multi-information display message (smart warning light) is not displayed). 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 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 direct line is off, the hybrid control system cannot be started by pressing the power switch with the brake pedal depressed.

-

WIRING DIAGRAM

A01HVZSE01

INSPECTION PROCEDURE

Tech Tips

Check the connector connection to the terminal to make sure that there is no abnormality such as a loose connection, deformation, etc.

Note


  • When using the Techstream with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus:

    for Power Source Control: Body Electrical / Power Source Control / DTC.

    for Smart Key: Body Electrical / Smart Key / DTC.

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

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

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

Tech Tips

Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2284

    Power Source Control

  • Stop Light Switch1


    ABS/VSC/TRAC

  • Stop Light SW

-

PROCEDURE


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


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

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

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Specified Condition
      Stop Light Switch1 Stop light switch1/ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released


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

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

      • When this item is malfunctioning, the hybrid control system can be started by pressing and holding the power switch for a certain period of time.

      OK
      ON (brake pedal is depressed) and OFF (brake pedal is released) appear on the screen.

    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A01HSXQE07
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)


    1. Disconnect the I3 and I4 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I3-1 (AM22) - Body ground Power switch off 11 to 14 V
      I4-7 (AM21) - Body ground Power switch off 11 to 14 V

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (GROUND)

    A01HSXQE08
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I3-5 (E01) - Body ground Always Below 1 Ω
      I3-6 (E1) - Body ground Always Below 1 Ω
      I4-4 (E12) - Body ground Always Below 1 Ω
      I4-5 (E02) - Body ground Always Below 1 Ω

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the A33 connector from the stop light switch assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A39-23 (STP) - A33-1 Always Below 1 Ω
      A39-23 (STP) or A33-1 - Body ground Always 10 kΩ or higher
    3. Reconnect the A33 stop light switch assembly connector.

    4. A01HT6JE11
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the A39 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A39-23 (STP) - Body ground Brake pedal released 1 V or less
      Brake pedal depressed 9 V or higher

    NG
    OK