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

DTC Code DTC Name
B2284 Brake Signal Malfunction

DESCRIPTION

This DTC is stored when a mismatch between the brake signal from the direct line and the brake signal sent via CAN communication is detected.

Tip:

  • When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).

  • 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.

Detection Item

DTC Detection Condition

Trouble Area

B2284

Brake Signal Malfunction

The brake signal information from the direct line and the brake signal information from the ECU via CAN communication are inconsistent (1-trip detection logic*).

  • STOP fuse

  • AM2 fuse

  • Stop light switch assembly

  • Engine control system

  • Power management control ECU

  • Harness or connector

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

DTC No.

DTC Output Confirmation Operation

B2284

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

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

When the key is inside the vehicle, the engine does not start even though an engine start operation is performed (the engine switch indicator 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.

-

WIRING DIAGRAM

C278452E01

CAUTION / NOTICE / HINT

Note:

  • When using the intelligent tester with the engine 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 intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

  • 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).

  • 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.

Tip:
Table 2. Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2284

  • Power Source Control

  • Stop Light Switch1

  • Powertrain / Engine and ECT

  • ST1

-

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, read the Data List.

      Body Electrical > Power Source Control > Data List

      Tester Display

      Stop Light Switch1

      Body Electrical > Power Source Control > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Stop Light Switch1

      State of brake pedal

      ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      • 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) or OFF (brake pedal released) appears on the screen according to the stop light switch condition.

      Result

      Result

      Proceed to

      NG

      A

      OK

      for 1UR-FE w/ EGR System

      B

      for 1UR-FE w/o EGR System

      C

      for 1GR-FE

      D
    B

    GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    C

    GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    D

    GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    A

  2. CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

    1. Disconnect the G39 power management control ECU connector.

    2. A207890C01

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G39-2 (AM21) - Body ground

      Always

      9.5 to 14 V

      G39-1 (AM22) - Body ground

      Result

      Result

      OK

      NG
    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

    1. A207890C02

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G39-6 (GND) - Body ground

      Always

      Below 1 Ω

      G39-5 (GND2) - Body ground

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Disconnect the G38 power management control ECU connector.

    2. Disconnect the A67 stop light switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G38-11 (STP1) - A67-2 (L)

      Always

      Below 1 Ω

      G38-11 (STP1) or A67-2 (L) - Body ground

      Always

      10 kΩ or higher

      A67-3 (GND) - Body ground

      Always

      Below 1 Ω
    4. A207893C04

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Reconnect the A67 stop light switch assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G38-11 (STP1) - Body ground

      Brake pedal not depressed

      Below 1 V

      Brake pedal depressed

      ([Voltage at terminal AM21 or AM22] minus 2.0 V) or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE POWER MANAGEMENT CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR