ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2284, P0504

DTC Code DTC Name
B2284 Brake Signal Malfunction
P0504 Brake Switch "A" / "B" Correlation

DESCRIPTION

This DTC is stored when the cable information of the brake signal and CAN information of the brake signal are inconsistent.

Tech Tips

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 is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code DTC Detection Condition Trouble Area

B2284

P0504

 The cable information of the brake signal and CAN information of the brake signal are inconsistent.

  • STOP fuse

  • AM2 NO. 2 fuse

  • Stop light switch assembly

  • CAN communication system

  • SFI system (for ZR Series Engine)

  • ECD system (for 1WW Engine)

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A01IOLFE01

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.

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

Tech Tips

Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

PROCEDURE


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


    1. A01IUFQE04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H71 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H71-2 (AM21) - Body ground Always 9.5 to 16 V
      H71-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H71 power management control ECU connector.

    2. A01IUFQE05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H71-6 (GND) - Body ground Always Below 1 Ω
      H71-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H70 power management control ECU connector.

    2. Disconnect the A55 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
      H70-11 (STP1) - A55-3 (L) Always Below 1 Ω
      H70-11 (STP1) - Body ground Always 10 kΩ or higher
      A55-2 (GND)- Body ground Always Below 1 Ω

    4. Reconnect the A55 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
      H70-11 (STP1) - Body ground Brake pedal not depressed Below 1.0 V
      Brake pedal depressed ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  5. 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.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Switch1 Stop light switch 1 / ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -
      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
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    CHECK SFI SYSTEM*1 OR ECD SYSTEM*2 Click here

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  6. CHECK SFI SYSTEM*1 OR ECD SYSTEM*2


    1. Check the SFI system*1 or ECD system*2.


      • *1: for ZR Series Engine

      • *2: for 1WW Engine

      Tech Tips


      • for 1ZR-FAE:


        • If it is necessary to refer to the SFI system, refer to the following procedure Click here.

      • for 2ZR-FAE:


        • If it is necessary to refer to the SFI system, refer to the following procedure Click here.

      • for 1WW:


        • If it is necessary to refer to the ECD system, refer to the following procedure Click here.

      Result
      Result Proceed to
      for ZR Series Engine A
      for 1WW Engine B

    B

    GO TO ECD SYSTEM

    A

    GO TO SFI SYSTEM