DTC    B2284    Brake Signal Malfunction

for Preparation Click here


DESCRIPTION

The power management control ECU 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 skid control ECU assembly via CAN communication. If the information from these 2 sources is inconsistent, this DTC will be stored.

HINT:
  1. When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).
  2. When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.


DTC No.
DTC Detection Condition
Trouble Area
B2284
Stop light switch assembly operation information received by the power management control ECU from the stop light switch assembly via a direct line and stop light switch assembly information from the skid control ECU assembly via CAN are inconsistent.
  1. AM2 fuse
  2. STOP fuse
  3. Stop light switch assembly
  4. CAN communication system
  5. Skid control ECU assembly
  6. Power management control ECU
  7. Wire harness or connector
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.

DTC Code
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 ECU via CAN communication are inconsistent (1-trip detection logic*).
  1. AM2 fuse
  2. STOP fuse
  3. Stop light switch assembly
  4. CAN communication system
  5. Skid control ECU assembly
  6. Power management control ECU
  7. Wire harness or connector
Connect the cable to the negative (-) auxiliary battery terminal, turn the brakes off for 20 seconds or more and then turn them on for 20 seconds or more.
  1. *: Only output while a malfunction is present and the power 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 key is inside the vehicle, the hybrid control system does not start even though a hybrid control system start operation is performed (the power switch indicator does not illuminate in green). However, if the power switch is pressed and held for a certain period of time after the power source mode is changed to on (ACC), the hybrid control system can be started.
  1. When a direct line ON malfunction is present, the hybrid control system can be started by pressing the power switch even if the brakes are off.
  2. When a direct line OFF malfunction is present, the hybrid control system cannot be started by pressing the power switch even if the brakes are on.
-

WIRING DIAGRAM


B230105E15


INSPECTION PROCEDURE

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

NOTICE:
  1. When using the intelligent tester 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 intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:
    for Power Source Control: Body / Power Source Control / DTC.
    for Entry&Start: Body / Entry&Start / DTC.
  2. The push-button 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).
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  4. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.


HINT:

Related Data List and Active Test Items 
DTC
Data List Item
Active Test Item
B2284
Power Source Control
  1. Stop Light Switch1
ABS/VSC/TRC
  1. Stop Light SW
-

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

  1. Disconnect the H3 and H4 connectors from the power management control ECU.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H3-1 (AM22) - Body ground
    		Always
    		9.5 to 16 V
    H4-7 (AM21) - Body ground
    		Always
    		9.5 to 16 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		 Specified Condition
    H3-5 (E01) - Body ground
    		Always
    		Below 1 Ω
    H3-6 (E1) - Body ground
    		Always
    		Below 1 Ω
    H4-4 (E12) - Body ground
    		Always
    		Below 1 Ω
    H4-5 (E02) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT STOP LIGHT SWITCH ASSEMBLY


    C178168E24

  1. Remove the stop light switch assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Pushed
    		10 kΩ or higher
    1 - 2
    		Not pushed
    		Below 1 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (Stop Light Switch Assembly)
    *b
    		Free
    *c
    		Pushed in



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
OK


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

  1. Disconnect the A20 connector from the power management control ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A20-23 (STP) - A25-1
    		Always
    		Below 1 Ω
    A20-23 (STP) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH ASSEMBLY)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

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

  1. Read the Data List according to the display on the intelligent tester.

    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
    		-

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



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DTC C1249/49) (Click here)