Dtc B2284 Brake Signal Malfunction

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM)

CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

INSPECT FUSE (STOP SW)

CHECK CONNECTORS

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

CHECK WIRE HARNESS (BATTERY - POWER SOURCE CONTROL ECU)

INSPECT STOP LIGHT SWITCH

READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

DTC B2284 Brake Signal Malfunction


DESCRIPTION

This DTC is output when: 1) the brake signal circuit between the power source control ECU and the stop light switch is malfunctioning; and 2) the BEAN information is inconsistent.
HINT:
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.
DTC Detection Condition
Trouble Area
B2284
Communication or communication line is abnormal between the power source control ECU and the stop light switch
  1. Stop light switch
  2. Multiplex communication system
  3. CAN communication system
  4. ECM
  5. Power source control ECU
  6. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction


INSPECTION PROCEDURE

HINT:
Before performing the inspection, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on when the brake pedal is depressed, refer to the page shown in the brackets (Click here).
1.CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM)

  1. Delete the DTC (Click here).

  1. Check for the multiplex network communication system DTCs B1210, B1214 and B1215.

    HINT:
    If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first (Click here).
    OK:
    No DTC is output.


NG
GO TO MULTIPLEX COMMUNICATION SYSTEM
OK


2.CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

  1. Delete the DTC (Click here).

  1. Check for the CAN communication system DTC U0146.

    HINT:
    If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (LHD: Click here, RHD: Click here).
    OK:
    No DTC is output.


NG
GO TO CAN COMMUNICATION SYSTEM
OK


3.INSPECT FUSE (STOP SW)

  1. Remove the STOP SW fuse from the cowl side J/B RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


4.CHECK CONNECTORS

  1. Check that the connectors are securely connected and the terminals are not deformed or loose.

    OK:
    The connectors are securely connected and the terminals are not deformed or loose.


NG
REPAIR OR REPLACE CONNECTORS
OK


5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction

  1. Disconnect the ECU connector.

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-6 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK WIRE HARNESS (BATTERY - POWER SOURCE CONTROL ECU)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-1 (STP) - Body ground
    		Brake pedal released
    		Below 1 V
    J55-1 (STP) - Body ground
    		Brake pedal depressed
    		10 to 14 V


OK
Go to step 8
NG


7.INSPECT STOP LIGHT SWITCH


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction

  1. Remove the switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Switch pin free
    		Below 1 Ω
    3 - 4
    		Switch pin free
    		10 kΩ or higher
    1 - 2
    		Switch pin pushed in
    		10 kΩ or higher
    3 - 4
    		Switch pin pushed in
    		Below 1 Ω


NG
REPLACE STOP LIGHT SWITCH
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Reconnect the connectors.

  1. Check the DATA LIST for proper functioning of the stop light switch.

    Power Source Control:
    Item
    		Measurement Item/Display (Range)
    		Normal Condition
    		Diagnostic Note
    Stop Lamp SW1
    		Stop light switch 1/ ON or OFF
    		ON: Brake pedal depressed
    OFF: Brake pedal released
    		-
    OK:
    ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

REPLACE ECM