Dtc B2284 Brake Signal Malfunction (Cable-Information Does Not Match To Bean-Information)

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Starting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

INSPECT FUSE (STOP SW)

INSPECT STOP LIGHT SWITCH

CHECK WIRE HARNESS (STOP LIGHT SWITCH - POWER SOURCE CONTROL ECU AND BATTERY)

CHECK POWER SOURCE CONTROL ECU

DTC B2284 Brake Signal Malfunction (Cable-Information does not Match to Bean-Information)


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.

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

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction (Cable-Information Does Not Match To Bean-Information)


INSPECTION PROCEDURE

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

  1. Check the Data List for proper functioning of the stop light switch.

    Power source control ECU:

    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) appears on screen.


NG
Go to step 2
OK

REPLACE POWER SOURCE CONTROL ECU

2.INSPECT FUSE (STOP SW)

  1. Remove the STOP SW fuse from cowl side junction block RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


3.INSPECT STOP LIGHT SWITCH


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction (Cable-Information Does Not Match To Bean-Information)

  1. Remove the switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Switch pin not pushed
    		Below 1 Ω
    3 - 4
    		Switch pin not pushed
    		10 kΩ or higher
    1 - 2
    		Switch pin pushed
    		10 kΩ or higher
    3 - 4
    		Switch pin pushed
    		Below 1 Ω


NG
REPLACE STOP LIGHT SWITCH
OK


4.CHECK WIRE HARNESS (STOP LIGHT SWITCH - POWER SOURCE CONTROL ECU AND BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System. Dtc B2284 Brake Signal Malfunction (Cable-Information Does Not Match To Bean-Information)

  1. Disconnect the A37 switch connector.

  1. Disconnect the L73 ECU connector.

  1. Measure the voltage and resistance of the wire harness side connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A37-2 - Body ground
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Specified Condition
    A37-1 - L73-1 (STP)
    		Below 1 Ω
    A37-1 or L73-1 (STP) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK POWER SOURCE CONTROL ECU

  1. Temporarily replace the power source control ECU with a new or normally functioning one.

  1. Check that the engine starts normally.

    OK:
    Engine starts normally.


NG
GO TO LIGHTING SYSTEM
OK

END (POWER SOURCE CONTROL ECU IS FAULTY)