Dtc B1211 Driver Door Ecu Communication Stop

Communication System. Lexus Gs430, Gs300. Uzs190 Grs190
Multiplex Communication. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OPERATION

CHECK WIRE HARNESS (MULTIPLEX NETWORK DOOR ECU FRONT LH (DOOR ECU LH) - BATTERY AND BODY GROUND)

CHECK RESISTANCE OF COMMUNICATION LINE

DTC B1211 Driver Door ECU Communication Stop


DESCRIPTION

  1. This DTC is detected when communication between the multiplex network door ECU front LH (front door ECU LH) and the network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1211
Multiplex network door ECU front LH communication stops
  1. Multiplex network door ECU front LH (front door ECU LH)
  1. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1211 Driver Door Ecu Communication Stop


INSPECTION PROCEDURE

1.CHECK OPERATION

  1. Open the driver door and check that the door warning light (built into the combination meter) illuminates.

    OK:
    Door warning light illuminates.


NG
Go to step 2
OK

REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH (FRONT DOOR ECU LH)

2.CHECK WIRE HARNESS (MULTIPLEX NETWORK DOOR ECU FRONT LH (DOOR ECU LH) - BATTERY AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1211 Driver Door Ecu Communication Stop

  1. Disconnect the O3 ECU connector.

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    O3-4 (CPUB) - Body ground
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Specified Condition
    O3-1 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1211 Driver Door Ecu Communication Stop

  1. Disconnect the O3 and Q2 ECU connectors.

  1. Disconnect the S5 switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    O3-8 (MPX1) - Q2-8 (MPX1)
    		Below 1 Ω
    O3-9 (MPX2) - S5-8 (MPX2)
    		Below 1 Ω
    Result:
    Result
    		Proceed to
    Both are OK
    		A
    One is OK
    		B
    Both are NG
    		C


B
REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH AND HARNESS AND CONNECTOR

C
REPAIR OR REPLACE HARNESS AND CONNECTOR
A

REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH (FRONT DOOR ECU LH)