Dtc B1212 Front Passenger Door Ecu Communication Stop

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK RESISTANCE OF COMMUNICATION LINE

DTC B1212 Front Passenger Door ECU Communication Stop


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
B1212
Multiplex network door ECU front RH communication stops
  1. Multiplex network door ECU front RH (Front door ECU RH)
  1. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1212 Front Passenger Door Ecu Communication Stop


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT DOOR ECU RH) - BATTERY AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1212 Front Passenger Door Ecu Communication Stop

  1. Disconnect the N4 ECU connector.

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    N4-4 (CPUB) - Body ground
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Specified Condition
    N4-1 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


2.CHECK RESISTANCE OF COMMUNICATION LINE

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1212 Front Passenger Door Ecu Communication Stop

  1. Disconnect the N4, P3, V28 and R6 ECU connectors.

  1. Disconnect the c7 switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    N4-7 (MPX3) - R6-4 (MPX1)
    		Below 1 Ω
    N4-8 (MPX1) - c7-1 (MPX1)
    		Below 1 Ω
    N4-9 (MPX2) - P3-8 (MPX1)
    		Below 1 Ω
    N4-8 (MPX1) - V28-27 (MPX1)
    		Below 1 Ω
    Result:
    Result
    		Proceed to
    All are OK
    		A
    One or two is / are OK
    		B
    All are NG
    		C


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

C
REPAIR OR REPLACE HARNESS AND CONNECTOR
A

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