DTC    B1212    Front Passenger Door ECU Communication Stop

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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


B111299E02


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT DOOR ECU RH) - BATTERY AND BODY GROUND)
B109184E05

  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

E109747E03

  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)