B1212

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1212: Front Passenger Door ECU Communication Stop

DTC B1212 - Front Passenger Door ECU Communication Stop

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DOOR WARNING LIGHT (OPERATION)
(a) Open the front passenger door and check that the door warning light (built into combination meter) lights up.
OK:
Door warning light lights up.
OK -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH
NG -- Continue to next step.
2. CHECK WIRE HARNESS (MULTIPLEX NETWORK FRONT DOOR ECU RH - BATTERY AND BODY GROUND)




(a) Disconnect the P11 ECU connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard voltage:






Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE




(a) Disconnect the G3, P9 and S18 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH AND REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH