B1211

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1211: Driver Door ECU Communication Stop

DTC B1211 - Driver Door ECU Communication Stop

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION
(a) Open the driver door and check that the door warning light (built into the combination meter) illuminates.
OK:
Door warning light illuminates.
OK -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH (DRIVER DOOR ECU)
NG -- Continue to next step.
2.
CHECK WIRE HARNESS (DRIVER DOOR ECU - BATTERY AND BODY GROUND)




(a) Disconnect the M9 ECU connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard voltage:





Standard resistance





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




(a) Disconnect the M9 and O7 ECU connectors.
(b) Disconnect the Q13 switch connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH AND WIRE HARNESS OR CONNECTOR
A -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH (DRIVER DOOR ECU)