STEERING CONTROL DEVICE FOR VEHICLE

摘要

When communication via a main data bus between a certain control unit in a system and another control unit in the system has been diagnosed as "faulty", the presence of the control unit with the main-data-bus communication diagnosis result of "faulty" is shared via the main data bus with another control unit with a main-data-bus communication diagnosis result of "OK", and operating states of all the control units in the system are switched in a coordinated manner. A control unit operating state switching request is transmitted via a sub data bus from the control unit with the main-data-bus communication diagnosis result of "OK" in the system to the control unit with the main-data-bus communication diagnosis result of "faulty", and the control unit with the main-data-bus communication diagnosis result of "faulty" switches the operating state thereof in response to the request so as to operate in concert with the control unit with the main-data-bus communication diagnosis result of "OK".