Electronic control unit and information management system

An electronic control unit for a vehicle, the electronic control unit containing as storage media (i) a nonvolatile memory in which data rewriting is electrically enabled, and (ii) a volatile memory serving as a backup memory in which data storage is enabled with an electric power always supplied from a battery, the nonvolatile memory storing a vehicle identification code, the backup memory storing failure diagnosis related information that indicates an execution or a non-execution of a failure diagnosis and an execution result of the failure diagnosis,

• the electronic control unit comprising:
• a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
• and
• a history writing section configured to write, in the backup memory, history information when the rewriting section rewrites, the history information indicating an execution of the rewriting of the vehicle identification code.

An electronic control unit for a vehicle, the electronic control unit containing a storage media that stores a vehicle identification code and failure diagnosis related information as well, the failure diagnosis related information indicating (i) an execution or a non-execution of a predetermined failure diagnosis, and (ii) an execution result of the predetermined failure diagnosis,

• the electronic control unit comprising:
• a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
• a history writing section configured to write, in the storage media, history information when the rewriting section rewrites the vehicle identification code, the history information indicating an execution of the rewriting of the vehicle identification code;
• a determination section configured to determine whether the predetermined failure diagnosis corresponding to the failure diagnosis related information stored in the storage media is thoroughly executed after the rewriting section rewrites the vehicle identification code;
• and
• an elimination section configured to eliminate the history information written by the history writing section when the determination section determines that the predetermined failure diagnosis is thoroughly executed.

An information management system for a vehicle, the system comprising:

• at least two electronic control units including a first electronic control unit and at least one second electronic control unit, the at least two electronic control units being communicated via an in-vehicle network within the vehicle,
• the first electronic control unit storing a vehicle identification code, at least the first electronic control unit out of the at least two electronic control units storing failure diagnosis related information indicating an execution or a non-execution of a failure diagnosis and an execution result of the failure diagnosis,
• the first electronic control unit comprising:
• a rewriting section configured to rewrite the vehicle identification code when a rewriting instruction for the vehicle identification code is inputted;
• a history writing section configured to write, in a storage media of one of the at least one second control unit, history information when the rewriting section rewrites, the history information indicating an execution of the rewriting of the vehicle identification code;
• and
• an elimination section configured to eliminate the failure diagnosis related information from a storage media contained in the first electronic control unit when an elimination instruction is inputted from a device outside of the vehicle via the in-vehicle network,
• wherein the one of the at least one second control unit that stores the history information eliminates the history information from the storage media contained in the one of the at least one second electronic control unit when the elimination instruction is inputted via the in-vehicle network.