Abstract: A method for registering a first electronic key, which is capable of controlling a communication subject, to a controller of the communication subject, the method including: performing an initial production process including storing identification information unique to the communication subject in the controller, and storing an encryption key generation code unique to the first electronic key and an encryption key that is used to verify the first electronic key in the first electronic key; and performing an initial registration process including writing the identification information stored in the controller to the first electronic key, obtaining the encryption key generation code from the first electronic key, generating the encryption key with an encryption key generation logic that uses the encryption key generation code, storing the encryption key in the controller, and storing encryption key information related to the encryption key in a database in association with the identification information.

Abstract: An immobilizer ECU generates an encryption key using key generating logic, from a SEED code included in an ID code signal sent from an electronic key, and registers the encryption key to the immobilizer ECU. The immobilizer ECU receives an instruction from a registration and deletion tool and sends, to the electronic key, a deletion request signal that requests the deletion of the SEED code. The electronic key deletes the SEED code from the electronic key if a deletion request signal has been received.

Abstract: A method for registering first and second electronic keys, which are capable of controlling a communication subject, to a controller of the communication subject, wherein the first electronic key is to be initially registered, and the second electronic key is to be additionally registered, the method including: performing an additional key production process including storing, in the second electronic key, an additional encryption key generation code unique to the second electronic key and an additional encryption key that is used to verify the second electronic key; and performing a key additional registration process including obtaining the additional encryption key generation code from the second electronic key when identification information unique to the communication subject is stored in the second electronic key, generating the additional encryption key with an additional encryption key generation logic, and storing the additional encryption key in the controller.

Abstract: A wireless communications system that regularly executes verification between an electronic key and an immobilizer ECU, and sends and receives deletion request signals unrelated to verification, between the electronic key and the immobilizer ECU. The sending and receiving of deletion request signals is executed at intervals between the regularly executed verifications.

Abstract: An electronic key registration system includes a controller of a communication subject, an initial electronic key that communicates with the communication subject and has an initial encryption key generation code, an additional electronic key that communicates with the communication subject, and an information center including an additional encryption key. The initial electronic key holds an initial encryption key generated from the initial encryption key generation code and a logic. The controller holds the logic and identification information of the communication subject. The controller acquires the initial encryption key generation code from the initial electronic key, generates an initial encryption key from the initial encryption key generation code and the logic held by the controller, and stores the initial encryption key. The information center sends the additional encryption key to the additional electronic key or the controller through a network.

Abstract: An offline immobilizer ECU reads an encryption key generation code from an offline additional electronic key and generates an electronic key encryption key for the offline additional electronic key using the encryption key generation code and a communication subject key encryption key held by the immobilizer ECU. The immobilizer ECU stores, in a memory, the generated electronic key encryption key and a key ID code that is read from the offline additional electronic key.

Abstract: An immobilizer ECU transmits a vehicle ID code and a SEED code, which is read from an electronic key, to a data center online. The data center generates an encryption key from the received SEED code and a first logic, and generates a further SEED code from the encryption key, the vehicle ID code, and a second logic. The immobilizer ECU obtains the further SEED code online from the data center, generates the encryption key from the obtained further SEED code, the vehicle ID code, and the second logic, and stores the encryption key.

Abstract: An electronic key registration system includes a controller arranged in a communication subject communicable with an electronic key. A registration tool is in wired or wireless connection with the communication subject. The registration tool registers the electronic key to the controller when receiving a registration permission signal. An information center is connected to a network. The registration tool includes an operator ID acquisition unit that acquires an operator ID from a key registration operator. A communication unit sends the operator ID to the information center through the network. The information center includes an operator ID verification unit that verifies the operator ID received from the registration tool. A permission information notification unit sends, when the operator ID is verified, a registration permission signal to the registration tool through the network to permit the registration tool to perform the registration process.

Abstract: A method for registering first and second electronic keys, which are capable of controlling a communication subject, to a controller of the communication subject, wherein the first electronic key is to be initially registered, and the second electronic key is to be additionally registered, the method including: performing an additional key production process including storing, in the second electronic key, an additional encryption key generation code unique to the second electronic key and an additional encryption key that is used to verify the second electronic key; and performing a key additional registration process including obtaining the additional encryption key generation code from the second electronic key when identification information unique to the communication subject is stored in the second electronic key, generating the additional encryption key with an additional encryption key generation logic, and storing the additional encryption key in the controller.

Abstract: An immobilizer ECU generates an encryption key using key generating logic, from a SEED code included in an ID code signal sent from an electronic key, and registers the encryption key to the immobilizer ECU. The immobilizer ECU receives an instruction from a registration and deletion tool and sends, to the electronic key, a deletion request signal that requests the deletion of the SEED code. The electronic key deletes the SEED code from the electronic key if a deletion request signal has been received.

Abstract: A wireless communications system that regularly executes verification between an electronic key and an immobilizer ECU, and sends and receives deletion request signals unrelated to verification, between the electronic key and the immobilizer ECU. The sending and receiving of deletion request signals is executed at intervals between the regularly executed verifications.

Abstract: A method for registering a first electronic key, which is capable of controlling a communication subject, to a controller of the communication subject, the method including: performing an initial production process including storing identification information unique to the communication subject in the controller, and storing an encryption key generation code unique to the first electronic key and an encryption key that is used to verify the first electronic key in the first electronic key; and performing an initial registration process including writing the identification information stored in the controller to the first electronic key, obtaining the encryption key generation code from the first electronic key, generating the encryption key with an encryption key generation logic that uses the encryption key generation code, storing the encryption key in the controller, and storing encryption key information related to the encryption key in a database in association with the identification information.

Abstract: An immobilizer ECU transmits a vehicle ID code and a SEED code, which is read from an electronic key, to a data center online. The data center generates an encryption key from the received SEED code and a first logic, and generates a further SEED code from the encryption key, the vehicle ID code, and a second logic. The immobilizer ECU obtains the further SEED code online from the data center, generates the encryption key from the obtained further SEED code, the vehicle ID code, and the second logic, and stores the encryption key.

Abstract: An offline immobilizer ECU reads an encryption key generation code from an offline additional electronic key and generates an electronic key encryption key for the offline additional electronic key using the encryption key generation code and a communication subject key encryption key held by the immobilizer ECU. The immobilizer ECU stores, in a memory, the generated electronic key encryption key and a key ID code that is read from the offline additional electronic key.

Abstract: An electronic key registration system includes a controller of a communication subject, an initial electronic key that communicates with the communication subject and has an initial encryption key generation code, an additional electronic key that communicates with the communication subject, and an information center including an additional encryption key. The initial electronic key holds an initial encryption key generated from the initial encryption key generation code and a logic. The controller holds the logic and identification information of the communication subject. The controller acquires the initial encryption key generation code from the initial electronic key, generates an initial encryption key from the initial encryption key generation code and the logic held by the controller, and stores the initial encryption key. The information center sends the additional encryption key to the additional electronic key or the controller through a network.

Abstract: An electronic key registration system includes a controller arranged in a communication subject communicable with an electronic key. A registration tool is in wired or wireless connection with the communication subject. The registration tool registers the electronic key to the controller when receiving a registration permission signal. An information center is connected to a network. The registration tool includes an operator ID acquisition unit that acquires an operator ID from a key registration operator. A communication unit sends the operator ID to the information center through the network. The information center includes an operator ID verification unit that verifies the operator ID received from the registration tool. A permission information notification unit sends, when the operator ID is verified, a registration permission signal to the registration tool through the network to permit the registration tool to perform the registration process.

Abstract: An electric steering lock capable of outputting a signal correctly indicating an operation state of a steering lock mechanism even when the operation voltage of a lock detector decreases. The electric steering lock includes a CPU, a signal hold circuit, and an OR circuit. When the steering lock mechanism unlocks a steering wheel, an unlock sensor provides an H level detection signal to the CPU and the signal hold circuit. In response to the detection signal, the CPU issues a state hold command to the signal hold circuit. In response to the state hold command, the signal hold circuit generates an H level hold signal in correspondence with the detection signal. The OR circuit provides an H level signal to an immobilizer ECU when at least one of the detection signal from the unlock sensor or the hold signal has an H level.

Abstract: An electric cutoff circuit for preventing overheating of a load. The current shutoff circuit includes an FET connected to a motor circuit. A relay fault detection circuit is connected to the motor circuit to detect potential at the motor circuit. A CPU sends a control signal to a relay. The CPU determines whether a fault has occurred in the relay based on the control signal sent to the relay and the detection of the relay fault detection circuit. When determining that a fault has occurred in the relay, the CPU opens the FET to configure an open circuit with the motor circuit.

Abstract: A steering wheel lock apparatus having high reliability. The steering wheel lock apparatus (1) includes a lock pin (21), which engages a steering wheel (5), a motor (23), which moves the lock pin, and a control circuit (31), which controls the motor. The control circuit includes a power supply line (72b), which provides locking current to the motor for locking the steering wheel. A breaker circuit (61) selectively breaks the power supply line when a user operates an ignition switch knob (81) to start the vehicle.

Abstract: An electric steering lock capable of outputting a signal correctly indicating an operation state of a steering lock mechanism even when the operation voltage of a lock detector decreases. The electric steering lock includes a CPU, a signal hold circuit, and an OR circuit. When the steering lock mechanism unlocks a steering wheel, an unlock sensor provides an H level detection signal to the CPU and the signal hold circuit. In response to the detection signal, the CPU issues a state hold command to the signal hold circuit. In response to the state hold command, the signal hold circuit generates an H level hold signal in correspondence with the detection signal. The OR circuit provides an H level signal to an immobilizer ECU when at least one of the detection signal from the unlock sensor or the hold signal has an H level.