Abstract: When both a key insertion detecting switch (a push switch in an intelligent key system vehicle) and a buckle switch are off, a room lamp is controlled so as to be extinguished. Even when the key insertion detecting switch is off and the buckle switch is on, the room lamp is controlled so as to be extinguished. When the key insertion detecting switch is off and the buckle switch changes from on to off, the room lamp is lit, and a timer incorporated within a CPU starts counting. When a predetermined time period has elapsed, the room lamp is automatically extinguished.

Abstract: An electronic key device for a vehicle which performs starting of the vehicle by performing ID verification against a portable electronic key unit includes an ID verification device, a decision device, and a vehicle starting control device. When the number of times that the result of ID checking by the ID verification device is negative and also the portable key unit is not present within the vehicle arrives at a predetermined value, a locked mode is set in which thereafter starting of the vehicle is prohibited unless a predetermined procedure is performed. When the result of ID checking by the ID verification device is affirmative and the portable key unit is not present within the vehicle, then no such predetermined number of times calculation for setting the locked mode is performed.

Abstract: When both a key insertion detecting switch (a push switch in an intelligent key system vehicle) and a buckle switch are off, a room lamp is controlled so as to be extinguished. Even when the key insertion detecting switch is off and the buckle switch is on, the room lamp is controlled so as to be extinguished. When the key insertion detecting switch is off and the buckle switch changes from on to off, the room lamp is lit, and a timer incorporated within a CPU starts counting. When a predetermined time period has elapsed, the room lamp is automatically extinguished.

Abstract: An on-vehicle apparatus communicates with an electronic key by wireless communication. The one-vehicle apparatus decides to unlock a vehicular door according to an identification result between first ID of the electronic key and unlock-operation ID of the on-vehicle apparatus, and decides to start an engine of the vehicle according to an identification result between second ID of the electronic key and engine-starting ID of the on-vehicle apparatus. The on-vehicle apparatus commands the electronic key to output third ID shorter in data length than the second ID, when the first ID corresponds with the unlock-operation ID. The on-vehicle apparatus permits starting the engine when the third ID corresponds with compacted data of the engine-starting ID.

Abstract: A vehicular electronic key system includes an on-vehicle apparatus which is communicable with an electronic key when the electronic key is in a predetermined area outside of a vehicle. The on-vehicle apparatus generates alarm when a door lock operation is executed from the outside of the vehicle and when the on-vehicle apparatus is not capable of communicating with the electronic key. Further, on-vehicle apparatus generates alarm when a key ID does not corresponds with an apparatus ID. Therefore, the electronic key system can firmly prevent the electronic key from being mislaid in the vehicle.

Abstract: An electronic key device for a vehicle which performs starting of the vehicle by performing ID verification against a portable electronic key unit includes an ID verification device which performs ID verification against the portable electronic key unit when pushing in operation of an ignition knob has been performed, a decision device which decides whether or not the portable electronic key unit is present within the vehicle when vehicle starting operation has been performed, and a vehicle starting control device which performs starting control of the vehicle, when the ID checking result and also the result of the decision by the decision device are both affirmative. When the number of times that the result of ID checking by the ID verification device is negative and also it is decided that the portable key unit is not present within the vehicle arrives at a predetermined value, a locked mode is set in which thereafter starting of the vehicle is prohibited unless a predetermined procedure is performed.

Abstract: A vehicular electronic key system includes an on-vehicle apparatus which is communicable with an electronic key when the electronic key is in a predetermined area outside of a vehicle. The on-vehicle apparatus generates alarm when a door lock operation is executed from the outside of the vehicle and when the on-vehicle apparatus is not capable of communicating with the electronic key. Further, on-vehicle apparatus generates alarm when a key ID does not corresponds with an apparatus ID. Therefore, the electronic key system can firmly prevent the electronic key from being mislaid in the vehicle.

Abstract: An on-vehicle apparatus communicates with an electronic key by wireless communication. The one-vehicle apparatus decides to unlock a vehicular door according to an identification result between first ID of the electronic key and unlock-operation ID of the on-vehicle apparatus, and decides to start an engine of the vehicle according to an identification result between second ID of the electronic key and engine-starting ID of the on-vehicle apparatus. The on-vehicle apparatus commands the electronic key to output third ID shorter in data length than the second ID, when the first ID corresponds with the unlock-operation ID. The on-vehicle apparatus permits starting the engine when the third ID corresponds with compacted data of the engine-starting ID.

Abstract: A key for a vehicle has a push button, a first transmitter-receiver circuit for transmitting a first ID signal stored in a first memory in response to an ID request signal, and a second transmitter-receiver circuit for transmitting a second ID signal in response to a pressing operation of the push button. An in-car antitheft system has a check circuit for comparing the received first ID signal with a registered ID, and an engine control circuit for inhibiting the operation of an engine if the received ID does not correspond to the registered ID. When the button is pressed for a duration longer than a predetermined length, the second transmitter-receiver circuit of the key transmits the first ID signal in place of the first transmitter-receiver circuit.

Abstract: An anti-theft device memorizes the location of the vehicle when the engine stops, receives a signal peculiar to a vehicle (for example, from a key having a transmitter), and permits starting the engine when the received signal is identical with a predetermined code and the memorized location and the current location where the vehicle exists are within a predetermined range.

Abstract: An anti-theft car protection system comprises a transmitter-receiver for receiving a code of the key, an immobilizer unit for collating said code as received with a code as registered and transmitting an engine start permission signal to an engine control unit when said code as received coincides with said code as registered, and means, cooperating with said immobilizer unit, for removing repetition of key operation upon start of the engine.

Abstract: An antitheft apparatus for an automotive vehicle comprises: a transponder (1) buried in an ignition key to store an ID number thereof; a transmit and receive unit (2) provided in an ignition key cylinder to receive the ID number of the ignition key inserted into the ignition key cylinder; and an immobilizer unit (3) for, in antitheft mode, collating the received ID number with a number of stored ID numbers, and outputting an engine start enable signal when the received ID number matches one of the stored ID numbers and an engine start disable signal when does not match. In particular, the immobilizer unit (3) releases an ID number register mode into the antitheft mode automatically, when the received ID number is read twice successively by the transmit/receive unit or when is the same as one of the already stored ID numbers. On the other hand, after any given number of ID numbers have been registered, the ID number register mode can be also released automatically.