Keyless entry system

A keyless entry system for use with an automotive vehicle having an internal combustion engine and a key receptacle, comprising:

• a key for operation within the key receptacle to start the engine, the key including means for transmitting a code signal including a first ID code specified therefor when the key is operated within the key receptacle to start the engine, and means for transmitting the first ID code along with a command for vehicle door lock/unlock remote control;
• a receiver for receiving the code signal transmitted from the key;
• antitheft control means for comparing the first ID code of the received code signal with a second ID code registered therein to permit the engine to start when the received first ID code is identical with the registered second ID code;
• means associated with the receiver for registering a third ID code based on the first ID code of the code signal received by the receiver;
• and
• keyless entry control means for comparing the transmitted first ID code with the third ID code registered therein to permit the remote control specified by the transmitted command when the transmitted first ID code is identical with the registered third ID code.

A keyless entry system for use with an automotive vehicle, comprising:

• an antitheft transmitter to transmit a keyless entry ID code;
• an antitheft receiver disposed in the vehicle to receive the keyless entry ID code transmitted by the antitheft transmitter;
• a keyless entry transmitter to transmit a keyless entry ID code;
• a keyless entry receiver to receive the keyless entry ID code transmitted by the keyless entry transmitter;
• a keyless entry memory disposed in the vehicle;
• and
• a keyless entry controller connected to the antitheft receiver and storing the keyless entry ID code in the keyless entry memory when the antitheft receiver receives the keyless entry ID code, the keyless entry controller locking and unlocking a door of the vehicle when the keyless entry ID code received by the keyless entry receiver is identical to the keyless entry ID code stored in the keyless entry memory.