METHOD OF CONTROLLING ON-VEHICLE DEVICE BY USING KEY SYSTEM AND KEY SYSTEM

To improve security of a key system that executes operation of an on-vehicle device.SOLUTION: A method of controlling an on-vehicle device by using a key system 100 is provided in which the key system determines in accordance with an authentication processing result of an ID code wirelessly transmitted from an electronic key 110 whether to permit the operation of the on-vehicle device, including releasing and locking of a door lock and determines in accordance with an authentication processing result of an ID code wirelessly transmitted from a portable terminal 200 including a key function whether to permit the operation of the on-vehicle device. The portable terminal authentication processing includes a second authentication processing in which when a first authentication processing performed by an on-vehicle electronic key 130 is established, the authentication of the ID code wirelessly transmitted from the portable terminal is transmitted from the on-vehicle electronic key to an electronic key authentication ECU 120 and the authentication of the ID code transmitted from the on-vehicle electronic key is performed by the electronic key authentication ECU 120. In accordance with a result of the first authentication processing and an opened state or a locked state of the door, whether to permit the starting of a running drive source is determined by the on-vehicle electronic key.SELECTED DRAWING: Figure 1 【課題】車載機器の作動を実行するキーシステムのセキュリティ性を向上させる。【解決手段】電子キー１１０から無線送信されたＩＤコードの認証処理の結果に応じて、ドアロックの開錠および施錠を含む車載機器の作動の許否を判定すると共に、キー機能を有する携帯端末２００から無線送信されたＩＤコードの認証処理の結果に応じて、車載機器の作動の許否を判定するキーシステム１００を用いた車載機器の制御方法であって、携帯端末認証処理は、携帯端末から無線送信されたＩＤコードの認証を、車載電子キー１３０で行う第１の認証処理が成立した場合に、車載電子キーから電子キー認証ＥＣＵ１２０にＩＤコードを送信し、車載電子キーから送信されたＩＤコードの認証を、電子キー認証ＥＣＵ１２０で行う第２の認証処理とを備え、第１の認証処理の結果及びドアの開錠または施錠の状態に応じて、車載電子キーにより走行駆動源の始動許否を判断する。【選択図】図１