| 摘要 |
During traveling a vehicle, an on-vehicle unit control circuit 22 transmits regularly a mobile unit verification encryption code stored in a storage part 23 of an on-vehicle unit 2 to a mobile unit 1; a transmission circuit 10 of the mobile unit 1 replies a response signal to the on-vehicle unit 2 every time the verification code is received; and the control circuit 22 of the on-vehicle unit 2 updates and stores vehicle environmental information in the storage part 23 upon receiving the response signal, and if the on-vehicle unit 2 cannot receive any response signal from the mobile unit 1, a driver is notified with display lamp 53, hazard lamp 54, or alarm buzzer 55 that the response signal has not been received.
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