To provide a vehicle diagnosis system for rationally transmitting vehicle information necessary for diagnosing the abnormality of a control system in a vehicle.
This vehicle diagnosis system 1 is provided with: an in-vehicle device loaded on a vehicle 2 in which a supply power from a battery is used as a part or whole part of a power source; and a center device 5 installed at the management side of the vehicle 2. The in-vehicle device generates vehicle information 7 necessary for diagnosing the abnormality of a control system in the vehicle 2, and the center device 5 analyzes the vehicle information 7, and when detecting the abnormality of the control system of the vehicle 2, transmits warning information for notifying a driver of the result to the in-vehicle device. This vehicle diagnosis system 1 configured as mentioned above is also provided with a power supply control device 3 for supplying power to the battery of the vehicle 2 via a power line 6, and the in-vehicle device transmits the vehicle information 7 via the power supply control device 3 to the center device 5, and uses the power line 6 for communication in the pertinent transmission.
TAKAI YOSHINORI
KOBAYASHI MASAYUKI
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