VEHICLE-MOUNTED RELAY DEVICE, COMPUTER PROGRAM, AND FAILURE DETERMINING METHOD

Provided are a vehicle-mounted relay device, a computer program, and a failure determining method capable of determining the presence of a failure in a vehicle-mounted device. The vehicle-mounted relay device includes: a power relay unit; a sensing unit that senses a power consumption; a communication relay unit that relays transmission and reception of data; and a failure determining unit that determines the presence or absence of a failure. The vehicle-mounted relay device may include a cutoff unit cutting off the power to the vehicle-mounted device from the power relay unit when a failure is determined to be present on the basis of the power consumption amount sensed. The vehicle-mounted relay device may include a limiting unit that limits the relay of data from the vehicle-mounted device to another device when a failure is determined to be present on the basis of the data transmitted being an abnormal value.