Abstract: A disclosed wireless communication device performing transmission and reception in a time-division manner includes an antenna, a transmission unit, a reception unit, a transmission/reception switchover unit, a first path switchover unit, a directional coupler, a second path switchover unit, a first fault diagnosis unit, and a second fault diagnosis unit. The second fault diagnosis unit causes the second path switchover unit to form a reflection signal input path; causes a second transmission signal level-adjusted for fault diagnosis to be outputted from the transmission unit; acquires a signal level of a reflection signal from the antenna inputted from the directional coupler into the reception unit; and determines whether or not a transmission radio wave is normally emitted from the antenna based on the signal level of the reflection signal.

Abstract: A disclosed wireless communication device includes an antenna for communication, a transmission unit, a reception unit, a transmission/reception switchover unit, a communication control unit, a diagnosis start determination unit, a loopback path forming unit, a reception level determination unit, a reception duration determination unit, and a fault assertion unit. When a loopback path, which inputs a transmission signal outputted from the transmission unit into the reception unit, is formed by the loopback path forming unit, the reception level determination unit detects a signal level of a reception signal received by the reception unit, and determines whether or not the signal level is normal. The reception duration determination unit measures a reception duration of the reception signal in the reception unit, and determines whether or not the reception duration has exceeded a threshold value for abnormality determination.