Airbag jacket activating system

An airbag jacket activating system includes an acceleration sensor, an on-vehicle ECU, and an on-vehicle radio communications instrument which are provided in a vehicle body and an in-jacket radio communications instrument and an in-jacket ECU which are provided in an airbag jacket, the acceleration sensor being configured to detect acceleration applied to the vehicle body, the on-vehicle ECU is configured to output an activation signal for the airbag jacket on a basis of an output signal from the acceleration sensor, the on-vehicle radio communications instrument is configured to transmit the activation signal through radio communications on a basis of the output signal from the on-vehicle ECU, the in-jacket radio communications instrument is configured to receive the activation signal through radio communications, the in-jacket ECU is configured to inflate and thus deploy the airbag jacket on a basis of the activation signal, the airbag jacket activating system comprising:

• a human body communications transmitter, provided on the vehicle body, for transmitting the activation signal by using the human body of a rider as a transmission path on a basis of an instruction from the on-vehicle ECU;
• and
• a human body communications receiver, provided on the airbag jacket, for receiving the activation signal which is transmitted by using the human body of the rider as the transmission path;
• wherein the in-jacket ECU is configured to inflate and thus deploy the airbag jacket upon receipt of the activation signal through communications of the human body communications transmitter or the human body communications receiver.