An air bag device for pedestrian includes an inflator which discharges an inflating gas, in operation, and an air bag which is inflated with the inflating gas supplied from the inflator thereby to cover a front face of the front pillar. The base unit has a programmable controller and a color touch screen for user interface with the controller and the modules. When non-cooperative transmissions are detected by the network, the detector assesses the availability of a backup channel enabling migration of the network. The administrative program optionally updates the other partial areas by compulsion, during write access approaches by a tool. In response to the user input, the computer system can convert the for-your-information event to a regular event.