Patent ID: 8194414

Claim:
A sensor device connectable to an electronic control unit (ECU) of an occupant protection system that protects an occupant in a vehicle when the vehicle has a collision comprising: a communication line having a high level line and a low level line; an ungrounded multilayer printed wiring having a plurality of wiring layers and connected to the communication line so as to have a differential communication with the electronic control unit; and an insulation layer interposed between each of the wiring layers in the multilayer printed wiring, wherein the multilayer printed wiring includes a low level conduction pattern connected to the low level line, and a circuit element that operates in accordance with a standard corresponding to the low level line, and a predetermined printed wiring interposed in a space of the multilayer printed wiring through the insulation layer, and the predetermined printed wiring has a high-level conduction pattern connected at only one end to the high level line.