An automobile door structure of this invention is formed by joining an outer panel and inner panel to each other. An interleaver circuit coupled to receive the output data sequence and produce an interleaved data sequence. The controller includes an input, and the actuator is capable of controlling a viscosity of a fluid by delivering a gelling agent to the fluid. When the change rate is less than the given threshold, a plurality of data of the charge current sampled and held during a predetermined period of time are acquired. The system receives period updates regarding the repair of the product, and makes the updates available to the system users in the form of accessible documents.