Electronic devices used in automobiles have seen a sharp increase in demand every year, but in order to keep abreast of the growing market demand certain problems exist which are considered. It is important to improve the reliability of the electronic parts used in these devices. To attain this objective, it is necessary to establish a system of close cooperation between the automobile industry and the electronics industry, and to produce and select parts of high reliability for use in automotive electronic devices. It is argued that in order to produce ″100% reliable″ products, it is imperative to upgrade the screening technology and to perform sufficient reliability tests as well as to improve electromagnetic compatibility (EMC) for digital electronic products.