Sumitomo Wiring Systems, Ltd. (SWS) is a Japanese automotive wiring harness manufacturer and a core member of Sumitomo Electric's automotive operations. Headquartered in Yokkaichi, Mie, SWS designs and manufactures complete wiring harness systems, junction blocks, relay boxes, and connectors for global OEMs. SWS employs approximately 80,000 people across plants in Japan, North Africa, Eastern Europe, Southeast Asia, and North America. SWS is among the world's top three automotive wiring harness manufacturers. Key customers include Toyota, Honda, Nissan, and GM.
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