After the WWII, The production of Military industry and heavy industry were prohibited by GHQ. 8/12/1945, GHQ parmited. Many subsistence commodities were lost by war. Military industries changed into peacetime industries to continue own business. The production of automobile was prohibited. Toyota Motor started production of farming implements, cooking tools, and radio.

The Kariya south factory produced electric parts for automobile. Toyota tried to develop auto radio in early 1940's. Toyota radio was manufactured in this factory. At 10/1949, The production of automobile was permitted completely by GHQ. Toyota Motor continued production of radio until 1951. Toyota withdrew from production of radio by reconstruction of automobile industry. This factory became independent of Toyota Motor Co., Ltd. This factory became Denso Ltd.