Nissan is selling its stake in the auto parts company Calsonic Kansei as it casts off noncore businesses to focus on electric vehicles and self-driving cars. The automaker is hiving off its 41 percent stake to the U.S. buyout firm KKR, which is buying the Japan-based Calsonic in a deal valued at about $4.5 billion (nearly ¥500 billion), Nissan said Tuesday. KKR is paying ¥1,860 per share for Calsonic, which makes vehicle interiors, climate control systems, compressors, exhaust systems and electronics. That is a 28 percent premium on Calsonic's closing share price Tuesday. Calsonic -- which has about 22,000 employees and ¥1.05 billion in annual sales -- also supplies other automakers, including Renault, Isuzu, Daimler and General Motors.