• Nissan Motor Co., Ltd.
• Mazda Motor Corporation
• Mitsubishi Motors Corporation
• Subaru Corporation
• Suzuki Motor Corporation
• Mitsubishi FUSO Bus Manufacturing Co., Ltd.
• Hitachi Automotive Systems, Ltd.
• JATCO Ltd.
• Aichi Machine Industry Co., Ltd.
• Toyota Motor Corporation
• Honda Motor Co., Ltd.
• Isuzu Motors Limited
• Nissan Shatai Co., Ltd.
• Daihatsu Motor Co., Ltd.
• UD Trucks Corporation
• YAZAKI PARTS CO., LTD.
• TOTO LTD.