A number of events commemorating Sakichi Toyoda took place in 1935. First, a bust of Sakichi was installed and an unveiling ceremony held in the Nagoya headquarters of Toyoda Boshoku Corporation in April, and that May, the completion of the Model A1 passenger car prototype was announced in front of Sakichi's tomb and a pledge was made to achieve success in the automotive industry. In addition, the Five Main Principles of Toyoda were adopted on October 30, the fifth anniversary of Sakichi's death.

In conjunction with the development of the automotive business, many new employees were joining the company and it became necessary to confirm at all possible opportunities Sakichi's ideas that had been handed down to Toyota-related companies. For example, President Risaburo Toyoda (Toyoda Boshoku's managing director) said at the unveiling of the bust of Sakichi, "We are unified in our purpose to never forget your spirit of contributing to the company and to the overall good, and we strive to never eschew these responsibilities."

These principles of Sakichi's were organized into concepts for research and discovery as well as business management and standards of conduct for individuals and were adopted as the Five Main Principles of Toyoda, guidelines for all employees of Toyota companies. The Five Main Principles of Toyoda were announced in front of the bust of Sakichi in the Toyoda Boshoku head office.

The announcement of the Five Main Principles of Toyoda at the end of October 1935 came just a month before the announcement of the Model G1 truck and can be seen as an indicator of readiness to enter the automotive business. It indicates the "contributing to the company and to the overall good" objectives of contributing to the development of society and the economy through the establishment of an automotive industry and expresses the commitment to technological development as well as research and creativity for the further advancement of automobiles.