Japan’s car makers are at a pivotal stage in a pivotal industry as they contemplate collaborating on topics that were once addressed individually. Toyota is leading the way toward a new agenda of cooperation that would see Toyota and the other six major carmakers team up more closely on the development and standardisation of components. Toyota Motor Corp vice Chairman Koji Sato, who is also chairman of the Japan Automobile Manufacturers Association (JAMA), has said Japanese auto makers must establish more spaces for cooperation to boost their international competitiveness. The proposal is based on parts that the customer will never see that are critical to every vehicle.

The concept is quite straightforward: the seven companies would not spend money and engineering time on duplicating the same commodity parts, but instead they would agree on common standards for selected parts. There are some forms of hardware that may be standardized, including wiring harnesses, connectors, fluid hoses, fasteners, steel grades, cooling systems and some commodity plastics. This will eliminate waste along the supply chain and enable automakers to do more with their engineering resources. Then the savings could be channeled into technologies that have a much more visible impact on the future vehicle.

Japanese brands would not be identical if the cooperation were to take place. Toyota, Honda, Nissan, Mazda, Subaru, Mitsubishi, and Suzuki would remain in the realms that could be said to make them unique. Styling, interior, driving qualities, safety technology, software, user experience and even brand positioning would continue to be areas of competition. The idea is to optimize the inner workings of vehicles while giving engineers more time and money to devote to features that customers experience.

1. A Common Standard for Hidden Components

The number of variations of basic auto parts is huge and one of the greatest opportunities. Japan’s suppliers are said to produce more than 70,000 different combinations of wiring harnesses to suit the requirements of various car manufacturers. These parts are not often seen by the driver, but must be engineered, manufactured, stored and coordinated with the supplier.

Standardizing Basic Automotive Components:

• Reduce unnecessary component variations
• Simplify supplier manufacturing processes
• Improve inventory and production efficiency
• Create common hardware foundations

It would be very helpful to have common standards for such elements that would eliminate much of the superfluous complexity. A connector or wiring device that acts in a similar manner in different vehicles does not have to be designed in different slightly variant forms. More uniformity would ease production and allow suppliers to more easily service several automakers with more efficient manufacturing processes.

This would be applicable to other commodity hardware as well. Common fluid hoses, fasteners, cooling parts, steel grades, or plastics could provide a common platform under different brand vehicles. The exterior design and driving feel would be unaffected, while the somewhat less conspicuous hardware could be made more efficient throughout the industry.

2. Cooperation Without Losing Brand Identity 

Where customers don’t differentiate between one carmaker and another is the most critical aspect of the proposal for cooperation. Different manufacturers can make the same wiring harness or the same fastener differently by adding elements of their own to make their product unique. All of the characteristics that make up a brand can be independently designed and created.

Protecting Individual Brand Characteristics:

• Preserve independent engineering philosophies
• Maintain distinctive vehicle technologies
• Separate shared hardware from design
• Keep customer experiences brand-specific

Honda could keep building on its own engineering ethos, Subaru could stick with its boxer-engine legacy and Mazda could keep on the fun of it. Toyota, Nissan, Mitsubishi and Suzuki would also have their own design ideology, tech and experience with their customers. Standardization under the water would merely give it a more efficient technical bedrock.

This partnership or competition is a key aspect of Sato’s vision. He has talked about the importance of establishing strategic “areas of cooperation” to become more efficient and competitive in areas that are important. It is not to eliminate competition in Japan’s motor industry but to render it more sustainable.

3. Rising Pressure From Global Rivals 

The push for greater efficiency is taking place as the Japanese carmakers are getting tougher competition from overseas manufacturers. Product innovation is also a key strength of Chinese companies such as BYD, SAIC Motor, Leapmotor, Chery Automobile, and Geely Group, which have made tremendous strides in international expansion while offering competitive prices and developing products faster and more sophisticated.

Growing Competition From Chinese Automakers:

• Chinese brands expand international presence
• Competitive pricing increases market pressure
• Faster development challenges established manufacturers
• Software integration raises customer expectations

The Japanese brands have been under special pressure in China, where local brands have rushed into electric vehicles as well as software-based mobility services. In China, Toyota sales declined 17 percent compared to the same time last year, and Honda sales declined 35 percent. The numbers show the dramatic fluctuations of market conditions for existing manufacturers.

The competition is also evident in Europe. In May and June of 2026, five Chinese automakers are expected to be responsible for over 138,000 sales, compared with 130,424 cars sold in the region by the Japanese brands during the same time. The need to cut down on unnecessary expenses has become more significant, too, as Japanese manufacturers are similarly facing broad industry sales issues.

4. China’s Market Challenges

The Japanese automakers are rethinking their traditional business models for the first time with the case of China. Electric vehicles have been developed rapidly by local manufacturers, who have also been able to adapt to the changing expectations of consumers, with reduced development time. Traditionally, Japanese firms have been known for manufacturing quality and continuous improvement over the years, and they are now being forced to get faster.

Pressure From China’s EV Market:

• Faster electric vehicle development cycles
• Rapidly changing consumer expectations
• Rising costs of EV development
• Greater need for manufacturing efficiency

The crisis has been worsened by Honda’s financial woes. The balance sheet showed a net loss of around ¥423.9 billion ($2.6 billion) in the fiscal year that ended in March. In part, the loss was attributed to writedowns relating to efforts to develop the EV, and marked Honda’s first annual loss since being listed in 1957.

Consolidating the basic components may help to lower the basic manufacturing costs and save resources for the companies to invest in electric vehicles, software, batteries, and other technologies. If a manufacturer are looking to save a few cents on thousands of components, it can add up when applied to the millions of components they make globally.

5. Lessons From Japan’s Automotive History 

Japan’s history shows that it has done just that, transforming industrial problems into opportunities, through cooperation, investment and industrial reform. In the 1950s it was often said that Japanese cars and manufactured items were not trusted abroad. In subsequent decades, however, significant advances in manufacturing processes and technologies converted Japan into one of the world’s most esteemed centers of manufacturing for the auto industry.

Historical Lessons From Industrial Cooperation:

• Manufacturing reforms improved global competitiveness
• Cooperation supported long-term industrial growth
• Partnerships existed beneath brand competition
• Shared components enabled broader collaboration

Japanese manufacturers made significant advances in their capabilities during the 1960s and 1970s as a result of industrial reforms and corporate development. From building comparatively small cars to engineering internationally renowned models, the country progressed from its relative modesty to its own standards. This change paved the way for the worldwide reputation for Japanese automakers that it has maintained to this day.

Past collaborations also demonstrate that it is not always a zero-sum game with competition. Nissan’s association with Prince Motor Company gave an influence to the Skyline reputation and Toyota’s links with other manufacturers have given a boost to projects in various vehicle markets. Even the toughest motorsport competitors have collaborated with co-supplying parts, proving that a degree of collaboration can prevail beneath the most extreme brand rivalry.

6. A Strategy Proposed Years Prior

It’s not the first time that someone has proposed sharing something in the automotive industry. In his presentation “Confessions of a Capital Junkie” in 2015, former Fiat Chrysler Automobiles CEO Sergio Marchionne spoke about a similar concept. According to Marchionne, carmakers are spending huge sums of money on R&D on parts that customers never see.

Earlier Calls For Component Sharing:

• Reduce duplicated research and development
• Share basic automotive technologies
• Preserve competition in visible features
• Lower unnecessary development expenses

His offer involved more cooperation on such matters as seat frames, wiring systems, HVAC equipment and electric motors. The firms could license the fundamental technology to each other, but still race on their design, performance, and user experience. The principle is very similar to that being followed by the Japanese motor industry.

Sato’s suggestion therefore is a new take on a well-established industrial concept. The difference, however, is the sense of urgency that is driving the change in automobiles today. The development of EV, software, batteries, autonomous driving and artificial intelligence is gigantic and every manufacturer has to do a lot of work for each supporting component, which makes it more difficult than ever before.

7. Benefits for Smaller Japanese Automakers 

Cooperation might be particularly beneficial for manufacturers with lower production volume. Mazda, Subaru, Mitsubishi and Suzuki have solid brands and distinct products, but not necessarily a global reach as big as Toyota or other major automotive corporations.

Supporting Smaller Automotive Manufacturers:

• Improve economies of scale
• Reduce per-unit component costs
• Simplify supplier relationships
• Free smaller engineering teams

Commonly using component standards would enable smaller manufacturers to benefit from economies of scale that they would otherwise lack. Buying parts together in bulk may achieve both lower per-unit prices and fewer suppliers. There would also be less time for smaller engineering teams to maintain several versions of basic hardware.

The savings may be used down the road for product development. Mazda may be able to focus more energy into sports-car and performance programs; Subaru could invest more into future performance and electrification programs. The bigger picture is to make smaller manufacturers more resilient without compelling them to lose aspects that make them unique.

9. Toyota’s Experience With Shared Platforms 

Toyota already has a lot of experience of applying the common technical base in various vehicles. It is built on Toyota’s Toyota New Global Architecture, or TNGA, which enables structural and engineering elements to be shared between a number of Toyota and Lexus models while keeping the designs and features of each unique.

Existing Examples of Technical Cooperation:

• Shares platforms across vehicle programs
• Supports joint development with competitors
• Extends cooperation into electric vehicles
• Builds on existing supplier relationships

It’s also a sign of how well it might work between top competitors. Toyota and Subaru created the GR86 and the BRZ together, while Toyota and BMW have worked together to create the Supra and Z4. Toyota’s research and development efforts have also included electric SUVs such as the bZ4X and Solterra made in collaboration with Subaru. Japanese manufacturers have already established partnerships beyond traditional competition limits for powertrain projects. As examples, these ideas offer a practical basis for further cooperation in standardized commodity components.

9. A Wider Industrial Cooperation Strategy 

The trend of better cooperation is not limited to carmakers. The leaders of the automotive, logistics, power and travel industries have gathered for discussions at the Committee on Mobility of the Keidanren to consider the competitiveness of the country’s future. In the larger discussions, it is becoming accepted that developing mobility cannot just be the responsibility of the vehicle manufacturer.

Building A Broader Mobility Ecosystem:

• Connect multiple mobility-related industries
• Encourage cross-industry strategic cooperation
• Support Japan’s future competitiveness
• Develop broader mobility technology ecosystems

Toyota Chairman Akio Toyoda has said that he wants to transcend the limits of the industry and cooperate to shape the future. In addition, the discussions that take place with Japan’s Ministry of Economy, Trade and Industry have also been dedicated to the industrial situation at home and abroad, and the Japan Mobility Show offers an ideal opportunity to showcase Japanese mobility technology to world audiences.

Dr. Gill Pratt, Toyota’s Chief Scientist, has also been involved in the discussions about Japan’s multi-pathway carbon neutrality. Japan is trying to develop a wider ecosystem around future mobility, not just as a vehicle development project, by creating a closer link between automakers and energy companies, and between automakers and technology providers.

10. Redirecting Investment Toward Future Mobility

The best case for standardization of components is the opportunity to re-allocate resources both engineering manpower and funding towards technology that will shape the next generation of vehicles. Eliminating redundant work in battery components, autonomous driving, software-defined vehicles, artificial intelligence, and advanced electronic systems and on commodity parts such as wiring, hosing and structural plastics could free up resources for battery development.

Redirecting Resources Toward Innovation:

• Increase investment in future technologies
• Reduce duplicate engineering efforts
• Support faster automotive development
• Preserve long-term industry competitiveness

This trend is significant given that the competition continues to race in reducing the development cycle. The automotive sector has seen a number of companies, such as Tesla and Chinese EV producers, revolutionize their production lines with simplified manufacturing processes, electronic integration and novel manufacturing techniques, all of which have helped to reduce costs and accelerate development. It is imperative for the Japanese automakers to increase efficiency without compromising their world-class engineering, since that’s what made them famous.

Sato’s voice is heard loud enough that suppliers are in no doubt the situation is urgent and the industry needs to change if it is to survive the current transition. This is not just a matter of the automotive industry’s pressure, it is reflected in his message. Standardized commodity components could provide Japanese manufacturers more leeway to invest in the technologies used by customers directly.