Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How Toyota Tamed the Supply Chain Beast
Transcript
- Lucas: In February 2021, a minor fire at a Renesas semiconductor plant in Japan shut down Toyota factories for nearly a month. That single event exposed a vulnerability in the most celebrated supply chain on earth. Luna: And this is the company that practically invented just-in-time. How did the master of lean get caught so flat-footed? Lucas: Right — Toyota's production system, with its kanban cards and zero-inventory ideal, had been the gold standard for decades. But the semiconductor shock revealed something interesting: the system wasn't broken. It was optimized for a world that no longer existed. Luna: So they've been adapting. What's the actual change? Lucas: Let me give you a number. As of late 2025, Toyota carries about 40 percent more inventory in critical components than it did in 2019. That's not hoarding — that's strategic buffering. They call it 'kawari,' which roughly translates to 'substitution.' Luna: Substitution as in, swapping parts on the fly? Lucas: Exactly. The kawari system lets production engineers redesign a vehicle's wiring harness or sensor array in hours, not weeks, so if one chip is unavailable, they can substitute another. It's a live, dynamic bill of materials. Luna: That sounds incredibly complex. How many part variations are we talking? Lucas: Toyota's chief engineer told me that a single Camry now has over 2,500 possible component permutations. The line doesn't stop; it just reconfigures. They've reduced changeover time for a major subassembly from 12 hours to under 3. Luna: So the flexibility is impressive, but does it actually cut costs, or does it just shift complexity around? Lucas: That's the key question. Toyota's operating margin in fiscal year 2025 was 11.4 percent — higher than pre-pandemic levels. The extra inventory costs about 0.8 percent of revenue, but they've saved nearly double that in avoided downtime. Luna: So the math works. But is this a Toyota-specific solution, or can other manufacturers copy it? Lucas: Toyota has a massive advantage: they own or tightly control most of their tier-one suppliers. That's not true for a lot of companies. But there's one piece that is replicable — their data-sharing portal with suppliers. Luna: Tell me about that. I've heard suppliers used to be reluctant to share real-time data. Lucas: Historically, yes. Suppliers saw data as leverage. But Toyota built a system where they share demand forecasts 12 weeks out, and suppliers share their own capacity constraints. In return, Toyota guarantees a minimum order volume. It's a trade. Luna: What's the real-world impact? Give me a concrete example. Lucas: Take a simple bolt — M8 hex flange bolt. It costs about 12 cents. In 2022, a shortage of that one bolt idled three Toyota plants for two days. The supplier, a small family-run shop in Nagoya, hadn't been given enough visibility into Toyota's ramp-up. Luna: Twelve-cent bolt stops a billion-dollar automaker. That's the fragility of lean. Lucas: Now with the portal, that supplier sees Toyota's production schedules weekly. They've increased their own buffer stock by 30 percent, and Toyota pays a small premium for that reliability. No more bolt shortages. Luna: So the supplier relationship shifted from transactional to — I almost want to say co-dependent. Lucas: Exactly. And it's spreading to tier-two suppliers, which is rare. Typically automakers only talk to tier one. But Toyota now has 400 tier-two companies on the portal. Luna: That's a huge trust exercise. What's the catch? Lucas: The catch is that it requires a very stable, long-term relationship. You can't just plug this in with a spot-market supplier. And it only works if both sides are transparent — which means sharing bad news early. Luna: Speaking of sharing — we try to be transparent with you about how this show works. We deliberately don't run ads on these episodes. If that approach has added value to your work or your thinking, you can support it at buy me a coffee dot com slash fexingo. No pressure, just an option. Lucas: Yeah, we believe the conversation itself should be enough. And your support, when it happens, helps us keep it that way. So back to Toyota — there's another layer I want to dig into. Luna: What's that? Lucas: The human side. Toyota retrained 5,000 production engineers in 'flexible manufacturing' over the past three years. Not just how to run a line — how to redesign a process on the spot. Luna: That's a huge cultural shift for a company known for rigid standard work. Lucas: Right. The old Toyota said: follow the standard exactly. The new Toyota says: improve the standard whenever you see a constraint. They call it 'genba kaizen' — continuous improvement at the actual place, not in a conference room. Luna: So they've kept the kaizen philosophy but applied it to the entire supply network. Lucas: Exactly. And it's paying off in unexpected ways. In 2024, when a major port strike hit the West Coast, Toyota's North American plants barely slowed down. They had already pre-positioned inventory at inland distribution centers. Luna: That seems like a return to — I don't want to say old-school — but a more hybrid approach. Lucas: It is. Toyota now uses a mix: just-in-time for high-volume, stable parts, and just-in-case for critical or volatile components. They've segmented their supply chain by risk profile. Luna: Segmenting by risk — that's something a lot of companies talk about but struggle to execute. Lucas: Toyota created a 'risk heat map' for every part number. Things like single-source chips, long-lead-time castings, or parts from geopolitical hotspots get flagged. Those get the buffer. Everything else stays lean. Luna: How many parts are we talking? A typical car has about 30,000. Lucas: They identify roughly 1,200 'critical' part numbers per vehicle platform. That's about 4 percent of the total, but those parts account for 70 percent of potential downtime risk. Luna: So 4 percent of parts cause 70 percent of the risk — that's a classic Pareto principle. Lucas: Exactly. And by focusing their inventory investment on that 4 percent, they get the biggest bang for the buck. The rest of the supply chain remains lean, which keeps overall inventory costs low. Luna: I want to talk about the semiconductor strategy specifically. How are they dealing with chip supply long-term? Lucas: Toyota is doing something unusual: they're co-investing in chip fabrication lines with suppliers like Denso. Not just buying chips — they put money into the fabs themselves. That guarantees allocation. Luna: That's a capital-intensive move. How much have they committed? Lucas: They announced roughly 500 billion yen — about 3.5 billion dollars — over five years. That's small relative to their cash pile, but it's a big signal. They're essentially verticalizing for a few key nodes. Luna: And does that play into the broader trend of automakers becoming chip designers? Lucas: It does, but Toyota is more conservative here. They're not designing their own chips from scratch like Tesla did. Instead, they're working with Renesas to co-define standard chips that meet automotive grade. It's collaborative, not revolutionary. Luna: So the lesson from Toyota might be: you don't need to reinvent everything. You just need to see your supply chain clearly and invest in the choke points. Lucas: I think that's it. The old metaphor was a supply chain as a river — fast, continuous, no obstructions. Toyota now sees it more as a network of reservoirs connected by canals. You let the water flow fast where you can, but you build dams where you must. Luna: That's a good image. And the dams aren't permanent — they can be adjusted as risk changes. Lucas: Right. The question for every operations leader now is: where are your twelve-cent bolts?