The depth of Japanese firms’ involvement in Mexico’s auto business is seen at Ashimori Trade’s manufacturing unit on an enormous industrial park in Guanajuato state, 400km north-west of Mexico Metropolis.
A bunch of principally feminine employees clad in baseball caps and gloves lean over workstations on the plant, within the heartland of Mexico’s auto business. They’re assembling tiny plastic and steel elements for seatbelt security mechanisms.
Ashimori, a Japanese car-parts producer, arrange the manufacturing unit in 2012, shortly earlier than Mazda started manufacturing at a close-by car meeting plant. The services are a part of the Japanese auto business’s $18bn of funding in Mexico, each in car ultimate meeting and part manufacturing. The selections have been made primarily based on low labour prices and unfettered entry to the US market. The Ashimori employees additionally make airbags, sunglasses and different elements for Honda, Mazda and different huge producers.
But US President Donald Trump’s menace to impose tariffs on imports to the US from Mexico and Canada has left the huge guess on Mexico by Japan’s automotive business trying newly dangerous. Automakers and their internet of suppliers are actually attempting to work out the right way to undertake any essential redrawing of future funding plans or reshaping of provide chains.
Trump initially stated in early February that he would impose 25 per cent tariffs on all imports from the US’s two rapid neighbours. Whereas he then backed down, hours earlier than they have been to take impact, he introduced solely a 30-day reprieve, till March 4. 4 Japanese auto firms now construct 1.3mn vehicles in Mexico yearly, greater than producers from some other nation.
Any tariffs imposed would have an effect on not solely accomplished automobiles however elements such because the 110,000 tyres that stream from Mexico and Canada into the US each day.
Nissan chief govt Makoto Uchida stated his firm wanted to be ready in case excessive tariffs have been imposed.
“Maybe we will switch the manufacturing of those fashions elsewhere,” he stated of the corporate’s Mexican manufacturing.
The Japan Exterior Commerce Organisation (Jetro) has stated that 4 vital Japanese investments in Mexico have already been paused due to the uncertainty.
Mazda and Honda have joined Nissan in warning they may transfer away from Mexico. Naohisa Komura, president of Plasess, one other Japanese automotive elements provider, which got here to Guanajuato state in 2014, stated funding choices would stay frozen till there was extra certainty.

“It’s extraordinarily tough as what Trump says retains altering,” Komura stated. “With out figuring out something in any respect, we will’t do something when it comes to enterprise choices.”
Nissan was the primary Japanese carmaker to arrange in Mexico, when it began constructing vehicles domestically for the home market within the Sixties.
Mazda, Honda, Toyota and lots of suppliers arrived within the 2010s after Mexico liberalised its financial system by signing the North American Free Commerce Deal (Nafta) with the US and Canada in 1992. Tariffs on vehicles have been eliminated by 2008. A renegotiated United States-Mexico-Canada Settlement (USMCA) changed Nafta in 2020.
Figures from Mexico’s nationwide statistics company present that 82 per cent of automobiles produced by Japanese automakers in Mexico final 12 months have been exported.
Mireya Solís, a Japan professional on the Washington-based Brookings Establishment think-tank, stated the previous investments have been primarily based on the belief international locations would search financial development by means of unfettered commerce.
“You could possibly belief you may effectively ship elements and do totally different processes in other places,” she stated.
But issues have been mounting even earlier than the tariff anxiousness. Naoko Uchiyama, professor at Tokyo College of Overseas Research, stated Japanese auto firms targeted for a few years on constructing compact vehicles for export to the US after they have been shedding market share to SUVs.
“They shifted to supply compact SUVs however their efficiency has not been nearly as good as anticipated,” Uchiyama stated.

Cautious Japanese buyers additionally must grapple with safety dangers. Guanajuato has the best murder fee of any state in Mexico, at present struggling severe violence from disputes between organised crime teams.
But, for the second, many executives say they’re searching for to maximise their operations’ effectivity, to resist any tariffs, relatively than eager about relocating.
At Japan’s Minebea Mitsumi in Guanajuato, plant supervisor Luis González stated they have been paying shut consideration to information concerning the potential 25 per cent tariffs however indicated they weren’t but chopping manufacturing.
The corporate was even considering bringing ahead some manufacturing, to make sure it may very well be exported earlier than imposition of any tariffs.
“It’s important to hold working; we will’t wait round,” he stated.
Executives and analysts anticipate the uncertainty to tug on, partly due to a renegotiation of USMCA due in July subsequent 12 months.
Takao Nakahata, senior economist at Jetro. stated that, in a tariff world, Japanese auto firms have been almost definitely to put money into Southeast Asian international locations, together with Vietnam, relatively than Mexico. They could additionally enhance US manufacturing, he predicted.
“Japanese funding in Mexico goes to be tremendous sluggish till about July 2026,” Nakahata stated.
González stated the principle change thus far was a rise in uncertainty.
“Proper now the intention is in search of how we will make enhancements to cut back the influence of that 25 per cent,” he stated. “Nevertheless it’s a big effect.”