Mazda is shifting part of its wiring harness production back to Japan after developing an automation-friendly assembly process with supplier Yazaki. The new approach targets CX-5 harnesses and could strengthen supply resilience.
Mazda Motor is bringing a portion of its wiring harness supply back to Japan after devising a new manufacturing approach that makes the traditionally labor-heavy work suitable for automation, according to Nikkei.
The company has developed the process in collaboration with Yazaki, a major automotive parts supplier, focusing on wiring harnesses used in the Mazda CX-5 sport utility vehicle. Wiring harnesses—bundles of electrical cables and connectors that distribute power and signals throughout a car—have long been difficult to automate because their assembly typically involves intricate, flexible components that are easier for human hands to route, bundle and secure.
By redesigning part of the production flow with robots in mind, Mazda and Yazaki have been able to automate portions of harness assembly that were previously done largely by manual labor. That shift changes the economics of where the component can be made: if fewer workers are needed on the line, producing harnesses domestically becomes more feasible despite Japan’s higher labor costs.
The move represents a form of reshoring—returning manufacturing activities to a company’s home market—enabled not by simple relocation but by reengineering the process so that automation can handle tasks once considered too complex for machines. Mazda’s decision applies to part of its wiring harness production rather than the entire supply chain, reflecting both the technical challenge of automating every step and the industry’s tendency to diversify sourcing for critical components.
Mazda has already put this approach into practice for harnesses destined for the CX-5, demonstrating that at least some segments of the product can be built with robotic assistance at scale. The company’s collaboration with Yazaki also underscores the central role of suppliers in automotive manufacturing, where even large automakers typically rely on specialized partners for key subsystems.
Why it matters
Wiring harnesses are essential to modern vehicles and have been a weak point in supply chains because they are complex to build and heavily dependent on labor. If Mazda’s automation-driven reshoring proves reliable, it could reduce vulnerability to labor shortages and overseas disruptions while setting a model other automakers and suppliers may try to replicate. The next question is how broadly the technique can be applied—across more harness types, additional vehicle lines, and a larger share of total production.