Until only recently, most companies manufacturing wiring harnesses utilized petroleum-based wiring insulation. Vermin creating nests within the wiring harnesses will undoubtedly be an issue regardless of wire insulation composition, however the introduction of soy-based insulation offered two major benefits: less expensive to manufacture and better for the environment. Although both benefits seem to outweigh any costs, users utilizing soy-based harnesses are experiencing higher infestation of mice and other rodents, attracted by soy-based harnesses.
In January 2016, a lawsuit filed against Honda claimed the soy-based wiring in cars was irresistible to rabbits. Later that year, a similar lawsuit was filed against Toyota. In July 2017, Hyundai and Kia were both sued for using soy wiring. Although there are many additives and solutions to prevent rodent damage to vehicles and wiring harnesses, for this reason we have chosen to utilize petroleum based wiring harnesses to prevent as much rodent damage as possible.