Founded in San Diego, CA in 1986 as a Maquiladora company, O&S California Inc is a joint venture between Tokyo Exchange Listed Company Onamba, Inc and Sumitomo Electric Ind Ltd.,
with a factory location in Tijuana, B.C.

For the last 32 years, we have been producing wire harnesses for the automotive, consumer electronics and lighting industries. (Under IMMEX Program)

Our second factory was established in SENDAI Industrial Park in Valle De Santiago, Guanajuato, June 2015. In this location, we produce wire harnesses primarily for the automotive industry.

  • Products and services

    • Wire Harnesses – Mid/Small Size Harness Specialist Our products included wire harnesses for: • Seat Belt • Airbag • Door Mirror • Gear Shift • Steering wheel
  • Certifications

    • ISO 9001:2015 • IATF 16949:2016 • ISO14001:2015 • OEA Operador Economico Autorizado • EICC-Electronic Industry Citizenship Coalition • C-TPAT (Asociación Aduanera-Comercial contra el Terrorismo)
  • Capabilitites

    From design to final product wire harness manufacturing sites assure product quality with redundancy in-process test and our in-house design of fixtures, jigs, electrical testers, crimp force monitors on all our auto-cutting wire machinery.