Lots of structural metal components have been replaced with polymers since the CAFE standards began in 1975. Electrical components, not so much. The CAFE standards (Corporate Average Fuel Economy)are about fuel economy. Light weighting is but one way to help achieve those standards....and tiny electrical components weight savings are far from the weight savings results you would get from a polymer fender, hood, or bumper. And then we have life cycle. Electrical components, small that they are, tend to be necessarily functional as long as the vehicle is in operation. Hmmm, plastic versus metal functionality over long periods.....for a few pounds weight savings. Might be a tough sell. 14 years and counting....
Thin