When any company designs the electronics for a new car, they don't start on a clean sheet of paper. Existing designs are reused and adapted. Additional complexi

When any company designs the electronics for a new car, they don't start on a clean sheet of paper. Existing designs are reused and adapted. Additional complexity is introduced because some of the electronics are from third parties, for example this Gear Selector is interfacing with a Bosch transmission controller which controls a ZF transmission.