Even 20 years ago, manufacturers were already using computers for fuel injection, timing, dual-clutch transmissions, lights, locks, and more. In fact ECMs were standard in most higher-end cars by the 70's and most cars in general by the 80's, at least here in the States. Of course, things like power locks and windows would not become more common until later since they were a "luxury feature" for a time.
Might want to check your manuals and confirm what ECUs your automobes actually contain, I'm sure you'd be surprised.
