Yes. They are individual systems.
Quote:
Originally Posted by compu_85
Note that the control units for 1991 cars are different. I don't know if they interchange with prior years.
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They are non-interchangeable, the wiring is completely different at the switch. I'd imagine you could graft wiring harness and control unit from donor car, but seems like a lot of work. For me, I'm the only one who drives my car, so the memory function is all but useless.