I know on my 451 there is a wiring harness for fog lights. If I were to install factory fog lights and use a factory button set for the dash, I still have to take the car to a smart center or MB dealer so they can hook up their STAR computer at around $100 to tell the " SAM" to allow factory fog lights to work.I know that just about every part on the Fortwo can be repaired or replaced. But the big problem to a Fortwo owner would be troubleshooting electronic problems. I'm talking about the types of things that would require the Mercedes Star Computer system to troubleshoot or flash certain components of the electronics.
I seem to remember here on the forum it being discussed that if the SAM were to totally fail on your vehicle that you just couldn't purchase a used part and replace it on your's because of the serial number or mileage stored in it would be wrong. Can they be switched out and the vehicle still operate? I would guess that maybe replacing the Sam from another vehicle you would also have to have the matching ignition keys because the new Sam wouldn't allow you to start the car due to lockout.
Also can the ECU be traded from another vehicle since it holds firmware also? I would guess that other electronic devices like transmission controller etc,...could feasibly be replaced from another car without a Star Computer?