31 January 2026:
Have to back date this one a little, as pictures were taken, and work began, but this thread was not updated. Acquired a set of W205 C63S seats for the project. Unfortunately, there are two major problems with them. One is that the controls for the seats are on the door panels, and the second is that the computer for the seats is more than a little difficult to integrate into the W209 electronics this car will be running on. The easiest solution would be to use the seat controllers from a W164 ML63 that was parted out several months ago. This would allow for most of the movements of the seats, along with seat mounted controls. The physical mounting of the switches will need the side panels to be cut out of the W205 seats, but that has been done before on the M113K Crossfire, and it can be done again, here.


W205 Seat Controller

This is what the seat controller looks like. The one for the W164 is similar, but an older generation that will play with the W209 electronics of the car a lot better. It would have been possible to translate the protocols, and allow the W205 seat controller to work, but then this would have a domino effect, requiring switches in the doors, which would require cutting up the door panels, mounting them, then trying to make W205 door controllers work, which also would not play well with the rest of the car. Skip all that, and do this:

W205 Seat Controller removed and wires traced out

After removing the W205 Seat Controller, the wires for each motor or other function, such as heating, ventilation, airbags, Airscarf and power lumbar control were all identified. Then the W164 controller was added into the seat. This was tested, but have not finished up making it nice and neat, so there will be an update to this step, soon.