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I should have asked before, do you mean both front searts stop working or just the drivers door? The seat is what made me thing DCM, but that DCM can bring down other interior modules besides the things on the controls on the drivers door. And they are a common fail for some reason. Cheaply built I'd guess, or water gets to them possibly?
The dome light problem, I should have also mentioned to make sure the switch on the dome light is in the proper position, you can switch that to the "always off" position w/o realizing it and have the same effect. Unless it is working normally at one time and suddenly these problems all appear at once.
If you disconnect the DCM, hmmm, anything IN that door or controlled by a switch ON that door won't work, IIRC, anything electrical anyways. Power window on that door, power locking on that door, remote unlocking on that door or trying to operate the whole car unlocking from that door sensor, driver seat control, I think the dome light should work when you open that door as the switch isn't in that door. The sunroof should work, and can't remember where the steering wheel adjustment switch is on the 210, if it is on the door with the seat switch it won't work, if it is on the steering column it should work with the dcm disconnected I believe, not sure as it might be affected by the memory functions in the DCM. All the signals in to or out of the door go through the DCM except possibly the side airbag signals.
If you pull the door panel (interior trim panel) you will instantly recognize the DCM, stereotypical "black box" attached to the door, roughly in the area of the seat switch, but mounted to the door, not the seat switch itself, just sort of in that area.
As I used to work in a dealer I never had to resort to "unplugging it and see what happens" so not sure about that procedure, nothing really to lose I guess but time spent.
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