Hi, I had this problem on my 240 a couple of years back. It turned out to be a break in the wiring where it passes from inside the car through the little rubber gaiter and into the door. I`m assuming that over the years with all the opening and closing of the door the wire eventually breaks. If you pull back the rubber gaiter you should be able to see if there is any damage. I simply reconnected mine with a small block connector and its worked fine ever since.
Good luck, Dave
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