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After some tinkering I've determined that the problem is the wire cracked where it was straped to the metal seat bottom. It was strapped tightly to a sharp metal edge which eventually cut the wires. I was able to cut and strip the wire although I only had a half inch sticking out. I soldered on extending wire, reconnected and the light went out.
It was very difficult to do since I was working under the seat with barely any slack. After I taped everything up, shaking the wires give me an intermittent light so I suspect I'll be doing it again pretty soon.
I'd still like to bypass the stupid thing and thanks to the clown that put the wire strap on so tight against a razor sharp edge
That makes sense. The wire comes straight down from the seat cushion and then is tightly strapped at a right angle to a hole in the metal seat bottom. When ever you sit down, the wire is pushed straight down putting pressure against the sharp edge of the seat bottom. The heavier the passenger, the more pressure and probably sooner the failure.
An annoying design oversight that probably has cost countless Mercedes owners big $$s. You have to remove the seat, disassemble and remove the leather to replace the sensor. I suspect it could easily cost $600.
Thanks for your response Sleepwalker. I've posted this question on 3 different boards and so far you're the only one that responded.
After continued problems with this. I ended up buying the part at BuyMBparts.com for $130 and went to an auto seat upholstery shop (RR Seats, Plainview,NY) and had it installed. It was not very expensive and they did it quickly. Light is off now.