PeachParts Mercedes-Benz Forum - Need a little W140 wiring help please

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Need a little W140 wiring help please

So it's my second day with my '92 S600 mechanical marvel and I'm checking out all the nice new wiring, MAFs what nots, etc... Checking connections and giving them a shot of contact cleaner and this was just laying there under the red and green vacuum lines.

http://i158.photobucket.com/albums/t...0/121_0785.jpg

Two numbers on it: 03 5500 00 and 126.540.00.44
Two pin receptacles, a momentary switch and a red LED.

http://i158.photobucket.com/albums/t...0/121_0792.jpg

Where does it go? Anyone know? Thanks

It's the X11/21s1 switch, without a cap. Now I need to read some codes.