Loose wire found in engine bay

[Jeremy5848]

While doing some 300D engine bay cleaning, I removed the windshield washer reservoir (it was dirty inside as well as outside -- I guess the soot gets everywhere) and cleaned the chassis all around it.

While so doing, a loose wire flopped out from somewhere. It is actually two wires, one brown and one blue, in a piece of black tubing. The tubing comes out of the wire bundle that runs down the left (driver's side) fender and splits off to various places like the headlights, a/c compressor, windshield washer pump, etc. The two wires are not heavy gauge -- 20 or 18 at the most. They appear to have broken off of something long ago but as far as I know, everything works.

I know that wiring harnesses sometimes have wires for options that aren't in every car, but those wires are usually taped off. These look like they had been used at one time. The brown wire was sticking out of the tubing and had some exposed conductor while the blue wire was back in the tubing until I pulled it out for the picture.

The wires are long enough to reach anywhere on the left front part of the car. They don't belong to the horn or the lights or the auxiliary fan. I haven't looked at the schematic and can't imagine what purpose they might have served. Any ideas?