A Little help please

[connor748]

I was fettling under the seat over the weekend and noticed this plug...

http://i92.photobucket.com/albums/l26/bluthunder_2006/IMG_1589.jpg

It has a blanking end in it and it goes into the loom but what does it do, or should do?

Any ideas?

Thanks

[Iconic944ss]

Diagnostic socket is my guess, sorry.

[skidlids]

Diagnostic socket is my guess, sorry.

And Frank wins a prize for guessing correctly

[connor748]

Thanks guys.