25;
It could be a wire intended for an optional Rear Wiper which was not fitted...check also that color code on Wiring Diagram...
Referring to WD here:
https://www.sw-em.com/Wiring_Diagram...iring_Diagrams ...I do see a Grn dotted wire indicated for the optional OD so this is also a hint...
Is there an OD fitted but not working? If not, call that wire the FM antenna, and don't worry about it (you could also check if it is energized with Ign OFF or ON, and if it is by which fused circuit...again if everything is working as it should, I'd insulate it well, and call it a spare wire in the harness.
Good Hunting!