Just when I thought all the "ridiculous" answers were over, this guy chimes in! J/K

Thanks guys for all your replies. I have followed the cable as far pack as possible and I can't really make out were it goes to. And everything seems to be working just fine, so I assume it's what you guys said as far it being a cable for an option not included in my Coupe.

Once I find a definite answer, I will let post it here. Thanks again!!