What is my remote wire connected to on my Honda civic 2005 head unit?

I have an aftermarket head unit and this is the one i have http://www.cartoys.com/cdx-gt570up and i'm going to install a amp and subwoofer and cartoys installed my deck but i just looked at the remote wire that i would connect to the amp and something is already connected to it and i do not know what that is. I believe that the wire color it was connected to was either yellow and white or yellow and green.

It's the wire that activates your factory antenna booster. This connection is required to get good AM/FM reception, and it's connected to the remote output because your head unit does not have a true power antenna output. You can connect your new amp's remote wire along with the factory wire; the Sony deck's remote output should be able to support both.

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