Now go back to the sterio end of the harness, youll see a grey ground wire with a loop on the end. That loop on the end uses one of the 4 gold colored phillips head screws that holds the mounting plate to the side head unit seen in the next two pics.
Once connected go ahead and reconnect the antenna and test the system to make sure its all working properly. You can go on the side the sub and adjust the sub gain and one other setting I cant recall at the moment.
After everything is set to your liking, reinstall the headunit with the 6 screws you removed to take it out, and reinstall the trim.
Pop in a CD and see how it sounds. i think it really makes the sound over all fuller. Its not thumping base but i am not really into big loud sterios. OEM sounds just fine.
So there you go. I hope this was helpful. t was my first how to and i did the best i could to make it as detailed as possible.
Any Questions just ask.
The harness was sold to me by 'sense of nature'