I NEED HELP !!! I purchased 2 Avic-d2 units. Ready to install and I have noticed some differences between the 2 plugs. Lets see if I can explain this. There are a couple wires that are different between the 2 plugs. 1 plug has the light green wire grounded, the other doesn't. From what I can find out, the green wire is the parking brake wire and needs to be grounded to bypass. IS THAT RIGHT? Next, looking at the plug if it were plugged into the unit, the far right wire on the top is blue on 1 plug and unhooked, and black on the other plug and wired to groung. Next, on the bottom row, from left
