Hi, I need help in identifying the correct wire in the back of a ‘01 EX radio with CD that is the main supply feed to the radio. I want to install a relay for my Nokia CARK-91 hands’ free car kit so it will turn the radio off when I make or receive a call automatically and turn it back on when I’m finished. I do not want to tap into the wire that make me input the secret code if there’s a break in that wire. Does the Helms manual have this info or the electrical trouble shooting guide? Can this be done on the EX radio?