aznomb

i'm installing a pioneer unit avh-p4100dvd in my 2003 civic lx coupe. i removed the dash and installed it in. i wired everything with the harness and a relay to bypass the security system. there was a yellow/black wire that is labeled "mute". i don't know where to connect it to. the harness i bought doesn't have a yellow/black wire. when i turn on the unit, everything works but its mute. it even have the word mute on the screen. please help...