Help hooking up a audio interupt in wire?

i was hooking up my cda 9884 alpine deck into my scion tc. i have had aftermarket radios in this car before and never a problem. when i hooked this one up no sound came out at all. but i didnt hook up a pink and black wire call audio interupt in wire because i didn't know where to hook it up to i dont have one on my harness. what do i do? helper?!?1