I couldn't find it. It's on north american motoring. But it's there in the audio section somewhere. I'm certain the guys on here have figured it also. I'm 99% sure crutchfield offers the part.
basically, you have 2 or 4 fiber optic cables in the back of that radio. You need to close that open circuit to complete the MOST ring. It's a token ring of sorts, it HAS to be closed.
You then can code your radio out.