Yeah, I'm not sure where the colors of these wires are coming from.... but I don't think they are right.. at all.
Per Paul's pictures, you have a black, green, red/back and red/pink wire. I would assume these are the positive and negatives for the motor.. most like 12V and maybe a 5V source.
The only yellow wire I see goes to the CD changer...
So, I set mine up like Paul and it works fine. So I guess just let those comments be forwarned to anyone looking to do this as the color of wires might not be correct.