Why won't it work connecting it to the obd port? I have a similar unit to yours and its how I hooked mine up. Tommorow I will take a picture of the back of the harness and show you where I tapped mine in. I would have provided the information before if I had it but I was unable to because I did'nt have my car with me. Trust me though, you tap it to the back of the obd port to the corresponding wire, its much easier that way.