Aux Jack/ bluetooth issue HELP

[Claude9039u]

I need some help I have a U-Connect in my car and a PCC-6800 Mogul Phone. Here is the problem, when the phone is plugged into the Aux Jack of the radio for the use of the MP3 on the phone. The U-connect will make the call and hang up with-in seconds. So from what I can tell, when the phone is plugged into the radio its seeing itself plugged into a headphone mic jack and will not let the Bluetooth work correctly. (I have the same problem if I am in the car using a Bluetooth headset for phone calls and the phone plugged into the Jack for MP3. In another car.) So my question is this does anyone have a reg hack to fix this problem. And or does anyone know how to or which pin I can removed in the jack if that’s possible? Thanks!!!