how to Enable bluetooth Aux input after market adapter wire mod

I have the right stereo 51824 disc/aux button my prius did not come with oem aux I got a blue tooth adapter to plug in to the CD changer port in the back I just need to know what wire need to be rerouted I understand the on the 20 pin connector I need to use 19 and 16 to enable it but it does not seem to work my prius is a base model with paper cups for speakers I upgraded them now upgraded the stereo to AUX/disc button just need help knowing what wires to connect can someone point me in the right direction?