Pbsilberman
Member
An AUX1 harness wires a 3.5mm male connector to the input of the radio, and AUX2 harness adds a 3.5mm female plug which disconnects the output of the XM audio when you plug in a 3.5mm jumper into the 3.5mm receptacle.
Electrically, the input would be the same with both adapters to the stereo.
That what I thought when I bought the AUX2. However, after my harness install, the XM volume is lower when nothing is plugged in than it was before. I don't know if I have a bad connection in the harness or if the receptacle that does the XM/BT switching add resistance to the circuit lowering volume.
Also, the amp only adjusts the BT volume to FM level. The XM volume is still lower than FM.