My car did not have factory CD changer, but it did have the PCM "phone" function enabled. To get the install working, I needed a shop to enable the CD Changer, and disable the Phone Module. The Mr.12Volt "lives" on the CD Changer function in PCM. If I'm listening to radio, I tap the CD button to listen to the single in-dash CD (if loaded), and tap CD button again to cycle to CD changer functionality. Whichever "mode" I want to listed to on the Mr.12Volt (Bluetooth audio from phone, or AUX-In on Mr.12Volt) is then controlled by the CD number, as if I had two different discs loaded in the CD changer. During the initial install, the Mr.12Volt defaults to the AUX-In setting, so you have to scroll down and "change" which CD you are on in changer mode to get Bluetooth audio working. Hope this helps

 

100% correct, good catch. Hands-free phone module uses the MOST connection too from what I recall. I searched the car for the module but didn't have it physically, nor was it enabled in PCM like @AIrey1507 had. If enabled and not physically installed you can get it working too for sure.