I like the factory stereo ( Black Macintosh with dual zone a/c ) and I want to keep it hooked up and used as the stereo. I'm also putting an android HU in, to use for everything except the stereo - maps, BtSsm, bluetooth phonecalls etc. It will also be able to have Apple Music app on it so I can have my music library on it. I've seen the Aerpro adaptor cables for putting in an aftermarket HU in the car so you don't have to rewire half the car. Is there such a cable so I can keep the factory stereo working, and also plug the new android HU in? so when I play music on that it'll come through the factory HU on the AUX IN and play on the factory speakers?
I have an FSL27 and a Berringer UCA222 ( the red one ) from my old Nexus install, so I could get the music from the new HU to the factory one that way, but that still leaves me trying to get power to the new HU nicely, not to mention the other wires labelled "Key1", "Key2", "Lamp contro", "Back", when I work out what they do / how they work, and "auto ant" ( won't need this cos no antenna ).