I have a 4000nex. I'm using a micro bypass and no steering wheel controls. I use an oem lightning cable plugged into a pac usb plug. Whether I plug in before or after I start my car, I get the CarPlay screen on my phone but nothing on the Nex. I then have to turn the car off and turn it back on and I get CarPlay. Anyone else experiencing this?

Have you confirmed the USB cables are seated firmly on every connection? Have you restarted your iPhone? Unplugging and plugging back in the phone doesn't get it to work, only restarting the car?

On the back of the unit the lightning cable has to be connected to usb port 1 which i believe is the top port. Also, do you have the latest ios installed? I am on ios 8.1.2 on an iphone 6 but it works fine for me. I have a 2014 impreza and i purchased an adapter that connected the subaru arm rest usb port to the usb port on the back of the pioneer and then i use my anker lightning cable plugged into the subaru arm rest to my phone and carplay works just fine (4000nex).