Why won't my AT&T Galaxy S5 start up Android Auto on my Pioneer AVH-4100NEX?

[AC Question]

My AT&T Galaxy S5 won't start up Android Auto on my Pioneer AVH-4100NEX.

I have a Galaxy S5 with Lollipop through AT&T and had Best Buy install my Pioneer AVH-4100NEX. I updated the Pioneer firmware, set it up to look for Android Auto on USB2, Android Auto is set to start automatically, and I have the phone and Pioneer connected via Bluetooth. However, when I plug the micro-USB into the phone, all it does is start charging; nothing pops up saying the phone isn't compatible or anything else and I don't get the Android Auto ToS message. When I pull up the AV menu on the Pioneer, neither the USB1 nor USB2 icons are lit up. I've tried plugging the phone in with and without the Android Auto application installed. I double-checked and Best Buy did plug the USB into USB2 using the USB cable from the box. USB Debugging is enabled on the phone (I read that caused a problem for someone else). Is there any way I can fix this? Thanks in advance for the help!

 

[Bill Murray1]

Re: Why won't my AT&T Galaxy S5 start up Android Auto on my Pioneer AVH-4100NEX?

I am having the same problem. Same phone, same Pioneer head unit. No tech support from Pioneer or the retailer from whom I purchased it through. I have tried everything I can think of. I am not sure if it is a faulty deck, or an Android Auto issue. Any suggestions would be awesome.