So I have been struggling with the same scenario. I used to have an S3, which worked perfectly with ARLiberator, then I preferred AppRadio Unchained (which is a modified version of Pioneer's official, but limited app).
I have tried just about everything, disabling KNOX, trying to set SELinux to permissive, but nothing allowed touch controls on my radio. The only solution that I have found that is working today is the official AppRadio apk, released by Pioneer. This connects (very slowly) then only allows a handful of apps to work.
At least I can use Waze or some "approved" Pioneer apps.
That's all I got for now. Very, very disappointed that my S5 doesn't work like the good ole S3.
Hope this helps someone.
Originally Posted by Guntert
Any help would be great..