dudu-lai 
In my Volvo I now have 4 devices connected: the original Volvo display, the original Volvo unit, the CAN-Bus box, and the new DUDUAuto head unit.
The CAN-Bus is working (steering wheel buttons are recognized). But I have no audio. I think the DUDUAuto must connect to the Volvo system via AUX, but AUX does not work in my car. I tried many times, but still no sound.
My question: is there any way to remove the old Volvo unit and display, and use only the DUDUAuto system for audio output? Or do I always need the old Volvo unit for sound?
Also, I cannot upload more pictures here in the forum – it says I have reached the maximum upload limit.
Upload max filesize limit reached from php.ini.
Thanks for your help!