After installation of KOASON BMW Android display, if you meet such problem such as No sound or audio in android system, it is the wiring or setting issues. please check the following points :

• If your car has optic fiber(Ignore if no optic fiber), need to relocate it to android harnes.  Click for details
• Some BMW cars require connection to the AUX port to output sound

• Aux has two switching modes, manual and automatic.
• Some models not support Automatically switch AUX and need to be set to manual mode.
• Demo Video：https://youtu.be/6iieNn_cwT4

How to setup check below：

Automatic modes( different Android versions, different setup Routes):

setup Routes 1：

Go to System->AUX setting->Check "Automatically switch AUX" 

setup Routes 2：

Setting->Factory(code"2018")->Vehicle->AUX Switching modes->select Automatic 

Manual modes( different Android versions, different setup Routes):

If the AUX auto switching mode does not work, you can set it to manual mode

setup Routes 1：

Go to System->AUX setting->UnCheck "Automatically switch AUX", then go to OEM radio and Choose “Audio-AUX”, touch screen to android, sound out.

For car without oem screen models, choose "AUX" on CD panel

setup Routes 2：

Go to Factory setting->code"2018"->Vehicle->AUX Switching modes->choose "Manual" ,then go to OEM radio and choose “Audio-AUX” , touch screen to android, sound out

• Checking the volume value of the Android system

Note：

1.Some models not support Automatically switch AUX and need to be set to manual mode.

2. "AUX Switching scheme" is Amplifier selection, "Scheme A" is for " Alpine ", "Scheme H" is for "Harman ", "Customize" is for other brand, Choose it according to head unit brand

3.Whether in manual or automatic mode, keep values of AUX 1 and AUX 2 at "0"

4.Some cars with CIC system come with AUX function, but you can't adjust the volume in AUX status, you need to activate it at the tuning store, or contact us to activate it remotely as well.