please make sure you solder the connections with the ibus or it wont send signal. that was with my case i have an eonon ga9166a head unit with ibus
i had busines radio with cd player with dsp


take a look at what i have
https://www.youtube.com/watch?v=W3XOwNBQTUc


https://shop.ibus-app.de/en/shop/

you will need usb device app and lic