FAQs > Installation> Q10: Why connect the AUX cable to the AUX-IN port under the armrest box?
The AUX cable transfers the audio from the android screen to the OEM BMW sound system, then audio work through BMW speakers. For some BMW NBT car models, it is ok not to connect this cable, but for the BMW CCC, CIC, and most of NBT, it needs to connect this AUX cable. Read more
For the BMW EVO system, the sound work through the USB, the installation is different, Read more
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