BMW bluetooth install for Business CD radio (AUX, A2DP, USB)

Demo and install tips for bluetooth receiver in BMW E87 with basic Business CD radio. Bluetooth module supports Hands-free profile (HFP) so it's used as a phone kit, as well as the Advanced Audio Distribution Profile (A2DP) that is required for music and navigation guidance streaming.
Module is powered from the cigaret lighter fuse, through a 12V-to-5V converter. It turns on automatically every time ignition is on. It also automatically connects to the paired bluetooth device (in this video iPhone 6).
Sound is connected to the AUX input, hard-wired under the trim.
Microphone is installed in the dome light for a clean OEM look.
This device is equipped with USB port and microSD card slot. When connecting an USB drive or memory card it will automatically switch to that source and play music files from the flash drive.
In the future I'll add 3 control buttons to answer calls, end calls, play, and pause track, and browse through tracks.

Bluetooth module can be found on AliExpress, it costs about $3-$5 including world-wide shipping. AliExpress: https://www.aliexpress.com/item/5V-Wi...

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