Bose QC15 headphone cable pinout schematic

I love my old Bose Quietcomfort 15 headphone, so much that I decide to add a Bluetooth receiver to it to keep it in service for a couple of more years. During the process, I needed to DIY a short audio cable to connect the headphone and the Bluetooth receiver. I couldn’t find any information about the pinout on the Internet, so I disassembled the original cable to find out the schematic.

QC 15 audio cable disassembled.
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