In the process of doing a basic upgrade of the sound system in the Z, I'm not looking for top end just a general improvement, I've already replaced the basic speakers with Aliexpress B&O's which are a big improvement but I've also I've picked up an all in one sub/amp under seat style unit to fit in the boot, I've run the cables for everything but need some help identifying an easy access switched live in the boot.
Thinking that the Bluetooth module should have a switched live I can tap into, anyone have a wiring diagram or know which wire it would be, other options/suggestions welcome but really would prefer not to have to route a cable all the way to the front of the car.

Thinking that the Bluetooth module should have a switched live I can tap into, anyone have a wiring diagram or know which wire it would be, other options/suggestions welcome but really would prefer not to have to route a cable all the way to the front of the car.
