This is more an informative post, rather than one asking for help per-se...
I've been working on getting a stereo system to work in my 2001 Vogue, as when I bought it the DSP amp was missing...
After a lot of searching on the web, and hours in the ETM trying to collate all the information, and find out missing bits, what everything connects to etc - and with a bit of searching on a couple of BMW forums for pinouts in their vehicles that use the same sort of system (sadly not an identical amp though ) I've managed to find out what everything does, including polarities for the speaker connections, head unit connections etc (which the ETM doesn't have)
So, as it was a wet, horrible day here in England, and with tyring to sort through to find come cable colours to wire in my crossover circuits I've built, I figured I'd put it all in one spreadsheet..
And after a few hours work, looking in the ETM again, and collating my pages of notes, I have attached the PDF file to this post.
I know there were a couple of threads where people were asking what connector did what, where it went, how it was wired etc - so instead of posting this in numerous threads, I figured it was easier to start this.
Anyway, I hope this is useful, or informative to some... If you find any errors or omissions, then don't hesitate to let me know, and I'll amend the document - I've tried to get complete accuracy, but there were a couple of bits in the ETM where there was no information (CD changer was a bit sketchy) so have tried as best as I can to search the web for correct info..
Please note also... this is ONLY for the models with the single DSP amplifier in the boot (1999MY On), NOT earlier models with the individual door amps (up to 1999MY).
Let me know if it's any use!
P38 Premium Stereo Wiring.pdf