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hi, it will be difficult to walk though this online. What I do have is the factory BMW full-vehicle wiring manual for this car - the most detailed and specific wiring information for this car that contains every circuit, wire color, component location, pin out, etc. It is 125 pages and again in the factory BMW document - nothing better exists. I propose that I can email you this document for a very fair incremental charge given its value rather than trying to step though this in a clunky fashion online. I am not able to post this document publically for obvious reasons so an additional charge is required to enable email delivery.