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To add some other notes for posterity (and those who stumble on this later)...
The yellow seat connector is a BMW part # 6 954 587
Search eBay for a "BMW Seat Wiring Harness" you will find a number of them for $30-$40 that have the right "donor" thicker gauge red & brown seat heater power wires, and more importantly the seat connector pins. I tried to buy the pins from Mouser but was told that they are a proprietary BMW component.
The red wire goes in pin 8 and brown in pin 13 on the seat connector, then wire in your commodity seat heating elements to the donor red/brown power wires.
Thank you for this! My 987 Spyder came w heated sport seats. I replaced them w the OEM buckets and always wanted to get heat in them, especially considering the car is wired already. I just didn’t know what pins in the harness to connect.
Got an aftermarket heating pads after I saw your post and installed them in the seats and now I’m a happy (and warm) guy.
I can only say nice things about Classic9 Leather.
Not a paid endorsement - just a happy customer.
Really completes the extended deviated stitch on my car....