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2014 A4Q/8K 6MT MMI 3G+
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@klink79 : Did you check here: erWin – Homepage not logged on ? Get the 24 hour subscription and download all the related PDFs for your VIN/model (and as many others as you care to download during the subscription).

The standard heated seat connector (without neck heating) is the same as the B8 A4, and is controlled by the BCM/CECM/J519 directly in our A4 models. My guess is the thinner purple/white wire connects to the neck heating element temperature sensor. --g
 

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Looks like T6l/6 (purple/white) connects to J519 terminal T16b/4 as a control signal from the CECM/BCM, though you could tie this into any point on the LIN-bus (say, at connection point B549). The 2 J911/J912 relays likely have holders in/around the right rear fuse/relay carrier. My guess is that the relays are standard types, either half-size 404 (P/N 4H0951253C) or full-size 643 (P/N 4H0951253A). Do any of your documents describe the relays in positions A thru H in diagram A97-11504 ? --g
 

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The LIN bus carries control messages for various electrical components - in this case, between J519 and J846/J847, as shown in the first of your PDF files, above. The LIN-bus connection can be made anywhere. According to your wiring diagram, T16b/4 (purple or yellow/grey wire) at J519 is a LIN-bus connection. --g
 
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