From Ross-Tech Wiki
03124 - Terminal 30 - 3
- When found in address  - Central Electronics in Audi models such as the (8K/FL) 2008+ A4 and A5 make sure the fuse powering terminal T6f/3 at J519 is present and powered. Using a 2010 M.Y. A4 for example, the exact fuse position is ST2, SC5. Measuring block group 002.3 shows live data for Terminal 30 - 3 .
- See Factory Repair Manual for wiring diagrams.