If you are using this wiring diagram to upgrade, note:
The is your roadmap to a successful audio project. Whether you are fixing a crackling speaker, installing a powerful subwoofer, or swapping to a modern touchscreen, understanding the Quadlock pinout saves time and money. Remember: Block A is your power and speaker lifeline, Block B handles auxiliary inputs, and you will need a CAN adapter for most 2010+ VW models. Vw Rcd 310 Wiring Diagram
Below is the industry-standard pinout for the RCD 310 Quadlock connector. Use this as your primary reference when splicing or testing with a multimeter. If you are using this wiring diagram to