The RCD 310 main connector is divided into several sub-sections (chambers) that handle specific functions: Multi-pin Connector 1 (8-pin): Primary power and CAN-Bus connections. Multi-pin Connector 2 (8-pin): Speaker outputs (front and rear). Multi-pin Connector 3 (12-pin): Auxiliary inputs (AUX-IN) and telephone signals. Multi-pin Connector 4 (12-pin): CD changer control and audio inputs. 2. Pin Assignments & Functions Power & Data (Connector 1) Description CAN-Bus High

Pins 6 and 12 are often used for telephone audio signals in standard setups. Key Retrofitting Tips

The connector on the rear of the RCD 310 is a Quadlock system. It looks like a single large block, but it is divided into four colored sections (A, B, C, D). For the RCD 310, you will primarily use (Power/Speakers) and Block B (Aux/Speaker outputs). Block C is for CD changers (rare) and Block D is for MOST (optical) – which the RCD 310 does not use.

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.