The RCD 310 supports four channels (8 wires) with a standardized color scheme in most VW harnesses: Front Right: Positive (+), Negative (-). Front Left: Positive (+), Negative (-). Rear Right: Positive (+), Negative (-). Rear Left: Positive (+), Negative (-). Auxiliary & Bluetooth (Connector 3) The RCD 310 itself does

The RCD 310 supports up to eight speakers with a 4 x 20 watt output. Positive (Pin 2) / Negative (Pin 6) Front Left: Positive (Pin 3) / Negative (Pin 7) Rear Right: Positive (Pin 1) / Negative (Pin 5) Rear Left: Positive (Pin 4) / Negative (Pin 8) 2. Power and CAN-Bus (8-Pin Section)

Before diving into the specific wires, it is crucial to understand the physical connection. The RCD 310 uses a (sometimes referred to as a "mini-ISO" setup). This is a large, single rectangular block that plugs into the back of the radio.