The RCD 310 does support the MOST optical ring. That is reserved for the premium RCD 510 or RNS 510 navigation units. If you see an orange plastic loop plugged into a blue block, that is for fiber optic—but again, not on an RCD 310.
have built-in Bluetooth; it requires an external module typically located under the passenger seat. AUTODOC UK AUX signal input, left. AUX signal earth/ground. AUX signal input, right. 3. Fuse & Troubleshooting Internal Fuse: There is typically a 10A or 15A blade fuse Vw Rcd 310 Wiring Diagram