You need a new antenna connection, possibly (probably) a new gateway, you may also have an external diversity unit that needs work and that's about it.
Upgrading 2nd generation radios (RCD 300, RCD 500) to 3rd generation (RCD 210, RCD 310, RNS 310, RCD 510) power drain issue
Upgrading 2nd generation radios (RCD 300, RCD 500) to 3rd generation (RCD 210, RCD 310, RNS 310, RNS 510, RCD 510) antenna adapter
CAN bus gateway removing, installing and upgrading - Volkswagen Golf
If you have the CD changer or Aux in you will need to do this
CD changer audio sound quality problems after changing head unit
Auxiliary input audio sound quality problems after changing head unit
Diversity info (should be a box under the drivers seat)
Aerial Information for Volkswagen Golf
Volkswagen aerial selection control unit / diversity information
Bookmarks