I added a Sony unit a decade or more ago. I did not need to code anything.
I added an adapter
Connects2 - Vehicle Integration
Just a moment...
The harness you have bought will do the same
PQ QUADLOCK STEERING WHEEL CONTROL SIMULATOR ADAPTER FOR RCD330/RCD340/RCD360 | RCD330-SWA
Can gateway upgrade is for battery drain issues.
Some of the adapters have a fix so the gateway does not need to change.
Try this page for some learnings on coding and VCDS cables.
Upgrading and re-cording CANBUS gateway
MK4 GTI - Sold
MK5 Jetta Turbo - Sold
MK5 Jetta 2.Slow - Until it dies.
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