I don't have Nav, so it's 315 only, and my Bluetooth module is underneath the passenger seat.
Part of your mod will depend on which module you have. The 9w3s I'm not sure have full compatibility for the RNS-510, so you might have to swap it for a 9w7 unit. You do not have a 315 though, that is only a part number for navigations. You most likely have an RCD-510, which is just a touchscreen radio. Since you don't have nav, you'll also need an aftermarket GPS antenna to receive signal. Lastly, you may need a new wiring cable to connect your bluetooth, microphone, and nav. I'm not exactly sure how it's wired in your car, as I had an RNS-315 to begin with.
1- The reason I mentioned VCSD, I read on some other threads that the Compass needs to be disabled in order for the Nav to work properly...any comments?
Yes, the compass will need to be disabled as there is an internal one in the 510. I can't remember if it has to be done via VAGcom, or if it needs to be physically disconnected. If it's physical, then the module is in the headliner in your trunk. There are some DIYs around on getting in there and disconnecting it.
2- There is a code for when the radio is first installed, is it provided by the seller?
You would have to check with the seller, but typically the code is provided.
3- Which part on the radio reference the Rev letter?[/QUOTE]
If you look at the part number on the back of any RNS-510, there will be a sticker with a barcode that says the part number "3C0 035 684" (or whatever the part number is) and then a letter. The letter at the end denotes revision. Typically, later revisions (G, H, K, etc.) are much more expensive. They also have a couple extra features such as Sirius Travel Link availability. It's up to you if you want those things.
