OK, I've got the coding table, here's a sort of interpretation:

Radio soft code is 5 digits, all are binary values from 0 to 7.
The three options within each field are valued at 1, 2 or 4 (for on) and are added to give the value. Standard binary stuff.

First digit = 0
Second digit = 0 for A8 or Bose (Sound curve, uses other values for other models without Bose, e.g. A6-C5 is 2)
3rd digit = FaderOff(1), BoseDisplay(2), ActiveAmpPhoneDeactivate(4)
4th digit = Navigation(1), Telephone(2), VCS(4)
5th digit = DiversityBox(1), CDchanger(2), MFSW(4)

Not sure that makes sense of my 00117 and 00207 codes though.:Confused:

Be aware that USA coding seems to be nowhere near the same as Europe. I found coding values quoted for our A6 that were completely off the wall compared to what it should be!

I read the code off the A6 stereo to know what to change it for, but when I got in to the soft code entering page it came up with a guided list of each number to enter which tallied with what I had from the old one

HP, what ELSA suggests?

Good point - forgot it was in there! Attached....

Now that makes much more sense. +++
The coding I have is in your document as MY02 onwards.
The "up to MY 01" seems to make total sense on all the kit I have, even though my car is a D2 made in 2002 (registered 2003!).

00117 is pretty standard Bose. 00207 is standard non-Bose with powered rear speakers. 00507 would be for unpowered rear speakers.

Given my rear speakers are so useless I wonder if they are powered or not - will have a look tomorrow if it's not raining. +++
I have the fader set heavily to the rear to compensate. :rolleyes:
(I had the covers off when fitting the ski hatch but didn't inspect the wiring :( )

Edit: Thinking about it, the rear speakers were working when coded for Bose, so that suggests that they are indeed powered. Odd they're so quiet though. :Confused:

That's for a Bose system without telephone. :cool:

Would it be too much of a risk to change the coding to unpowered? Obviously I'd change the fader to minimise the rear first. :rolleyes:
What sort of voltages are used in each case - anyone know?

I think if you code RNS-D 'non-BOSE' you won't hear anything since in BOSE config RNS-D send L and R signal to BOSE amp via line-out pins and doesn't use normal directly connected speaker pins. If your car had BOSE from day one your speaker pins are not connected. The sound goes from RNS-D pre-amp via line-out pins to BOSE amp in your boot.

Well yes, but non-Bose mostly still use amplifiers for the rear speakers. Which is why it's an option in the coding tables for RNS-D.
The amplified speakers have extra wires as the amps are in the housing under the parcel shelf. And according to one source I read they then feed the rear door speakers.

The FACT that I had sound from my rear speakers (door & shelf, but not front door) with Bose coded in the RNS supports that.
Which connections are used from the RNS I don't know, but it would make sense for the fronts to use the powered connections and rears to use the lineout ones in that "mixed" configuration.

Was your car manufactured as BOSE car?