I have just installed Sat Nav + in my 2003 S3
It is a RNS D unit from a 2002-2003 A4/S4 cut to fit.
Problem is that Iv'e followed the instructions on coding it for the audio via the nav-plus.com website and I'm not sure they are correct as the sound quality is not as good as my old Symphony 2 head unit.
In order to locate the speed signal I have had to remove the Bose ground wire from the harness at the rear of multi plug going into the nav unit. This has been confirmed by resident expert Craig that this wire does nothing only ground the BOSE system so I have grounded this wire elsewhere.
I have coded it as per the website http://www.nav-plus.com/instructions/programming.html
I am wondering what speaker system the S3 with BOSE has, are there no passive speakers (option 0) or are they 2 passive speakers in the front and 2 active in the rear?? (option 2)
Reason I'm asking this is different web sites say different things one says the BOSE system has option 0 and the other states option 2. To add further confusion my old radio was coded 00201 which according to the nav plus site meant 2 passive speakers front, 2 active rear and NO BOSE!!
However the headunit would say BOSE when I turned it on and I had instument display on the dash plus it sounded really good with loads of bass.
I have connected the old radio back in and confirmed the code but now as the ground wire is not in the right connector the radio fails to show the BOSE logo on startup as its getting a speed signal in that connector now, would this happen just because a ground wire is not there??
Sorry for the long post and loads of questions but I'm so near the end of the install now and it's doing my nut in and just want to get it finished!!