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Having removed the symphony head unit to install RNS-E,I found 2 connectors,male & female that appear to connect to each other but were disconnected ! 2green,2 white,2 grey & 2 purple.Can anybody tell me what they are ??

I am guessing they are for the FIS display system.
This will tell the dashboard what the radio is doing and display the track number/radio station.

One wire will be a pos + feed
One ground
One Data Line
One Clock Line
One ENA line
One TX line
One RX line

Because I'm working on a little project of my own to eventually display info on the dashboard regarding boost pressures, air intake and whatever my new radio will be playing.

Bluebrakes wrote:I am guessing they are for the FIS display system.

That's true on an early (analogue clock) B5 S4, but later (digital clock) B5 S4's and all B6 & B7 S4's use the CAN bus to carry this information to the FIS/DIS.

So if archboldm has a late B5 or a B6 or B7 there will be a different explanation.

Personally I never rely on colours as a guide of the function of wires in cars - they can (and do) change between model years.

thanks for your input lads.My car is a "53"S4 avant.The ends are black if that helps,I took some photo,s of it,but I'm buggered if I can find out how to download them ??
regards Mac

archboldm wrote:My car is a 2003 S4 avant.

So that's a B6 then? At least my May 2003 S4 Avant was a B6!

So they are not clock/data/enable DIS connectors, since the B6 uses the Infotainment CAN bus to carry that data.

Yes Dave,it is indeed a B6, the DIS functions perfectly,so they're not for that,dont know if my car has a function that I dont know about,cos I only bought it recently !!
Mac

FOUND OUT !!! extra connectors for my parrot.

Ah! So they're not Audi wiring, that's why none of us knew what they were.

doh.

very true. they do change colour occasionally. But as a rough guide the for the area it was. A good enough guess.

thanks for your input anyway lads,it's appreciated !!