A4Q Stereo Wiring? (long)

[Jay@aol.com]

Anyone who's installed their own stereo into a 96 A4Q:

What the hell do all the little wires do???

There's an incredibly cryptic diagram on the radio that looks like this
(apologies to AOL users and other proportional-font readers - copy this to
NotePad).


* Ground        *  Illum      *  S- Kont.    * Mute

* U(B) +        *  Switched   *  Main power  * GA

---------------------------------------------------------------------------

*             / *             *  \           *
             LF Spkr             RF Spkr
*             \ *             *  /           *
---------------------------------------------------------------------------

* AF-R     * Switched   * Clock   |  * Rem     * Clock  |   * RF     * RR
                                  |                     | 
     * COM          * Ground      |  * US      * Data   | * SW     * COM
                                  |                     |
* AF-L     * U(B) +     * Data    |  * ENA     * AFE    |   * LF     * LR
---------------------------------------------------------------------------

         CD                             OPTION                 LINE OUT

Note:  The U(B)+ is actually subscripted, as in:

U +
 B


I get most of them.  Questions are..

Top section: What is U(B)+?   S-Kont?  GA?  I wrote "illum", but it's
actually a picture of a sun.  I presume that is the illumination signal.

Middle: Duh.

CD: I can probably completely ignore this since I'm not trying to feed from
an installed Audi CD player, yes?

Option: Oy, am I lost here.  I presume "Clock/Data" are some sort of serial
bus carrying data among Audi components.. can I just ignore this whole
section as well?

Line out: Well, although this says "line out", there's SOMETHING here that's
useful, because when you unplug this, the rear speakers go away.  I don't
have the Bose system.  Is there really an external rear amplifier?  What is
Com?

There's also a spade lug on the chassis, with a brown wire.  I presume that
they grounded chassis separately for some reason?

Any help is appreciated.  I've got a brand-new Sony XRC-900 begging to be
installed.

Jay