Wiring

["Al Powell" <APOWELL@agcom.tamu.edu>]

Jay asked about wiring for his radio.....................

My observations based on Bose system in 1990 200.

You really could benefit from finding a wiring diagram...but they are 
not always accurate.  However, they tend to be more accurate for the 
standard radios than for the Bose, which is totally undocumented

> 
> * 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)+?   

I think it's (unswitched Battery +) but this is a guess.  Check with 
a voltmeter for 12v present at all times.

>S-Kont?  

Dunno.

>GA?  I wrote "illum", but it's actually a picture of a sun.  I presume that 
>is the illumination signal. 

I think this is the light.

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

I agree.

> 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?

Data is the feed to the little window in the dash which shows the 
radio station.  Clock is a poser....I don't know, unless power for 
the clock loops through here, which I doubt. 

> 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?  

Normally, yes.  This is probably the line-out feed to the amp.  You 
found an easy (and important) one there!

> What is Com?  

Ground or Earth, as the Brits have it.
 
> There's also a spade lug on the chassis, with a brown wire.  I presume that
> they grounded chassis separately for some reason?

AH!!  Fooled you!!  This is the radio's connection to the alarm 
system - so it will sound if the radio is removed.  (Evidently only 
if someone breaks a window and crawls in without openind a door....)
This can be disconnected and ignored.
 
> Any help is appreciated.  I've got a brand-new Sony XRC-900 begging to be
> installed.

The good news with this is to concentrate only on finding the leads 
you NEED in the existing system:

*Left front + and -
*Right front + and -
*Power (Audis have no switched power - all are unswitched.)
*Ground
*Antenna (amplifier) relay must be connected, even tho you have no 
power antenna - it powers up the Audi antenna amps.
*Rear speaker amp inputs (the line-out connections you've described, 
and which you will use if you want to use the Audi rear amp.)

Those are the only connections you need.  The rest will be abandoned 
since you can't use them anyway.

Make sure not to leave any hot leads un-insulated!


+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Al Powell                        Voice:  409/845-2807
107 Reed McDonald Bldg.          Fax:    409/862-1202
College Station, TX 77843      
Http://agcomwww.tamu.edu/agcom/satellit/alpage.htm

Saunders' Slant: "If it's worth doing, it's worth hiring someone
 who knows how to do it."