[s-cars] Curioser and curioser

[Robert Myers]

Another bit of investigative results:  The "little metal contact" (when 
finally seen in bright sunlight [oh these old eyes :-( ]) in there turns 
out to be a white plastic plunger control button for a push-On/release-Off 
switch.  When pushed contact is made between pin 30 (which is +12 volts 
from power source) and pin 86S (the "S" part is a bit hard to read so I'm 
not positive about the designation).  Releasing the plunger breaks the 
circuit.  This could well be the feature which turns the radio off when the 
key is removed.

Does anyone have the "other" switch at hand who could check this switch 
variant?

Bob

At 09:18 AM 8/13/2007 -0400, Robert Myers wrote:

>Bob,
>
>I just discovered that I hadn't discarded the old switch as I thought I 
>had.  Looking at the key end of the switch I see a small metal part inside 
>the "screwdriver slot" which I don't recall from other switches I've 
>seen.  I guess I need to do some checking.  Dunno if I'll get to it before 
>leaving for DC tomorrow AM.  It will be a week before I get back 
>home.  Pressing this part further into the body of the switch shows that 
>the metal part in there is spring loaded with a fairly stiff 
>loading.  I'll investigate further when I get a chance later - possibly today.
>
>The part number printed in the switch is 4A0 905 849 B.  This was the 
>switch which left the radio turned on until removing the key.
>
>Bob
>
>
>At 07:31 AM 8/13/2007 -0400, Robert Rossato wrote:
>
>>It sounds like the switches have been revised internally.  My '93 VW
>>Corrado (and maybe a few years earlier) has the same feature - the radio
>>will stay active until the key is pulled out.  In order for this to work
>>the radio is wired so that it gets a secondary power signal from the "S"
>>terminal at the back of the ignition switch.  It sounds like the "S"
>>terminal is now constantly powered.
>>
>>It's been a while since I played around with one so I forget the exact
>>mechanics of it, but essentially when the key is pulled it allows a
>>spring loaded mechanism in the electrical half of the ignition switch to
>>interrupt the circuit going through the "S" terminal.  Maybe there is an
>>additional slight movement of the engagement tab between the mechanical
>>and electrical portions of the ignition switch that allows this when the
>>key is removed.
>>
>>I would take an old and new switch and check continuity through the "S"
>>terminal as you use a screwdriver to go through the range of motion in
>>the switch.
>>
>>BR
>>
>> > -----Original Message-----
>> > From: s-car-list-bounces at audifans.com
>> > [mailto:s-car-list-bounces at audifans.com] On Behalf Of Fred Munro
>> > Sent: Saturday, August 11, 2007 7:49 AM
>> > To: Robert Myers; Pasqualoni, James E; yo-cello at comcast.net;
>> > s-car-list at audifans.com
>> > Subject: Re: [s-cars] Curioser and curioser
>> >
>> >
>> > Bob;
>> >
>> > It's curious that Paul has the same problem and his box has
>> > the right part
>> > number on it. Do you have the old switch? How does the switch
>> > know the key
>> > is in the lock? Is there a pin that the end of the key
>> > depresses when the
>> > key is in place? It could be that Audi is packaging the older
>> > type switch in
>> > both boxes. If you can determine what feature on the switch
>> > makes the key
>> > function work you can visually check that the new switch is
>> > the right part.
>> >
>> > Fred
>>
>>
>>--
>>No virus found in this incoming message.
>>Checked by AVG Free Edition.
>>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date: 
>>8/12/2007 11:03 AM
>>
>>
>>
>>
>>--
>>No virus found in this incoming message.
>>Checked by AVG Free Edition.
>>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date: 
>>8/12/2007 11:03 AM
>
>
>
>_______________________________________________
>S-CAR-List mailing list
>S-CAR-List at audifans.com
>http://www.audifans.com/mailman/listinfo/s-car-list
>
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date: 8/12/2007 
>11:03 AM
>
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date: 8/12/2007 
>11:03 AM