[s-cars] Curioser and curioser

[LL - NY]

Bob,

I have my "B" switch on hand, and it has the plunger you describe.
This is an OEM part from Audi, not aftermarket. I will be able to
electrically test confirm this a bit later.

LL - NY

On 8/13/07, Robert Myers <robert at s-cars.org> wrote:
>
>
> 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.
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> >>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date:
> >>8/12/2007 11:03 AM
> >>
> >>
> >>
> >>
> >>--
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> >>Checked by AVG Free Edition.
> >>Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date:
> >>8/12/2007 11:03 AM
> >
> >
> >
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> >
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> 8/12/2007
> >11:03 AM
> >
> >
> >
> >
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> >Checked by AVG Free Edition.
> >Version: 7.5.476 / Virus Database: 269.11.15/949 - Release Date:
> 8/12/2007
> >11:03 AM
>
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