[s-cars] Electrical draw/weirdness after shutdown

[Chad Clark]

Graydon, yes we are talking about the same part. Sorry I couldn't remember
the exact number of connections for vacuum and current but it is the module
wrapped tightly in foam sitting next to the battery. I searched briefly for
my receipt and the part# but of course, couldn't find it. More importantly,
I'll try and find that old QQ issue outlining this faulty module. I would
take this bet to Vegas that the "CVM" is your problem.

Chad


on 10/14/02 6:41 PM, Graydon D. Stuckey at graydon at elektro.cmhnet.org wrote:

> Guys,
>
> I forgot to cc the list on this.  Anyone have a copy of the Quattro
> Quarterly that can glean the salient points for me?  Thanks very much.
>
> Anyone have a used but good, late model "Centrel Locking/Alarm
> System/Interior light Delay Control Module" otherwise known as the Central
> Vacuum Module?
>
> Later,
> Graydon D. Stuckey
> http://elektro.cmhnet.org/~graydon/18wattmain.html
>> -----Original Message-----
>> From: Graydon D. Stuckey [mailto:graydon at elektro.cmhnet.org]
>> Sent: Monday, October 14, 2002 8:35 PM
>> To: Chad Clark
>> Subject: RE: [s-cars] Electrical draw/weirdness after shutdown
>>> Graydon, I'm almost positive I've got your answer. In fact, I've
>>
>> Chad,
>>
>> That's great!
>>
>>> Central Vacuum Motor (CVM) located next to the battery. It has
>> one or two
>>> vacuum hoses going to it and one electrical connection.  It
>> seems to only
>>
>> I hope we're talking about the same thing here. Mine has one
>> vacuum connection and three multi-wire connectors.  The connectors have
> 12, 6 and 16
>> pins.  It sits immediately outboard of the battery wrapped in foam.
>>
>>> you ever hear a clicking relay noise under the drivers kick panel
>>> after the car is shut off?  This CVM controls the power window
>>
>> Yes, exactly.  And now that I have connected the current shunt, I
>> can see that it draws over 50 amps when the relay clicks.  I've
>> also come back to my car on a couple of the few occaisons when I
>> left the battery plugged in and the alarm was feebly squawking
>> and the batterywas nearly dead.  I figure the alarm set itself
>> off when the battery died.
>>
>>> don't know what fails internally in this component(sounds like you've
>>> already had it apart and know more than I what's involved) There was a
>>
>> I've been in there and I recognized a few parts, but at this
>> point, I suspect it is a failed chip, not a discreet component.
>>
>>> The cure is to find a later model CVM from an A6/S6 as they
>>> updated/upgraded
>>> this part from the early cars('92 vintage) IIRC, last letter on
>>> the part# is
>>> a J('92) or B('94>). Just make sure it's from a '94 or later car.
>>> I found a
>>> used A6 unit in a salvage yard for $150. Cured all those
>> annoying battery
>>> drains/electrical issues and allowed me to keep my hair:-) HTH,
>>
>> That is very interesting.  I'm surprised that they didn't change
>> that module but otoh, I've come to recognize that as a virtue
>> that Audi sometimes holds near.  There are a few parts that they
>> don't redesign for a very long time.
>>
>> I'll either buy a new one or find one in a wrecking yard and see
>> if that solves the problem.
>>
>> Later,
>> Graydon D. Stuckey
>> http://elektro.cmhnet.org/~graydon/
>
>
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