FW: [s-cars] Electrical draw/weirdness after shutdown

[Graydon D. Stuckey]

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/