[s-cars] ABS Off Light Problem - VAG COM

[Ben Swann]

Mark,

I don't know if S4 and the  other post '91  cars with OBD II have same type of interface
the older control unit or not.  VAG used a special scanner to interrogate the unit by
manual switches.  I have this and can scan the system for vehicles that use this
interface - it is inserted inline between the controller and the vehicle cable.  It
checks out the major components in the system - sensors, relays, pumps, etc.  I have
used it on several older ABS  cars including the '91 2Ctq20V, '88-90 200 and '85-88
5ktq.

However I thought the later cars interfaced with ABS and other systems with OBD and
could be interrogated with VAG-COM.  Sometimes these sub-systems do not "report"
properly to VAG-COM.

Maybe others have some clues.  If you think the VAG scanner is what you need to use,
come on down.

Most ABS controllers I've seen are under the seat.

Ben


[[Date: Wed, 16 Sep 2009 20:50:34 -0400
From: "Mark Pollan" <mpollan1 at aol.com>
Subject: Re: [s-cars] ABS Off Light Problem - VAG COM
To: <s-car-list at audifans.com>
Message-ID: <c3c.617310ad.37e2e1e4 at aim.com>
Content-Type: text/plain;	charset="us-ascii"

Gents:

I met up with Brian this evening to pull codes and I could not read/ connect to the ABS
module.  I first ran Autoscan and some trivial codes came up but no reading on ABS.
Going directly to the ABS module and no connection.  I tried several times to no avail.
I have access to an old HEX COM with the OBD II connector and the 2x2 adapter dongle.  I
would have suspected the dongle but connection was established with other controllers.

Thoughts?  Is it possible the controller itself is messed up?  I rang up Mark Turczyn as
I had already pestered Manny Sanchez and Mark though maybe the no read condition is due
to a bad connection to the ABS controller itself.  Seem plausible?  Where might the
controller be located as I gifted my Bentley to Mark when I sold the S6.

Any and all insights are greatly appreciated.  Brian is a hell of a nice guy and I'd
love to see this to closure but your help is definitely needed.

Thanks in advance,

Mark]