95 A6q avant Central Locks and Alarm gone berzerk

Mark R speedracer.mark at gmail.com
Thu Jan 24 11:49:29 PST 2008

Mike, I'm not sure if central locking is accessible via VAG-COM.  I'd start
there, if possible.  The disconnecting the battery trick should reset a
faulty module....  I'd try again... this time make certain the alarm isn't
armed when disconnecting the battery... then after leaving it disconnected
overnight (or at least an hour), connect the +12V battery cable to the
ground cable by touching them.  This should dissipate any capacitance left
in the systems.  Then connect the battery and re-code your remotes.

At least, that's where I'd start.  It's certainly possible you damaged the
control module with a low voltage.

Mark Rosenkrantz

On Jan 24, 2008 12:52 PM, Mike Veglia <msvphoto at pacbell.net> wrote:

> Anyone here have any troubleshooting experience on C4 chassis
> alarm/central locking systems? I'm not sure if it is coincidence, or not,
> but my wife left the radio on and drained the battery last week. The battery
> did not go fully dead (central locks still worked and the radio never went
> to "SAFE" mode). However, we did operate the central locks with the IR
> remote key while under a probably low voltage condition. Now, beginning
> sometime this week, the central locks automatically lock when you start the
> car--I know, new Audis do this, but this '95 _never_ has done this in the
> past. Adding to that, sometimes (but not always) this demon that possesses
> the brains of the central locks now arms the alarm as well when it locks the
> doors after starting the car. The result then is the power door lock button
> no longer functions, one must raise the manual lock knobs to get out, and
> when you open the door the alarm goes off. In trying to figure out what was
> going on
>  last night the IR lock/unlock stopped working. I tried to "reactivate IR"
> and "recode the IR key" and had no response. Batteries in the IR key measure
> ~1.55v each (I was too tired to look up what they are supposed to be, but it
> was just working). I tried disconnecting the battery for a while (long
> enough to kick the radio to "SAFE") to hopefully "reset" the alarm/central
> lock brains to no avail. What now??? Any BTDT or known issues here on C4
> chassis mid-90s Audis? TIA
> Mike Veglia
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