Car Alarm

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M

mw

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Had problems with alarm coming on for no apparent reason recently.
Car had been left in garage for a week or so whilst I was away.
Re-setting the alarm seemed to make no difference, as did disabling internal sensors.
Even with car left unlocked and un-armed after a short while the thing started beeping again.
Audi Assistance turned up (was your local RAC man). He didn't seem to know what the problem was. It was the first A2 alarm he'd been called out to.
Taking the car on a run seems to have cured the problem - still a bit of a mystery though - and doesn't exactly inspire confidence.
Is there a way of locking the car without setting the alarm?
 
The first thing that springs to mind, does the alarm have a sensor for battery drain, whereby when the battery is low on oomph the alarm thinks it being bypassed and starts up, I had this on a after market alarm I had left the side lights on.

Driving the car would have restored the oomph in the battery and solved the problem.

Lee and Sheridan,
TDI SE, Dolphin Grey,
50% Brighter Bulbs : Original Audi 6 CD Changer (Fitted in proper location by me): Rear drinks holder
http://www.audi-a2.co.uk/uk18.htm
 
Lee: that sounds about right to me as well... Good thing you don't drive a new MINI. On them if your battery drains, the alarm won't sound, BUT it will open all windows for you and unlock the car so you can get in... thoughtfull hey? Especially if you left it outside in a rainsoaked long term airport carpark for two weeks! :D


_______________________________________________________________________________________
2001 A2 TDI SE Crystal Blue with Open Sky, 6CD Symphony, BOSE upgrade, DIS and HALF a winterpack!

and iPAQ 3970 with Sat-Nav sleeve

http://www.audi-a2.co.uk/uk23.htm
 
Its not that simple, the alarm I had used a 3 point immobliser and would lock (electronicily with battery backup) if the alarm went off, and could only be reset by the key fob. So even if you by-pass the battery there were 2 other points of immoblisation.

Lee and Sheridan,
TDI SE, Dolphin Grey,
50% Brighter Bulbs : Original Audi 6 CD Changer (Fitted in proper location by me): Rear drinks holder
http://www.audi-a2.co.uk/uk18.htm
 
I'll try to explain,

If you by-pass the battery ie. use another one. you can by-pass some alarms as there is no voltage drop.(older alarms)

However if you drain the battery or disconnect it there is a voltage drop and the immobliser "locks-out" the whole system so even if you fit a new battery the system will not unlock unless you use the alarm key fob.

New alarms check for voltage gains as well as drops.

With a 3 point system you typicaly immoblise the battery, ignition and fuel pump, so if the battery is by-passed ie. a difference in voltage the immobliser will "lock-out" the system.

This is not to say a theif can't by-pass part of the system, but insures they need to by-pass the whole system. This inturn means its less likly to be stolen by the "passer by" and as someone unfortunately found out CAR JACKED..

I think thats clearer???

Lee and Sheridan,
TDI SE, Dolphin Grey,
50% Brighter Bulbs : Original Audi 6 CD Changer (Fitted in proper location by me): Rear drinks holder
http://www.audi-a2.co.uk/uk18.htm
 
MW

I know that if you set the alarm with a door, hatch etc open, the alarm will sound-not the normal full sound but a beep-beep-beep. I wonder if it's a problem with this system?.

As for not arming it-can't remember but can you not lock the door with the key somehow to not set the alarm?. Old age creeping in!.

Steve - 2002 1.4SE petrol, Silver, black/black interior, Then an identical replacement 2003 A2. Now a Toyota Corolla 1.6 T-Spirit
 
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