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From: Dave Plowman (News) on 4 Jun 2010 05:21
Mate has a 9 month old Audi A3 fitted with the factory alarm. It goes off
for no apparent reason - but only after dark.

He's at his place in Spain (minus the car) for the summer, and I'm
looking after things here. Luckily, a next door neighbour also has a set
of the car keys as I live a short way off and wouldn't hear the alarm.
Basically I've been charging the car battery every two weeks.

I read the car owner's manual and you can disable both the motion and
ultrasonic sensors via push buttons on the driver's door jam - but this
apparently didn't work as it went off again. And simply resetting the
alarm with the zapper switches those interrupts back to normal.

I've tried rocking the car with the alarm on and this doesn't set it off -
nor does slapping a window hard. Both of which set off the alarm on my car
- which doesn't false trigger.

I've disconnected the battery and will contact the dealer today but
wondered if anyone had any fixes?

--
*If you tell the truth, you don't have to remember anything.*

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Michael on 4 Jun 2010 06:33
Dave Plowman (News) wrote:
> Mate has a 9 month old Audi A3 fitted with the factory alarm. It goes off
> for no apparent reason - but only after dark.

Yes when the battery starts getting cold. The sudden drop in voltage as
the temperature falls is seen by the system as a break in attempt. I'd
lay a bet that replacing the battery will cure it.


>
> He's at his place in Spain (minus the car) for the summer, and I'm
> looking after things here. Luckily, a next door neighbour also has a set
> of the car keys as I live a short way off and wouldn't hear the alarm.
> Basically I've been charging the car battery every two weeks.
>
> I read the car owner's manual and you can disable both the motion and
> ultrasonic sensors via push buttons on the driver's door jam - but this
> apparently didn't work as it went off again. And simply resetting the
> alarm with the zapper switches those interrupts back to normal.
>
> I've tried rocking the car with the alarm on and this doesn't set it off -
> nor does slapping a window hard. Both of which set off the alarm on my car
> - which doesn't false trigger.
>
> I've disconnected the battery and will contact the dealer today but
> wondered if anyone had any fixes?
>
From: Dave Plowman (News) on 4 Jun 2010 12:59
In article <huako1$psq$1(a)speranza.aioe.org>,
Michael <smichael(a)virgin.net> wrote:
> > Mate has a 9 month old Audi A3 fitted with the factory alarm. It goes
> > off for no apparent reason - but only after dark.

> Yes when the battery starts getting cold. The sudden drop in voltage as
> the temperature falls is seen by the system as a break in attempt. I'd
> lay a bet that replacing the battery will cure it.

Interesting theory. But a sudden drop in voltage?

--
*When a clock is hungry it goes back four seconds*

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Michael on 4 Jun 2010 13:52
Dave Plowman (News) wrote:
> In article <huako1$psq$1(a)speranza.aioe.org>,
> Michael <smichael(a)virgin.net> wrote:
>>> Mate has a 9 month old Audi A3 fitted with the factory alarm. It goes
>>> off for no apparent reason - but only after dark.
>
>> Yes when the battery starts getting cold. The sudden drop in voltage as
>> the temperature falls is seen by the system as a break in attempt. I'd
>> lay a bet that replacing the battery will cure it.
>
> Interesting theory. But a sudden drop in voltage?
>

Yes when the interior light comes on the alarm system senses the small
and sudden drop in voltage as the doors being opened and off goes the alarm.

Allowances are made for a small drop in voltage taking place over the
night but any deficiency at all in the battery will give a much more
sudden drop which will confuse the alarm.

It drove(pun intended) me up the wall the first time I had this as the
fault was not with the alarm at all which I had replaced three times
while trying to find the problem.





From: ARWadsworth on 4 Jun 2010 14:19

"Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote in message
news:5122308082dave(a)davenoise.co.uk...
> In article <huako1$psq$1(a)speranza.aioe.org>,
> Michael <smichael(a)virgin.net> wrote:
>> > Mate has a 9 month old Audi A3 fitted with the factory alarm. It goes
>> > off for no apparent reason - but only after dark.
>
>> Yes when the battery starts getting cold. The sudden drop in voltage as
>> the temperature falls is seen by the system as a break in attempt. I'd
>> lay a bet that replacing the battery will cure it.
>
> Interesting theory. But a sudden drop in voltage?
>
> --
> *When a clock is hungry it goes back four seconds*
>
> Dave Plowman dave(a)davenoise.co.uk London SW


It is the only reason I can find for house smoke alarms starting to bleep
(low battery warning) in the middle of the night and then stopping in the
morning. I am not sure that it is a sudden drop in voltage, just that it is
a drop in voltage.

Cheers

Adam


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