A4 Alarm sounding & fob not turning it off

[LC926]

Hi All
I had the pleasure in rushing outside this morning in my dressing gown as my wifes A4 alarm was going off.
Its a 51 reg 2.0 SE.
The remotes did nothing ( i tried the spare), Unfortunately the lock was frozen so that took me a while with deicer to defrost, and then i unlocked the car, alarm still sounding.
I tried holding the key in the lock both left and right, but still it didn't go quiet.
I also started the car.
I noticed the interior light wasn't on.

Now i have read other threads etc about the siren having battery issues so i stripped this out tonight and found its the later style and rather than cut it open i thought to check through service files and found out it was replaced in May 2006, so i can't imagine it being that, also i haven't been getting the 3 beeps as a sign the battery is dying.
It was -5 degrees this morning whether that is relevent ?

Another intermitant issue that may or may not be related so i'll mention it is the electric windows.
It only has front electrics, which go down ok, but won't go up again, however the passenger side will go up from that side, but neither switch on the drivers door will bring them up.
If i hold the key in the lock to lock the car the windows go up no problem so the windows themselves are ok.

Are these issues related ? if so what should i be focusing my attentions on?

Thanks for any help, it will be appreciated
Paul

[Dr G]

Had one in yesterday taht turned out to be a nearly dead battery and faulty tailgate latch causing all sorts of mayhem between them.

Edited by Dr G on Tuesday 5th January 09:26

[LC926]

a bit more going on, it happened again last night, when i went out this morning the indicators were on very dimly.
The battery was flat, so i wasn't sure if it was flat due to the indicators on all night, or the flat battery caused the alarm to come on.
I jump started the car but still the indicators didn't go off.
My wife drove it and after about 5 miles they went off but then the door locks went mad.
I did notice the CCU making a small noise, so i'm now wondering if its that ??
It was just as well i left the siren off else i'd really have upset people.
The battery is 2 years old, i believe the CCU also has something to do with the windows so that would explain the problems with those too i guess.

[TooLateForAName]

This sounds like my favourite VAG problem - water in the comfort module. Very,very common issue.

Look under the carpet and soundproofing in the passenger footwells - if there is any water /damp then you've found the problem.

There are two issues that cause this - either the pollen filter has been replaced and the cover is badly fitted or the drain holes arounf the area at the back of the engine bay are blocked. Either of these cause water into the footwell and the little ecu which controls things like internal lights/dash display/alarm/central locking/etc gets wet and fecked. I've had a passat driving around with the alarm going when this has happened.

You may need to remove the battery or at least the plastic cover at the bulkhead to get a proper look and access to clear the drains.

[Tame Technician]

+1 for the convenience control module, they are often sub-aqua and do that sort of thing when they are.

[LC926]

Ok, it turned out to be the convenience unit, but was not due to water, it was bone dry.
It seemed to only act up when it was extremely cold.
That has now been replaced and there was also some fried Can data wiring that was replaced.

Still have the window issues and now a intermitent misfire !! grrr

[Tom Standish]

I agree with the tame tech

check your footwell!!!

i have a passat and i have just been through this, drain blocking near wind screen and water getting in near pollen filter - BLOODY NIGHTMARE

check the passenger footwell

check this link, it is for a passat but sure it cant be too far from the mark for the audi

http://hubpages.com/hub/How-to-Repair-the-Comfort-...