Weird Alarm Noise - Alfa Romeo Forum
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Hmmm Weird Alarm Noise

Afternoon guys.

Today my alarm has a 2nd beep when i lock the doors. It comes slightly after the first one but not immediately (like it does when it is unlocked). Anyone got any ideas?

I have checked all the doors and boot to make sure they are shut.

Thanks in advance.
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Re: Weird Alarm Noise

Not sure if it's the same as yours, but my 156 does this second beep too at odd times, only real downside means I have to disable the alarm before opening the boot if the car is locked or annoy the neighbours if i forget. For me it only ever happens after heavy rain and ONLY if i've opened the bonnet!
If i waited for a couple of days (presumably until the micro switch on the bonnet beside the catch has dried out) then open boot/bonnet/doors, close them all (seems to reset the alarm?) and then lock the car the second beep disappears. Now i just ignore it and it goes away after 2/3 days.
It's been checked by the indi, for security purposes, but it seems everything works otherwise and to fix it seems to be a case of replacing micro switches one by one until the fault goes away but they don't consider it a real issue. Bonnet microswitch is easy enough to replace, but by the time you get to all of the switches and labour rates it's starting to look expensive for something that isn't really much of a problem, especially as it goes away by itself after a couple of dry days. I'm just trying to make myself remember Not to open the bonnet after heavy rain!
Probably spraying the switches with WD40 would get rid of the water, but I'd be more concerned about this holding onto dust etc. and making the problem worse than the occasional extra beep!

Hope this helps.
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Re: Weird Alarm Noise

I have had this occasionally on mine as of late. I too wouldn't mind knowing what causes it!
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Re: Weird Alarm Noise

Same with mine, never any problems with it though. Prob a sensor taking extra time to detect door locking
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Re: Weird Alarm Noise

It's usually the bonnet sensor. Open the bonnet and slam shut and check it is indeed shut tight. Service the catch as soon as you can. Ignore at your peril.
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