550 Maranello alarm siren goes off while driving - Ferrari Life
 
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post #1 of 3 Old 06-13-2013, 01:42 PM Thread Starter
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550 Maranello alarm siren goes off while driving

It happened yesterday and again today a couple of times: while driving my 1999 550 Maranello through town, the alarm siren goes off, and I can't seem to be able to stop it. The engine continues to run perfectly.

The siren was replaced 12 months ago during the cam-belt service, but it had never given me any problems until now.

Anyone has an idea of what can be wrong?

Current & past: 365 GT 2+2, 550 Maranello, F430 Scuderia
Other: Mercedes 230 SL 'Pagode', BMW M3 E30 Evo II, Lancia Delta Integrale Evo 2 and a few other toys.
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post #2 of 3 Old 06-14-2013, 04:45 AM Thread Starter
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I reply to my own post, as I have just been given a reason of what can be wrong.

I happened to speak today with a friend who is a technician at a VW/Audi garage. He mentioned that this is a common issue in VW/Audi cars, and it is related to hot air triggering the alarm sensors inside the car. He mentioned the sensitivity of these sensors can be adjusted (at least in their cars).

Interestingly, in the occasions my siren was triggered, I was driving at slow speed (if I remember well, starting from stop signs or traffic lights) with the windows down in hot days.

We all know how much hot air comes from these V12s, and if your windows are down when the car starts moving forward, you can feel it in your face. Maybe this is what's happening to my car. Does it make sense to those more technically-oriented here? Are you aware of a way to adjust the sensitivity of these sensors?

Regards.

Current & past: 365 GT 2+2, 550 Maranello, F430 Scuderia
Other: Mercedes 230 SL 'Pagode', BMW M3 E30 Evo II, Lancia Delta Integrale Evo 2 and a few other toys.
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post #3 of 3 Old 06-15-2013, 06:26 AM
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Take a look, here...

There was a specific TSB regarding false alarm triggering in hot temperatures.
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File Type: pdf sc209 Bosch Alarm System.pdf (2.52 MB, 264 views)

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