V50 General : - Alarms & Mobiles!

Ingulphus · Aug 8th, 2011, 19:07

So today the alarm in my V50 kept going off. It would go off, I'd turn it off and then one minute, two minutes later off it would go again. I could see no good reason for this. I chalked it up to the wind, but even when the wind completely dropped (it was never excessive), it still happened. Anyway, I looked inside the car on the off-chance there was a cat or something in there and spotted my mobile on the back seat. Could it be that? Surely not! But, as soon as I removed it, the problem stopped - and the wind didn't! So, given that phones are constantly transmitting, is it possible that somehow the frequency interferred with the alarm system?

tayandre · Aug 8th, 2011, 21:50

You could have something there. My alarm has gone off a handful of times for no apparant reason over the last 12 months. Just put it down to a glitch. Every time my mobile was in the car now I come to think of it. As far as I know it's only a 3G phone that I can link to it.

biggs312800 · Aug 9th, 2011, 07:07

im a chef and mine goes off with the microwave at work so i have to unlock my car whilst i use it, i have had the mass movement sensor replace 2 or 3 times and when i asked if the can do anything to recalibrate it they said no so looks like ive gotta live with it

imjohnson · Aug 13th, 2011, 23:57

That explains it!

I wondered why my car's alarm only goes off when I leave it for ten minutes while I pop into a shop but never when parked up for the night.

I often leave my phone in it if I am only leaving it for a few minutes. Doh!

Clan · Aug 14th, 2011, 09:25

The sensor is not ultrasonic ( sensitive to air movment ) but Radio frequency microwave, the car is filled with radio waves.. any disturbance in this pattern will set off the alarm , they use this so wind pressure from passing lorries doesnt set off the alarm . So it looks as if there is something in the mobile phone theory ..

Ingulphus · Aug 16th, 2011, 17:29

Thanks, Clan, that clears that up then - the mobile it is!

feltorange · Aug 16th, 2011, 19:36

I do a fair bit of cycling and use a pub carpark as a short cut. I noted that when I cycled through this car[ark, some car alarms were set off. presumably the signal from the wheel sensor. Great fun!

Bendolfc · Aug 16th, 2011, 23:13

I keep on meaning to test my sensor, when someone dumped a big ceramic plant pot through my rear screen, the alarm didn't go of.

Aug 8th, 2011, 19:07	#1
Ingulphus Member Last Online: Oct 10th, 2011 14:51 Join Date: May 2011 Location: London	Alarms & Mobiles! So today the alarm in my V50 kept going off. It would go off, I'd turn it off and then one minute, two minutes later off it would go again. I could see no good reason for this. I chalked it up to the wind, but even when the wind completely dropped (it was never excessive), it still happened. Anyway, I looked inside the car on the off-chance there was a cat or something in there and spotted my mobile on the back seat. Could it be that? Surely not! But, as soon as I removed it, the problem stopped - and the wind didn't! So, given that phones are constantly transmitting, is it possible that somehow the frequency interferred with the alarm system? Last edited by Ingulphus; Aug 8th, 2011 at 19:10.

Aug 14th, 2011, 09:25	#5
Clan Experienced Member Last Online: Today 23:14 Join Date: Jun 2007 Location: L/H side	The sensor is not ultrasonic ( sensitive to air movment ) but Radio frequency microwave, the car is filled with radio waves.. any disturbance in this pattern will set off the alarm , they use this so wind pressure from passing lorries doesnt set off the alarm . So it looks as if there is something in the mobile phone theory .. __________________ My comments are only based on my opinions and vast experience .

Aug 8th, 2011, 21:50	#2
tayandre Senior Member Last Online: Jun 25th, 2013 21:37 Join Date: Dec 2009 Location: Kilmarnock	You could have something there. My alarm has gone off a handful of times for no apparant reason over the last 12 months. Just put it down to a glitch. Every time my mobile was in the car now I come to think of it. As far as I know it's only a 3G phone that I can link to it.

Aug 9th, 2011, 07:07	#3
biggs312800 Senior Member Last Online: Sep 7th, 2016 10:03 Join Date: Oct 2008 Location: nottingham	im a chef and mine goes off with the microwave at work so i have to unlock my car whilst i use it, i have had the mass movement sensor replace 2 or 3 times and when i asked if the can do anything to recalibrate it they said no so looks like ive gotta live with it

Aug 13th, 2011, 23:57	#4
imjohnson Junior Member Last Online: Apr 26th, 2024 04:14 Join Date: Aug 2007 Location: Alston	That explains it! I wondered why my car's alarm only goes off when I leave it for ten minutes while I pop into a shop but never when parked up for the night. I often leave my phone in it if I am only leaving it for a few minutes. Doh!

Aug 16th, 2011, 17:29	#6
Ingulphus Member Last Online: Oct 10th, 2011 14:51 Join Date: May 2011 Location: London	Thanks, Clan, that clears that up then - the mobile it is!

Aug 16th, 2011, 19:36	#7
feltorange Junior Member Last Online: Feb 5th, 2024 15:16 Join Date: Jan 2011 Location: Holmfirth	I do a fair bit of cycling and use a pub carpark as a short cut. I noted that when I cycled through this car[ark, some car alarms were set off. presumably the signal from the wheel sensor. Great fun!

Aug 16th, 2011, 23:13	#8
Bendolfc Premier Member Last Online: Today 10:31 Join Date: May 2010 Location: Liverpool	I keep on meaning to test my sensor, when someone dumped a big ceramic plant pot through my rear screen, the alarm didn't go of.

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