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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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C70 alarm triggered by outside vibesViews : 623 Replies : 7Users Viewing This Thread : |
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Mar 5th, 2019, 18:01 | #1 |
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C70 alarm triggered by outside vibes
'06 C70 frequent false alarm
The alarm can be triggered by vibration from outside: passing (loudish) motorbike or lorry, etc. Sometimes it just goes off for no apparent reason: I understand from other posts that this can be due to a duff siren battery et., however, I want to concentrate on its being over-sensitive for now... No dangling wires etc. in the passenger compartment. If I could find the ultrasonic (I assume) transmitter or receiver, I'd try covering either with some light material to try and mute the sensitivity. Any bright ideas? |
Mar 5th, 2019, 18:34 | #2 |
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Last Online: Jan 10th, 2024 06:10
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Have you not got the reduced guard function on your alarm? If so have you tried it and does it make any difference?
This is of no help whatsoever, but two doors down from my parents own a v50 similar to mine, and when I operate my central locking it triggers the alarm on that car. |
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Mar 11th, 2019, 17:20 | #3 |
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Last Online: Sep 17th, 2023 23:56
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Thanks for the reply.
It would appear not. I've been through the menu and as far as I can see there's no alarm options. BTW, I've just discovered it's a microwave set-up, not ultrasonic. Supposedly so it works with the roof down... So I guess it'd be back to the tin-foil (with matching hat). |
Mar 11th, 2019, 21:59 | #4 |
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Last Online: Apr 17th, 2024 18:50
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My v50 does the same, if I do not disable it when I leave the car, the internal movement sensor triggers the alarm. If is too sensitive or defective, I do not know.
I do not mind deactivating/disable it. Every time I disable it, I get info. as "reduced guard, see manual"
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2007 V50 1.6D SE in Black - DPF off & Remap |
Mar 11th, 2019, 22:23 | #5 |
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There is a button up near the map lights that reduces guard?
I was getting random alarm triggers on mine, replaced the alarm siren internal battery, that lasted about 10 months then I got the same symptoms again, ended up replacing the siren module with a new one, has been fine for the last 18 months.
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2008 C70 D5 SE Lux Nav Geartronic |
Mar 12th, 2019, 13:33 | #6 |
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Last Online: Mar 6th, 2022 11:20
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Location: London
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alarm
hi,
could be issue with low battery in side the siren module |
Mar 19th, 2019, 13:10 | #7 |
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Last Online: Apr 24th, 2019 09:13
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Location: Glasgow
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Phone
My last mobile phone if left in the car used to set the alarm off!
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Nov 19th, 2019, 21:04 | #8 |
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Last Online: Sep 17th, 2023 23:56
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(Belated) Thanks for the comments there, chaps.
On our other Volvo, wires dangling from the rear-view mirror (for dashcam) if wobbled could trigger the alarm. So on the C70 we were leaving them on the centre-console, seat or floor. AFAIK, the C70's sensor is aimed exactly there, below window-height (as I mentioned above: so it can be used with the roof down), so if they wobbled, they'd trigger the alarm. By tucking any wires away, we seem to have dramatically reduced the number of false alarms. Still gets excited by loud motor bikes and reverberating lorries though.
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1998 V70 T5, B5234T3 |
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