C70 alarm siren going off as soon as doors are locked

phil1968 · Mar 3rd, 2017, 20:22

As per title, started doing it today, as soon as I activate the central locking via the keyfob remote the alarm sounds. I ended up having to pull the fuse for the siren control unit. Any ideas? Ta.

phil1968 · Mar 5th, 2017, 11:14

Ok, doing a bit of research it looks like the battery may have failed in the siren unit (it also leaks onto the PCB) -can anyone tell me where the siren unit is located on the 2nd generation C70?

dcw · Mar 5th, 2017, 22:14

Can't categorically say for the C70, but on the S40 it is under the scuttle panel in front of the passenger side.

Remove wipers and clips to remove panel and it is mounted there.

I think if you were to shine a torch through the grill part of the plastic you should see it before you go removing things - I can check that tomorrow if you'd like...

Must be at least a good chance it's the same on the whole family?

David

phil1968 · Mar 7th, 2017, 20:59

Quote:

Originally Posted by dcw

Can't categorically say for the C70, but on the S40 it is under the scuttle panel in front of the passenger side.

Remove wipers and clips to remove panel and it is mounted there.

I think if you were to shine a torch through the grill part of the plastic you should see it before you go removing things - I can check that tomorrow if you'd like...

Must be at least a good chance it's the same on the whole family?

David

Yes if you wouldn't mind looking, much appreciated

Agree, the C70 was based on the S40 so there's every chance it's under the scuttle panel as well

There's a tutorial on YouTube on how to replace the siren unit battery, but that's for a V70 & on those it's behind the O/S wheel arch liner.

cameron1 · Mar 7th, 2017, 21:08

This may help. Rob is also great member on this forum.

https://www.youtube.com/watch?v=vm_qGUegzw8

Cameron

dcw · Mar 7th, 2017, 21:18

Phil, just seen this. I'll look tomorrow on the S40 and let you know if it's visible - hopefully that'll let you make a worthwhile check on the C70...

David

phil1968 · Mar 7th, 2017, 22:23

Quote:

Originally Posted by cameron1

This may help. Rob is also great member on this forum.

https://www.youtube.com/watch?v=vm_qGUegzw8

Cameron

Thanks Cameron, yes that's the video I was referring to in my previous post

dcw · Mar 8th, 2017, 18:48

Right...on the S40 if you shine a torch in through the scuttle panel grille on the passenger side, aiming just under the windscreen give or take under the VIN number, you can see a metal, ventilated box. That is the siren module.

Can't remember now if the scuttle panel is exactly the same on the C70 but hopefully you will be able to do this and confirm the siren module is in the same place!

Good luck!

David

phil1968 · Mar 8th, 2017, 18:50

Thanks pal, that's much appreciated

I'll have a gander when I get a bit more time this weekend

phil1968 · Mar 9th, 2017, 18:44

Managed to have a quick look this evening & it is indeed in the location you described

It's a metal box with louvres. Thanks again

Mar 3rd, 2017, 20:22	#1
phil1968 Master Member Last Online: Jul 27th, 2020 23:19 Join Date: Aug 2015 Location: Chatham	C70 alarm siren going off as soon as doors are locked As per title, started doing it today, as soon as I activate the central locking via the keyfob remote the alarm sounds. I ended up having to pull the fuse for the siren control unit. Any ideas? Ta. __________________ 2008 C70 D5 SE Lux Nav Geartronic

Mar 5th, 2017, 11:14	#2
phil1968 Master Member Last Online: Jul 27th, 2020 23:19 Join Date: Aug 2015 Location: Chatham	Ok, doing a bit of research it looks like the battery may have failed in the siren unit (it also leaks onto the PCB) -can anyone tell me where the siren unit is located on the 2nd generation C70? __________________ 2008 C70 D5 SE Lux Nav Geartronic

Mar 5th, 2017, 22:14	#3
dcw VOC Member Last Online: Apr 18th, 2024 21:35 Join Date: Jan 2007 Location: YORK	Can't categorically say for the C70, but on the S40 it is under the scuttle panel in front of the passenger side. Remove wipers and clips to remove panel and it is mounted there. I think if you were to shine a torch through the grill part of the plastic you should see it before you go removing things - I can check that tomorrow if you'd like... Must be at least a good chance it's the same on the whole family? David __________________ VOC 400 Series Register Keeper The current fleet: 1997 440 LE, 1996 460 CD, 1994 480 GT and 2007 V50 SE Sport

Mar 7th, 2017, 21:18	#6
dcw VOC Member Last Online: Apr 18th, 2024 21:35 Join Date: Jan 2007 Location: YORK	Phil, just seen this. I'll look tomorrow on the S40 and let you know if it's visible - hopefully that'll let you make a worthwhile check on the C70... David __________________ VOC 400 Series Register Keeper The current fleet: 1997 440 LE, 1996 460 CD, 1994 480 GT and 2007 V50 SE Sport

Mar 8th, 2017, 18:48	#8
dcw VOC Member Last Online: Apr 18th, 2024 21:35 Join Date: Jan 2007 Location: YORK	Right...on the S40 if you shine a torch in through the scuttle panel grille on the passenger side, aiming just under the windscreen give or take under the VIN number, you can see a metal, ventilated box. That is the siren module. Can't remember now if the scuttle panel is exactly the same on the C70 but hopefully you will be able to do this and confirm the siren module is in the same place! Good luck! David __________________ VOC 400 Series Register Keeper The current fleet: 1997 440 LE, 1996 460 CD, 1994 480 GT and 2007 V50 SE Sport

Mar 7th, 2017, 21:08	#5
cameron1 Member Last Online: Apr 20th, 2018 02:13 Join Date: May 2016 Location: Nottingham	This may help. Rob is also great member on this forum. https://www.youtube.com/watch?v=vm_qGUegzw8 Cameron

Mar 8th, 2017, 18:50	#9
phil1968 Master Member Last Online: Jul 27th, 2020 23:19 Join Date: Aug 2015 Location: Chatham	Thanks pal, that's much appreciated I'll have a gander when I get a bit more time this weekend __________________ 2008 C70 D5 SE Lux Nav Geartronic

Mar 9th, 2017, 18:44	#10
phil1968 Master Member Last Online: Jul 27th, 2020 23:19 Join Date: Aug 2015 Location: Chatham	Managed to have a quick look this evening & it is indeed in the location you described It's a metal box with louvres. Thanks again __________________ 2008 C70 D5 SE Lux Nav Geartronic

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