V70: Electrical Alarm siren location

[wildrover55]

Afternoon all having trawled through this section I was unable to find a post describing the location of the alarm siren on my 2015 V70 D5 can anybody advise as it has developed a fault and needs replacing.

[ASt85]

I've lifted this from Vida if it is of any help


[/URL][/IMG]

The siren is used as a sound source for the alarm function. The siren is mounted under the cowl. (I think this means the wide plastic cover that covers the wiper motor & etc) From structure week 200946 the siren is fitted in the left-hand wheel housing, above/behind the wheel. The siren is available with or without an internal vehicle tilt sensor. The type of siren mounted in the vehicle is market and customer dependent.

The siren sounds if the power supply is cut or if ground is cut or if communication with the central electronic module (CEM) fails while the alarm is activated. The siren contains an internal battery which is charged when the ignition is on. The battery cannot be replaced by itself.
(I would think that in common with earlier models it is probable that cutting the unit open would allow the battery to be replaced)
The alarm cause can be read from the diagnostic tool. This states what caused the alarm.

If the vehicle is equipped with a siren with a vehicle tilt sensor, the sensor is integrated into the siren. The vehicle tilt sensor reacts to changes in the angle of lean or motion of the vehicle and transmits a signal to the central electronic module (CEM). While the vehicle tilt sensor is mounted in the siren it is counted as a separate unit. If the vehicle tilt sensor indicates that the vehicle is being lifted the central electronic module (CEM) must send an activation signal to the siren. In this case the siren cannot trigger an alarm by itself.

The siren is powered via a fuse from the central electronic module (CEM) The siren is grounded in the engine compartment.

[ASt85]

Attempting to upload a word doc has repeatedly failed - converting to pdf has also failed to upload, so I've pasted the notepad paragraphs below the image above - I hope they are of some help.
NB
I pm'd it to you before it dawned on me I could simply paste the text below the photo...Doh!

[wildrover55]

thanks for that detail will keep me busy tomorrow

[MDSurrey]

Originally Posted by ASt85

I've lifted this from Vida if it is of any help


[/URL][/IMG]

The siren is used as a sound source for the alarm function. The siren is mounted under the cowl. (I think this means the wide plastic cover that covers the wiper motor & etc) From structure week 200946 the siren is fitted in the left-hand wheel housing, above/behind the wheel. The siren is available with or without an internal vehicle tilt sensor. The type of siren mounted in the vehicle is market and customer dependent.

The siren sounds if the power supply is cut or if ground is cut or if communication with the central electronic module (CEM) fails while the alarm is activated. The siren contains an internal battery which is charged when the ignition is on. The battery cannot be replaced by itself.
(I would think that in common with earlier models it is probable that cutting the unit open would allow the battery to be replaced)
The alarm cause can be read from the diagnostic tool. This states what caused the alarm.

If the vehicle is equipped with a siren with a vehicle tilt sensor, the sensor is integrated into the siren. The vehicle tilt sensor reacts to changes in the angle of lean or motion of the vehicle and transmits a signal to the central electronic module (CEM). While the vehicle tilt sensor is mounted in the siren it is counted as a separate unit. If the vehicle tilt sensor indicates that the vehicle is being lifted the central electronic module (CEM) must send an activation signal to the siren. In this case the siren cannot trigger an alarm by itself.

The siren is powered via a fuse from the central electronic module (CEM) The siren is grounded in the engine compartment.

I'm using this information to troubleshoot my 2008 V70. Does this mean the siren can be accessed from under the cowl? Or will the wheel need taking off like in the previous gen? Thank you.

[Stu B]

If it’s the same as my 2009 V70, have a look at post number 66 in my thread here for pics of when I did mine… might help. Watch for sharp edges!

https://www.volvoforums.org.uk/showt...=302878&page=7

[Tatsfield]

There are a whole string of YouTube videos on how to do this job:
https://www.youtube.com/results?sear...y+replacement+

I didn't choose one for you as you can look at all of them to get a flavour of what's involved.

If the failed battery hasn't destroyed the printed circuit board it makes sense to just find a suitable battery on ebay for about £5 and cut open the case and replace the battery, The job uses a craft knife, a soldering iron and some sealant to seal the case closed. I feel that it's a bit reprehensible to force owners to buy expensive electrical units just for the sake of a failed battery which could have been made more easily replaceable by making the case openable and the battery connected rather than soldered. It's a challenge but not a hard one.

[patrocolus]

I realise this is now an old thread, but I’m posting for future reference. Mine is a 2013 model V70. The VIDA diagram is accurate, but perhaps less than helpful. The alarm is mounted at the rear of the wheel arch on the nearside, and is easily reached from underneath once you have removed the liner (half a dozen or so torx screws and 3 10mm plastic nuts.

Of course, I found this out after looking at the front of the offside wheel arch, and then removing the scuttle to see if it was under there! I hope this helps someone!