Just wanted to say many thanks for this. This fix worked great. As you said did struggle with the security bolt but as you said I stuck with it and it did finally loosen up. Used a hacksaw to separate the alarm and with careful use that worked perfectly and gave a neat job. Thanks again. Mike

This happened to me about a week ago. Thanks for the information. Great video. This saved me a lot of time, troubleshooting and effort.

well done i have just bought a 07 v70 and this has happened after 1 month so this video is brilliant for the novice as are your others i have viewed many thanks for all your time and effort

Brilliant video my daughters just bought the Volvo and there it was the warning light, looks a nice easy fix thanks very much for the information. Jim

I've just replaced the battery inside my 2006 XC70 alarm unit and this video was helpful - thanks SiRobb. A few quick points that might ease things for others: 1. Replacement battery pack: I searched on-line and found Varta 6/V250H (7.2V 250mA) mentioned as a direct replacement for my car. That information was correct and I bought that pack, which was the same manufacture and, more important, same size as the one removed. I used a modelling knife to remove the terminal connectors for the wiring from the original battery and then cleaned them up before soldering to the new battery. 2. To split open the original casing I decided not to use a Dremel (even with a plastic cutting disc) or a Stanley knife. Instead I used a modelling knife. First, I sanded down the seam between black and grey parts of the casing. Then, I carefully made a few runs around the seam line with a new blade in my knife to give a cut line. Once I had the groove to follow, I cut through the joint in short lengths. There are a couple of locating lugs on the inside of the long sides, which required a slightly deeper cut. This gradual approach provided a clean joint for reassembly. To reassemble I put a few dabs of Superglue around the joint before putting the two halves back together. Although the Superglue wouldn't be any good to reseal the whole joint, it does hold the casing together so that 2cm strips of tape (I used Gorilla tape) can be run around the outside of the seam. 3. The original battery holder had to be 'opened' to get the battery out. I did this by drilling through the grey plastic rivets at one end with a 3mm drill - I drilled right through the casing - and then breaking the joint between the casing and holder. The top strap of the holder is flexible and I could ease the battery out quite easily. After the new battery was installed, I used small round-head self-tappers with a bit of Araldite on the threads to resecure the holder strap to the casing. (The self-tapers were screwed through from the outside of the casing and into the holes drilled in the holder strap).

I've read about this procedure, but this is the first video I've found that details the complete repair. You did a great job explaining each step of the process, including the pitfalls. I'm fortunate that I have all of the tools on hand (including a Dremel and a hot glue gun.) Now I just have to catch a nice day and get dirty. Thanks for taking the time to put this together.

Very usefull advice to change batteries ASAP before the batteries spoil the circuit board.. Thaank you very much, good job

every online video should be as detailed as this! thanks!!

Dzięki za poświęcony czas, dobra robota. Dzięki tobie naprawiłem szyber dach. Syrena alarmu do wyrzucenia, akumulatorek eksplodował, płytka zalana kwasem, złom. Ale szyber działa , big thanks for you.

My board was still in good shape. I replaced the battery & everything works again. Thanks for the video!

Great Video SiRobb- thank you for posting it.

Just another comment to say thank you. I've just completed this job after watching your video (although I replaced the alarm with a new one, rather than trying to repair the old). Alarm message now gone, sunroof working again, no need for any other magic to make this work. That security bolt is the only hard bit, but a did get it off by dremmeling a slot and using a screwdriver. Thanks for sharing!

This has been an awesome video! Thank you bro, seriously!

Decent video of the battery replacement, well done sir !

Thank you Simon I have just done mine and your video was very helpful .My board luckily was ok as the battery had only recently started to leak. Old battery was putting out 1.6volts after 21 years quite suprising .

Very, very well done. Thank you for posting this excellent instructional video.

really very good - well done for all the detail

very very helpful vid mate , thanks for taking the time to share it with us

Excellent video & very useful, thanks

Great step by step video i shall be attempting this weekend Great work!!

Thank you! Great narration and information.

Fantastic repair video. Thank you

Thanks a lot, I will try your suggestion.

Good video - many thanks......just got to wait for it to warm up a bit outside before I get started. Cheers.

Thank you.Did mine!s60 d5 2005!

Nice work , excellent video.

once again mate --- very useful

Awesome video, thank you sirobb.

quite common yes,, the battery last for 10 years depending of climate then it starts drypping acid inside siren,, done 4 volvos now

Sei un vero conoscitore gerardo

thank you for this video. a lot of Volvo owners are happy today, because maybe most alarms will be working again, and also getting rid of that stupid pesty alarm system service light required to shut off. I own two Volvos, so I have to do this on both of these

Most informative many thanks.

My board was pristine when I stripped it. Thought great I'm on to a winner. Fit new battery, took the time to melt the plastic back together so it was almost as new. Put it back together and hey presto exactly the same as before I touched it. It's not that hard to remove but the next time I'm just going to buy a new one. I can't be doing with the messing about. Just my luck.

Thank for lesson,-tomorrow I'll do the same with my XC-70, because message "alarm system service req appear"/ With this video it will much easy

thank you so much for this video it is so helpful

Great info. Helps to know what the unit is and where it is. Only problem I had is that I couldn't find "7.2v door bell battery" . But after cursing at the computer for 40min. I found it. I found it under "7.2v 320mA car alarm battery" and the only search result i got "Volvo alarm battery 7.2v 330mA". So Now when that comes in I'll see how bad is my circuit board after 21 years of it's life

Thank you, buddy!

really helpful. Many thanks

Opened it up just to find out that the battery leaked. The board basically started to melt but the connections seemed intact so I decided to clean the board thoroughly with loads of contact cleaner, I've put a £5 RC car battery in and voila! To my surprise it's been absolutely fine for more than 3 weeks already. Well chuffed with that but I keep in mind that it might die in the future due to that leak. But happy for now :)

Excellent video. Everything described in good detail for numpties like me. I wouldn't try to do this job at ground level, though - not with my back. I'll show the video to my mechanic and pay him the 2/6d labour to do it. How much to fit a car-lift in my garage?

Thanks, will have to try this on my 2004 XC90

Great video, i have the same issue, but now i know how to fix it :-) Thx very much !

Thankyou great video

Nice work. Thanks.

Great vid mate

Car running fine I wasnt sure if the siren unit imobillised the vehicle. Quite a lot of electronic components just to make a noise! On further inspection ( with specs on) the board is us so it will be a trip to the breakers. Thanks again for your help

Always great informative videos, thank you. My alarm siren has been opened, carefully but getting the six pack varta batteries for the module has been a problem...any advice would be most helpful. Regards,

Great work. Have you disconnected the car battery first?

Merci beaucoup

great video, very helpful, same for S80 MK-II?

jiggery-pokery, I love the British, they are true masters of the English language

thanks a LOT

My inner wing is held on by Torx screws - no drilling required with easy re-assembly. 2003 S60 D5

Thanks for sharing this video! Could you please also tell what the replacement batteries are called, and size, etc. Need to know what to search for.

Yep that's the way to fix it . . just a note on attaching plastic case back together I and others use HOT GLUE GUN as this stops water ingress but good video

save the drilled out heads from the old rivets and put them on the new ones then you can use normal rivets.

Out of curiosity, did you happen to know what type of security bolt that was, or the correct size of the rivets? I don't mind drilling a flat head slot into the security bolt, but I am a little worried I may damage it in the process. Also saving me a trip looking for rivets would be good, although I will most likely replace those with screws to be honest.

A nickel metal hydride battery, abbreviated NiMH or Ni-MH, is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel-cadmium cell (NiCd), with both using nickel oxide hydroxide (NiOOH). see at 8.01 on the side of the battery.

I haven't had to do this surgery yet (and I refer to it as surgery early in this discussion for a reason) and continue to be astounded at poor packaging practices by many manufacturers. In your opinion, is there the option of simply drilling a hole and pull out the wires using a crochet hood (like they did to my vas deferens - and yes it hurt) to interrupt the wires to attach an external battery pack? It would entail less disassembly and easier to replace the battery in the next 10 years.

very good vid SiRobb. May sound like a stupid quiestion but what triggered you knowing you had a bad alarm? Other day my horn went off for no reason when inside the house and blew for 5 minutes till seemingly the fuse blew ( before i could find the book telling me which fuse to pull to stop it ) I have no horn now and it blew another fuse when i put another in. Is the horn unit one in the same as the security alarm or are they 2 seperate units? If one in the same does horn going off on its own consistent with haveing a bad unit ( horn or siren or one-in-the same). Thanks for another good vid

Thank for posting this very informative video, well done! My alarm service warning has been on for many years on my 2003 S80. Do you have any idea whether or not it will affect the sunroof or remote key fobs ultimately? Thanks again!

Nice one ☝️

If you do make a mess of cutting Parts like this open you can quite easily repair them I think using a 3d printer pen and gentle use of a low temp soldering iron can restore the casing appearance. I think most are made of ABS aren't they?.

thanks this was great... I now know how to fix mine,,, do you know how to disable the day time running lights on a 2004 v70 please thanks

Great video...Thank you. My box holding the siren was under my windscreen wipers on my c30 as a matter of interest. Lastly, does your warning light go off automatically once you have replaced everything or do you have to reset the warning message if that makes sense. Many thanks

Great video & easy to follow. I bought a standard alarm battery on fleabay for £12 (bargain) first before stripping out old unit. Great idea, but when I cut the old module open it was shot - the acid had rotted the connection pins. Am now trying to figure out if I can simply remove it altogether. It's a 2003 xc70, so not worth nicking.

Hi on My 2002 Volvo v70 my Alarm siren circuit board was Black and completely covered in battery acid I tried wiring 6 AA Battery,s to the Alarm to see if it would work and it didn't work so i got a Used Alarm siren that worked and I recently fitted after having Alarm system service required for 8 Years I finally found a siren and the Used alarm siren works and there is no Alarm system service required on the dash and when I installed the alarm I did a configuration of the siren unit on Vida for the siren to work properly Take care

is the Volvo fitted battery pack a rechargeable type or are these alkaline batteries?

Excellent video. I'm gonna tackle this project soon. Quick question though: Why does the alarm sound when you open the door with the key? Never knew it did that. Doesn't seem to make sense? Without the key I get it, but why does the car freak out when it is unlocked with the proper key?

Could a siren fault also cause a heavy (540mA) load on the battery?

Brilliant, will be doing mine ASAP. How difficult is it to do the oil pump seals on the 2.4 V70 (170bhp model))?

I always wanted to get rid of the alarm warning but now I know how much work it is I will accept it irritating me. I originally am from Congleton and my recorded voice sounds very much like yours

ANYONE HAVE A LINK WHERE TO BUY THESE ON EBAY? THANK YOU

Hi like the video but can you help me with my car . The car I have is the older model year 2000 do you know if the same alarm siren is on this model and is it fitted in the same place ? Any information about this I would be very grateful for . Thank you very much. Alan 😎

Is there always an error-message on the display when the siren-battery must be replaced ? I have problems with false alarms. I have a S80 T6, from 1999.

Hi SiRobb. Thanks for the video. I was wondering what would happen if you had cleaned your old board. Do you think that would solved the problem? (besides replacing the batteries). Thanks!

If i do not have a alarm on my volvo, can i somehow make it work? Aaaand, do you have any experience in clockspring repairs?

I recently acquired a 2004 xc70 ..like the car - but this "alarm service warning" has been on and my mechanic told me to ignore it. However, 2-3 times in the past 2 months i've had issues with starting it up and needed a jump. I think the main battery is fine - could this issue be draining the main battery? If so, would it help to get a brand new strong battery ? or can I just take out the fuse so it doesn't drain. I'm nor concerned with the alarm system - the vehicle is 18 years old... thanks.

you have great videos! how do you know all this stuff?

As he said, the security bolt isn’t very right. My 16yr old bolt actually came out with a set of vice grips.

Hi great video have the alarm off my 2004 XC90 unfortunately circuit board has some acid damage! do you know if the car still runs without the siren I have tried the central locking etc all still working the only thing not working is the door warning the red alarm flashing light is also still working. Thanks Brian

Very good video. I was wondering if the siren module can be tested before installing it back on the car?

Wouldn't happen to have a link for the battery?

My idea is to find a cell phone charger feed it from the car battery then I think I it will be a long time solution but I will do some experiment first the cell phone charger is usually low voltage I think it could work.

Hi. I did this job on my XC90. The alarm service light went off. But now if I lock and unlock the doors then turn the key it comes back on. But if I then take the key out and back in again it stays off untill I lock it again. Super confused

Great job in using existing parts and not buying new. A rechargeable battery would be great to avoid this problem....hey volvo are you listening? Stay green, recycle and sustain resources.

Hello, I have seen your videos and I have the following question. on my C70 2012 Volvo, it's got those RFID-enabled door handles which means if the original key is near the door handle, then, either pressing the button, or pulling the handle, should automatically unlock the doors in case they are locked. Also, if you intend to lock the doors, pressing the black door handle button with the KEY nearby should also allow the doors to react and lock. After getting a paint job, I noticed that the right-door stopped reacting to this function. Only the trunk and the driver's door react correctly. Being from the technology side, I feel there is some RFID sensor that is either malfunctioning or missing for it NOT to sense that the KEY is within 30 cm outside the lock for it not to react. Pressing the lock/unlock on the remote control makes all doors react correctly. Do you have an idea how I can solve this problem?

Just got a 2005 volvo v70 and it has the same message and triangle light. What does the triangle light mean? Thanks

My alarm was triggering all sort of errors.removed the whole unit. Only alarm error comes up at the start.car stopped playong up.starts and drives

Thanks for the video. How did you remove the original security screw/bolt? also, what screw did you use when you put it back? I would think its not necessary to use a security type screw as long as you can match the thread. What do you think? Also, how did you secure the new battery?

I dont know if it was an error, but in my v70 it said that, and i locked the car then opened it with the key, the alarm went off, i entered back in and the warning went...

Hi Rob, could you advise on what size rivets you eventually used that fit OK? Cheers. Namo Amituofo

Hi is this located on the passenger side of a right hand drive v60

7.2v NiMH 0.32Ah or 320mAh

Any immobilizer dash message tips? Hit a curb with R front tire, broke control arm and axle and bent subframe. Dash airbag went off (no passenger in seat) and driver seatbelt tensioner fired. Replaced both front impact sensors, driver seat belt tensioner, dash airbag. Used an Autophix ES610 scan tool to reset faults. Car still won't start, immobilizer and security system service require dash messages. SRS Control module might need reprogrammed even though the scanner doesn't have any SRS faults. I thought I had a problem before with starting and some single wire on starter having corrosion? 2004 Volvo XC70 wagon. in PA , USA.

Is it a serious problem that needs to be fixed? Or can I leave it like this? please help

OK, how does this alternative sound? Instead of replacing the original battery and then entombing it like the old one, just don't install one. Make the battery supply easily replaceable, as this will happen again and again. Solder some long leads to the correct battery terminals on the siren printed circuit board, mark the polarity, drill a hole in the siren's case, seal with RTV and lead the wires to a battery pack installed in the engine bay; five or six alkaline AA cells should do it. The cost should be about $15, depending on where you buy the parts.

Hi. Thanks for your great videos. I got one question about alarm system message. It is possible to drive with that error or not? That error coming sometimes.

I'm having the same message on my S80 '98 and a problem, where the car remote keys don't work at all(even after changing batteries). do you thing the problem would be in this module?

I did the same thing,I was able to remove it but unfortunately the battery acid has already eaten up the circuit (panel ) I guess is too late 😓😡