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  1. #1
    Join Date
    Jan 2018
    Location
    Grand Rapids, MI
    Posts
    64

    Default Siren Replacement

    Hello all. I think my siren needs to be replaced (or disabled). My sunroof started not working, After reading up I checked Fuse #38 wich controls the siren. It is blown. I replaced it and it blew again. After reading forums and Youtube, it looks like these sirens go bad when the batteries inside leak and fry the board. At least I'm hoping thats the issue.

    Before buying a new one I was wondering if anyone has a spare they kept after replacing theirs that I can have. I might tinker with it replace the battery.

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

    https://www.youtube.com/watch?v=qbaT6fAS6pM

    Thanks.
    IF IT AIN'T BROKE - DON'T FIX IT!
    04 Volvo XC70 5LT 120k "Floatey" Ruby Red, Valvoline 0W40
    07 Honda Accord V6 115k Silver, Napa 5W20 Blend
    07 Honda Accord L4 110k Bronze, Napa 5W20 Blend
    96 MB C220 L4 330k, 20W40

  2. #2
    Join Date
    Nov 2018
    Location
    CT
    Posts
    65

    Default

    I just replaced mine which unfortunately had leaked so I tossed it. That said, I replaced mine with one from Eerie VoVo (check out their EBay store), replaced that used battery with a new one.

    I spent only $45 on the siren itself.

  3. #3
    Join Date
    Jan 2018
    Location
    Grand Rapids, MI
    Posts
    64

    Default

    Quote Originally Posted by NTXC View Post
    I just replaced mine which unfortunately had leaked so I tossed it. That said, I replaced mine with one from Eerie VoVo (check out their EBay store), replaced that used battery with a new one.

    I spent only $45 on the siren itself.
    I spoke with them the other day. They want $90 for the siren. Maybe its cheaper in their ebay store? There's also an eBay seller (laautoparts) that sells rebuilt units. Battery replaced for $139.

    I just don't want the hassle of replacing the siren again.
    IF IT AIN'T BROKE - DON'T FIX IT!
    04 Volvo XC70 5LT 120k "Floatey" Ruby Red, Valvoline 0W40
    07 Honda Accord V6 115k Silver, Napa 5W20 Blend
    07 Honda Accord L4 110k Bronze, Napa 5W20 Blend
    96 MB C220 L4 330k, 20W40

  4. #4
    Join Date
    Sep 2002
    Location
    Belgium
    Posts
    2,404

    Default

    You can disconnect the siren module. If that solves the problem of the sunroof,
    you know that the siren module is indeed the cause of the problem.
    You don't have to replace the siren module, there will still be some or or all of the
    burglar alarm active, the horn of the car will sound instead of the siren.
    Should you leave it disconnected, pay careful attention to keep the conector
    away from moisture in order not to blow a fuse or compromise the Can-bus.
    144 GL (1974)--->244 GL (1982)--->940 GLE 2.3i (1992)--->XC70 2.5T (2004)--->XC90 T5 (2018)

  5. #5
    Join Date
    Jan 2018
    Location
    Grand Rapids, MI
    Posts
    64

    Default Siren Module

    Quote Originally Posted by Willy View Post
    You can disconnect the siren module. If that solves the problem of the sunroof,
    you know that the siren module is indeed the cause of the problem.
    You don't have to replace the siren module, there will still be some or or all of the
    burglar alarm active, the horn of the car will sound instead of the siren.
    Should you leave it disconnected, pay careful attention to keep the conector
    away from moisture in order not to blow a fuse or compromise the Can-bus.
    Thanks. Where Is the siren module located? When you say module you mean the siren unit? Are you saying that disconnecting or unplugging the unit should make the sunroof work again?

    And not quite sure what you are saying that there will still be a burglar alarm active with the horn sounding instead.
    IF IT AIN'T BROKE - DON'T FIX IT!
    04 Volvo XC70 5LT 120k "Floatey" Ruby Red, Valvoline 0W40
    07 Honda Accord V6 115k Silver, Napa 5W20 Blend
    07 Honda Accord L4 110k Bronze, Napa 5W20 Blend
    96 MB C220 L4 330k, 20W40

  6. #6
    Join Date
    Sep 2002
    Location
    Belgium
    Posts
    2,404

    Default

    The siren module is not just a loud horn, it is a CAN-bus member and as such contains electronics.
    Some suffer from leaking batteries, mine had water damage. The module is located in the right
    front wheel well, behind the liner. It is fixed with a tamper-proof bolt, but this bolt can be removed
    by making flat sides to it (eg with a Dremel tool) so it can be gripped. You can use a normal bolt
    if you replace the module. Disconnecting the siren module could make the sunroof work again, it
    may depend on the specific cause of the problem.
    As I found out while the siren module in our XC70 was removed, the horn of the car takes over
    (at least for a number of alarm causes) the function of the siren if it isn't present.
    There is a lot of info about the siren module on this forum. If you do a search for "siren module"
    you will get a long list of hits. After reading them you will be quite knowledgeable about this topic.
    144 GL (1974)--->244 GL (1982)--->940 GLE 2.3i (1992)--->XC70 2.5T (2004)--->XC90 T5 (2018)

  7. #7
    Join Date
    Jan 2018
    Location
    Grand Rapids, MI
    Posts
    64

    Default

    Thanks again. Good to know that it appears the horn takes over. Which begs the question why didn't Volvo just resort to using the horn for the alarm instead of introducing another contraption.

    I am looking at three ways to go about this. One, remove and open the module and see if the board is ok. If ok replace battery. Two, get the $138 eBay unit whose battery supposedly has been replaced. Three, get a used module from Erie Volvo for $90. Four, buy a new one for $253 from FCP.
    IF IT AIN'T BROKE - DON'T FIX IT!
    04 Volvo XC70 5LT 120k "Floatey" Ruby Red, Valvoline 0W40
    07 Honda Accord V6 115k Silver, Napa 5W20 Blend
    07 Honda Accord L4 110k Bronze, Napa 5W20 Blend
    96 MB C220 L4 330k, 20W40

  8. #8
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
    Posts
    513

    Default

    When i removed my alarm module to replace the internal battery the horn did not take over the function of the alarm, maybe my car is faulty?.
    Current Junk: Couple of worthless rusty old clapped out Volvo bricks, XC70's 02, 04 & Countless P.O.S's, Rust buckets, Junk cars,( 50W Oily cesspool Sludge) Stolen and other assorted rubbish cars, 1928 Jed Clampett Tourer, (8 hole cast iron lump, original rust and decay, 40W Straight Bacon Grease),

  9. #9
    Join Date
    Sep 2002
    Location
    Belgium
    Posts
    2,404

    Default

    If I remember well, the horn only sounded for a number of alarm situations, but I can't remember which. I do know I did some tests, possibly the horn sounded when I put my arm in through the open window and tripped the interior motion sensor. But I can't be sure about this, it's a very long time ago. Perhaps Volvo decided on the siren module since it is a stand alone unit with its own battery.
    144 GL (1974)--->244 GL (1982)--->940 GLE 2.3i (1992)--->XC70 2.5T (2004)--->XC90 T5 (2018)

  10. #10
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
    Posts
    513

    Default

    Interior motion sensor?, both my XC's do not have that option as i can set the alarm while inside and nothing happens if i move around, only if i open a door it triggers.
    Current Junk: Couple of worthless rusty old clapped out Volvo bricks, XC70's 02, 04 & Countless P.O.S's, Rust buckets, Junk cars,( 50W Oily cesspool Sludge) Stolen and other assorted rubbish cars, 1928 Jed Clampett Tourer, (8 hole cast iron lump, original rust and decay, 40W Straight Bacon Grease),

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