Question about Volvo S80

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I have a 2000 s80 volvo, the alarm went off recently with no reason. what is wrong? How can I fix it? Thank you!

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  • lchu25 Jul 18, 2009

    can you give me more details where and how can I check the wire?

  • lchu25 Jul 18, 2009

    can you give me more details where and how can I check the wire?

  • lchu25 Jul 18, 2009

    I disconnect the cable from batter ( negtive first, then positive) , wait about 5 minutes, the connect (positive first), remote lock the car, alarm went off agian with no reason.

    One thing, I notice is that I cannot close the sunroof.

  • lchu25 Jul 19, 2009

    The alarm went off after awhile when I connected the battery on. There are some dicussion online about the alarm battery is out, since the alarm battery is used to control the sun roof, the low battery is caused the alarm went off, too. Do you know where and how can I replace the alarm battery



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The easiest way and the first thing to try is to disconnect the battery for 30 seconds or more. Make sure you have the radio code! You will need to put the code into the stereo. Hook the battery back up, the alarm may go off when you hook the battery back up. If it does, start the car with the chipped key, or disarm it with the key faub. Doing this will reset the whole system, and whatever reason it went off in the first place should be resolved.

Posted on Jul 18, 2009

  • Michael Moore Jul 18, 2009

    The alarm will go off when the battery gets reconnected. I'm sure that the sunroof issue and alarm are not related. After the alarm initially goes off after you connect the battery, reset it and it goes off again?

  • Michael Moore Jul 19, 2009

    The battery pack consists of 4 Ni-cad batteries. The life is approx 8 years. Take off either the drivers side front indicator, you should be able to see it. There should be 5 pop rivets that attach the plastic inner wheel well liner to the wheel arch and bumper. This has to be released to allow access to the siren. There should be two 10mm bolts holding the siren to the inner wing, release the electrical plug connector, undo two more bolts which hold the mounting bracket in place and four screws. Take off the lid for the siren unit and replace the battery. Refitting is exactly the reverse of removal. An absolute piece of cake and everything is working again. That's what should fix the battery issue if it is that. A little complicated but probably cheaper than taking it to the dealer. Hope it helps.


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Hi there,

First of all you need to check all the wires connected to the Alarm system.
must be some wire get loose....

Good Luck!!


Posted on Jul 18, 2009


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