Question about 2004 Volvo XC90

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Siren unit tests out bad on the diagnostics test for my 2004 Volvol XC90 alarm system module. Can I just by a bypass unit and install it, or pull a fuse to deactivate it?

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You could do both but you might get a code that pops up

Posted on Apr 27, 2011

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Alarm goes off even after unlocking with remote


If the alarm has a siren with a backup battery, then check the condition of the siren battery. Is it drawing a large charge (drop in amps from the battery. Run a parasitic drain test). If so, then the siren could be at fault.

Is the alarm fitted with a sonic motion detector? Looks like two tiny speakers in a unit fitted in the centre of the dash. If so, this unit could be faulty.

Many after market alarm systems by the way, tend to only last for a few short years before failing. Is this an aftermarket product or factory?

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04 volvo xc90 Moonroof will not open. The fuse is good so why will it not open? Also, would this have anything to so with the alarm service notice.


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Jun 11, 2011 | 2004 Volvo XC90

1 Answer

I had my alarm system service required how i know that is the siren? also i have service need i all ready did the service how to reset the it?


The person(s) who serviced your alarm should be able to tell you if you have siren or horn type.. We have NO idea what alarm system you have..Volvo has many alarm systems. Ti reset you service light you need an OBII scanner - You can have any good shop or auto parts store do it for you.

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My 2004 volvo xc90 says alarm system service required. any ideas on how to diagnose or any common problems


I had the same problem on my 04 XC90 - apparently it is a common failure... You need to replace a Siren module.

Oct 09, 2010 | 2004 Volvo XC90

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What does a message alarm system service required means on my 2004 volvo xc90?


It means that the vehicle diagnostic system has detected a faulty alarm component and must be diagnosed and fixed.

At best it just means that your alarm is partially or wholly non-functional, at worst it could activate at random or even cause the immobiliser to play up.

Unless you have specialist skills and tools then it's not really a DIY fix unless the fault is a really obvious one, like a failed door switch.

Sep 30, 2010 | 2004 Volvo XC90

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