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Discussion Starter · #1 · (Edited)
Hi all!

Firstly, let me say that I just picked up a clean, one owner MY07 XC90 V8 Sport this weekend from a local Volvo Specialist. I love it. I've done some tinkering with it, including setting up a Thinkware Q800 Pro dash camera.
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Here's where things get interesting. At 1:05am, the alarm triggered by itself, but was easily shut off and re-armed with the key. When the alarm was going off, the red light on the dash was flashing fast. It just blinks every few seconds when armed.

about an hour later at some time around 2:00am, the alarm went off again, and was stopped with the key, except this time the light didn't stop flashing fast until I came out to the car and opened the drivers door.

I have not locked the vehicle for fear of the alarm going off again. I went into my dash camera settings and checked the camera's low voltage cutoff and it was set to 12.1 volts. The readout in the live view says 12.4 volts at this moment (2:28am). I know that the live voltage read outs can be somewhat inaccurate (reading lower than actual voltage). I haven't pulled the battery box cover to see what the battery looks like or if it's actually old, though I would hardly be surprised if it is… especially with the voltage dropping so significantly in a matter of 8 hours.

I've only owned the vehicle for 48 hours, and the dash cam has been wired up and running for less than 1/4 of that time. I have read a few other threads that report that a low battery can trigger the alarm (how pathetic is that???). Owners of these cars seriously have to sacrifice the safety of their vehicle to avoid being woken up at ungodly hours?

I'm really hoping to find some answers here. I can't be having this happen.

Thanks all,

Mike
 

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Maybe start here-

XC90 alarm going off by itself | SwedeSpeed - Volvo Performance Forum

Repeated "Alarm Triggered" warning. | SwedeSpeed - Volvo Performance Forum

XC90 alarm keeps going off intermittently - Volvo Forums - Volvo Enthusiasts Forum

2004 XC90 Alarm - FWD/AWD 1999 - 2010 - Volvospeed Forums

Alarm randomly going off???? | SwedeSpeed - Volvo Performance Forum

Alarm keeps going off!? - Volvo Owners Club Forum (volvoforums.org.uk)

There are lots more, pretty much all pointing to a leaked rechargeable battery in the alarm module causing the siren to go off randomly. Issue is noted across the entire vehicle line, it's not just the XC90 with the complaint.

I replaced the'05 siren module back in 2013, was still working fine when I sold the vehicle in February (see the first thread for details). Some folks have been successful in replacing just the rechargeable battery, I was not as there was too much corrosion on the PCB. Part number reprint from a thread today- Siren module is PN 31110042 for chassis (last 6 of VIN) less than 615814.
For chassis greater than 615815, it's PN 30659886 for siren with level sensor and PN 30659887 for siren without level sensor.

I would absolutely check the vehicle's battery and if it's original (14 years old), a replacement is due. If original it'll be a Volvo part with an installed datecode (WWYY) stamped on the negative terminal.

How many miles on the vehicle and what work was done (especially on engine and suspension) before you took ownership?


Congrats on your "new" purchase.

edit- vehicle battery
 
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Discussion Starter · #3 ·
Thanks for the warm welcome and kind words!

It currently has 212,000kms (131k miles) and runs/drives flawlessly. It was purchased new in West Vancouver BC and has been there its entire life with the same owners. Judging by all the "maintenance service" hits that come up on the carfax report, I am going to cautiously assume that this vehicle has been meticulously maintained since new. It really does look the part, with the exception of typical Vancouver parking lot dings and a few minor scratches. It will probably go for a full paint correction and dent removal this spring.

With regard to the vehicle battery, I haven't checked it as of late. The dealer sold me the car with a 90 day warranty, so I'm going to take advantage of it as much as is possible within reason! I've owned a wide range of vehicles over the last few years and I have every intention of keeping this one for a long time. It's so much fun to drive and just so damn comfortable!

Cheers
 

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I had multiple dead batteries over the years, and never a false alarm. What did happen, though, is the remote wouldn't open the doors when the battery was dead, but opening it with the key would always set the alarm off.
 

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I don't see much of a relationship with a tired battery and a randomly sounding siren as reported over the years but anything is possible. However, if this battery is original, just replace out of principle, it's 14 years old.

If you're concerned about the siren randomly going off, I believe that you can close the sunroof and pull fuse #8 under the driver's footwell cosmetic cover (CEM block). Put the fuse back in once you fix the issue. You can find a soft copy of your owner's manual here- Volvo Car USA Support | Contact us | Help (custhelp.com) , has fuse locations.
 
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