For the past week we've been getting "alarm triggered, check car". The alarm never sounds but the LED on the dash is blinking furiously. Anybody ever experienced this and know a solution.

Thanks

Just out of curiosity, have you tried closing the hood firmly? Sometimes, if the hood does not make good contact with the sensor on the driver's side, the security system cannot close the loop.

Klaus
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Proud owner of a 1967 220S. If I had more room, I would have more Volvos.

Tried your suggestion but didn't help.
Thanks

I had the same problem plus the right front door unlocked at will.

The siren mod. is in the right front fender(Mathewsvolvosite). The batteries leak at about seven or eight years. Remove the plastic wheel well lining and look forward. You will see a metal bracket with a box inside that is 3 x 4 inches. See the mounting bolt, it is a one way smooth head. Raise the hood and find the threaded end. I used channel lock pliers to turn the nut from the eng. compartment. I then unpluged the siren and opened it. The batteries has just started to leak and a small portion of the board was affected. The good news: when the siren was unpluged. my problems went away. The new part is about $175.

I removed the batteries, cleaned the board and reinstalled the unit using a 10mm bolt to hold the bracket in place. every thing works fine.

I also needed to remove the door panel on the passenger door and clean the linage and switches with WD-40. The micro switch was the second problem.

I understand from the Matthews volvo site that the 7.2v memory battery in the siren will cause a great deal of damage to the board and cause problems with the power windows, sunroof, etc.
I think unpluging the siren and seeing if your problem goes away is the simple soln. Who is going to steal an 8 year old volvo wagon! Besides the transponder in the key is the best insurnace.

I hope this helps.

Thanks TC

Followed your advice, then tried other tests like arming the car with the window down then reaching in a opening the door, result no alarm. Also had issues with sunroof not working then 15 minutes later would work fine. I've purchased a new siren mod and will put it in shortly.

Hello, My 2002 V70 has developed a quirk. Twice, while in "auto up" mode, the LF window has reversed direction (gone down on its own). This thread regarding the alarm system's leaking battery affecting window and sunroof action is very interesting. I can make efficient use of my time while installing my mud flaps. At the LF corner I will find the alarm box. Special thanks go to Volvo/Ford for using sheet metal screws in an exterior location. At the RR I will search for a cracked piece of plastic which is causing my P0442 code. Kira

You can get the instructions to change this right from Volvo. Don't be fooled by the instructions on Mathews site, that is for an S80. For the V70 like ours you have to remove the front bumper and I believe the right headlight. I still haven't gotten around to change mine, I will try an post the link to change this from Volvo tomorrow.

Link to install directions from Volvo
http://vccs.volvocars.se/accessories/ii/Details.aspx?uid=6254cf10-0038-4f83-949e-2ff5e49afa6b