2001 S80 T6 Siren Module 9452709 Replacement/Repair - How To Topic is solved

[cn90]

I am now wondering if it is better to run the 2 wires to engine compartment and keep the 7.2V battery there.
It makes replacing the battery a snap.

[cn90]

I posted update on ebay battery ($10.95) in S60 forum as below...

NO need to drill the rivets or play with the security bolt if you remove the right HL assembly, it is much easier this way!

viewtopic.php?p=600337

[cn90]

- Before: "Alarm System Service Required"
- Changed the alarm siren Battery using info in this forum 7.2V, 320mAh Ni-MH type. I did not disconnect the battery in the trunk.
- After: yesterday was OK, but today, it is a different message "Alarm Triggered, Check Car". Does anyone know what this means and how do I reset this message?

PS: I have DICE and VIDA laptop...

[cn90]

According to this youtube video, if you see message "Alarm Triggered, Check Car", then lock/unlock the car 3 times, this should get rid of this message...

[packetfire]

The alarm module is perhaps more easily removed by removal of the passenger-side headlight assembly (which requires partial removal of the front bumper-cover plastic and the plastic bracket with the tightening clamp that tightens up the bumper cover to get at the 10mm bolt that holds the headlight at the corner of the headlight assembly furthest from the radiator.

Complete removal of the alarm module did NOT harm sunroof operation on a 2004 v70, but this may be year/model specific, given the large number of anecdotes that removal does disable the sunroof. Once replaced with a new battery, I continue to get random "alarm triggered" messages, and neighbors will find the car sitting in the drive, flashing its emergency flashers, but I unplugged the siren, so the car is at least silent.

I guess I need to verify each door's sensor for "locked" and the tilt sensor. Are these something that can be read with VIDA? I sure hope so!

[Simayy]

I want to add my experience. I had UEM error sunroof communication fault. No error codes related to siren but it has never gone off and the light does not blink when locked. I've had my mechanic replace it with a siren I found for 25 euros at the scrapyard, and supplied him with the 6 rivets (4 and 2, search for mudflaps) for the RH F wheelwell front mudflap. After this I locked/unlocked through keyhole three times to reset the UEM. Immediately after that the sunroof started working again. The siren does not yet seem to work, perhaps it has been coded removed, I do not care at this time as there are much nicer cars around. Great and cheap fix, total cost 100 euros.

[wch2032]

Recently my alarm module went out. I went and pulled 5 siren units at the junkyard and only found one with a good PCB, everything else had bad corrosion on the boards. The one in my own vehicle had a mostly good board except for one corner where the PCB mask was corroding off. This is such a bad design but at least parts are plentiful. I've relocated my battery to the ECU box, but I don't see myself using this car longer than I expect the battery to last

Removing the bumper is the way to go. Lifting the car is always a pain

How are people sealing the alarm module boxes?

[Cees Klumper]

When I bought our 2002 T6, in 2010 with only 40K miles, it had the "alarm system service required" warning (in French, this was in Geneva) upon startup. A few years later, maybe 2015, I bit the bullet and for something like $150 bought a brand new Volvo siren and installation kit from Skandix in Germany. Installation took maybe 2 hours and it's been perfect since. Don't know whether Skandix still sells the kit.

Had a similar issue on a 2008 C70 that destroyed batteries due to a defective alarm module. Replaced that also with a new one and problem was solved.