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Alarm keeps activating for no reason

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Canadian Moose
Posts: 76
Joined: Mon Sep 05, 2016 7:28 pm
Year and Model: 2002 V70
Location: Canada

Alarm keeps activating for no reason

Post by Canadian Moose »

Got an issue with the alarm on my 2002 V70. Last night I got woken up to the siren. Went outside to check only to discover my car alarm going off for no reason. I turned it off and went back to bed. Tonight same thing happened after work. Alarm went off for no reason.

Any idea what could be causing this or how to diagnose it? I have VIDA DICE unit. Would alarm store any codes?

Alternatively, can I disable the alarm completely? I am not really worried about 600 dollar car getting stolen.
jonesg
Posts: 1152
Joined: Wed Jan 16, 2008 3:25 pm
Year and Model: 2004 V70
Location: Northern maine.
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Re: Alarm keeps activating for no reason

Post by jonesg »

when mine did that I changed the battery in the fob. Fixed it.
Canadian Moose
Posts: 76
Joined: Mon Sep 05, 2016 7:28 pm
Year and Model: 2002 V70
Location: Canada

Re: Alarm keeps activating for no reason

Post by Canadian Moose »

They key fob?
zanzabar
Posts: 240
Joined: Fri May 28, 2010 11:55 pm
Year and Model: '07 V70, '84 245
Location: Petaluma, CA
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Re: Alarm keeps activating for no reason

Post by zanzabar »

Tailgate wiring perhaps? Do the lights stay on inside the car after the doors are shut?
VW TDI refugee
LeMons racer ('84 245)
1994 855 (sold)
2007 V70 2.5T daily driver
Canadian Moose
Posts: 76
Joined: Mon Sep 05, 2016 7:28 pm
Year and Model: 2002 V70
Location: Canada

Re: Alarm keeps activating for no reason

Post by Canadian Moose »

The lights go out.
chisholm
Posts: 17
Joined: Thu Nov 05, 2009 6:23 am
Year and Model: 2016 XC90 2008 S8
Location: Virginia Beach VA

Re: Alarm keeps activating for no reason

Post by chisholm »

In my 2001 v70 and 2004 xc90, had same thing happen in both. Small battery in alarm module leaks (slowly) and triggers alarm. Had module replaced in 2001 for $200+. On the 2004, I was close to 200,000 miles so I took the fuse out and started leaving the keys in the ignition, hoping someone would steal it.
chisholm
Posts: 17
Joined: Thu Nov 05, 2009 6:23 am
Year and Model: 2016 XC90 2008 S8
Location: Virginia Beach VA

Re: Alarm keeps activating for no reason

Post by chisholm »

chisholm wrote:In my 2001 V70 and 2004 XC90, had same thing happen in both. Small battery in alarm module leaks (slowly) and triggers alarm. Had module replaced in 2001 for $200+. On the 2004, I was close to 200,000 miles so I took the fuse out and started leaving the keys in the ignition, hoping someone would steal it.
On the 04, you will retain the message " Alarm service required."
Canadian Moose
Posts: 76
Joined: Mon Sep 05, 2016 7:28 pm
Year and Model: 2002 V70
Location: Canada

Re: Alarm keeps activating for no reason

Post by Canadian Moose »

chisholm wrote:In my 2001 V70 and 2004 XC90, had same thing happen in both. Small battery in alarm module leaks (slowly) and triggers alarm. Had module replaced in 2001 for $200+. On the 2004, I was close to 200,000 miles so I took the fuse out and started leaving the keys in the ignition, hoping someone would steal it.
Whereabouts is the alarm module located? Can the battery be replaced or do you have to replace the whole module? If I were to pull the fuse, does that just disable the siren or the whole alarm system?
IdahoBob
Posts: 96
Joined: Sun Jan 16, 2011 9:33 pm
Year and Model: XC70 02, 04 & 08
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Re: Alarm keeps activating for no reason

Post by IdahoBob »

agree with just pull the fuse for the alarm. You'll still have the blinky light on the dash, just no alarm. problem solved. If someone steals your old volvo, well....that's why you have insurance.

Happy Motoring!
Idaho Bob
67, 71, 85, 98 wagons (sold)
78 coupe (gave to mechanic, thanks!)
02, 04 (X2) & 08 XC70's
before that: 67 Sunbeam, several pre-68 VW's, '41 Buick, '42 Ford Jeep, and some boring stuff
Canadian Moose
Posts: 76
Joined: Mon Sep 05, 2016 7:28 pm
Year and Model: 2002 V70
Location: Canada

Re: Alarm keeps activating for no reason

Post by Canadian Moose »

I ended up pulling the fuse. I might end up replacing the alarm or battery next summer but for now this'll do. Just curious, is it normal for the car to lock the doors by itself after a few minutes?
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