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Car alarm randomly going off on hot days

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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Car alarm randomly going off on hot days

Post by benpineapple » Tue Aug 20, 2019 12:59 pm

Hello! Random odd issue with my '06 V50, which has been progressively getting worse. The car alarm keeps randomly going off, I've noticed typically on hot days when the car is parked in the sun. It's the chime/whistle alarm, not the alarm that also has the horn honking.

My issue is similar to this thread: https://forums.swedespeed.com/showthrea ... e-Required But it is unclear to me if I need to replace an alarm unit, or if it is possible to replace batteries? Seems like people are saying not all alarm units are serviceable.

Has anyone had this issue? How were you able to resolve the issue?

2006 V50 T5
2001 V70 X/C AWD

1998 V70 AWD [RIP at 249,255M]
1990 240 [SOLD at 220xxxM]

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Re: Car alarm randomly going off on hot days

Post by theWIFES_S70 » Sun Sep 01, 2019 9:32 pm

Ben, have you been able to figure this out? What a Gremlin... I imagine it's a ground wire somewhere or a battery issue. The heat gives me pause though... why (or how!) would heat play a role here...
1998 Volvo S70, N/A, 5-speed, 185K
2007 Volvo S40, 2.4i, 5-speed, 99K

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