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Discussion Starter · #1 ·
The car behind my question is a 1999 S80 2.4 but I believe the root problem affects all P2 platform Volvos.

The backup batteries in the anti-theft alarm have a finite life. When the end of their life is approached they fail to take a charge with the consequence that the main car battery becomes flat due to a continuous attempt to recharge the alarm battery when the car is parked up for an extended period.

The problem is that the alarm sounder is a sealed unit that also includes the battery. Volvo "repair" is to replace the entire unit at £££s ( or $$$s no doubt too
)

Is there a known hack to take the unit apart and replace with an equivalent consumer battery, please? I don't want to buy a second hand unit and then have that fail too.

TVM.
 

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2021 Volvo S60 T5 FWD
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I was going to try to find that for you
My car has the same problem...

For others stopping by: (from what I remember) the consensus seems to be that the battery leaks and destroys and whole circuit board, so you need to buy a whole new unit, but it apparently doesn't need to be initiated by the dealer http://********************/smile/emthup.gif
 
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