Hello,
How are you? I have a 2005 Volvo S40 that has had one replacement battery after the initial OEM failed due to drainage. Now, the new battery is also suffering the same faith. I have tried to recharge the battery with a deep cycle charger overnight and it would still drain. I have been trying to find some information on the internet about this problem and it I found one resource that indicated that the INFOTAINMENT system is not shutting down properly and that it needs to have a VADIS update to stop the INFOTAINMENT from draining the battery. Is there a way for me to do this without the dealer since the car is out of warranty.
Thanks,
JP

What you really need is a multimeter ($25 at autoparts store) and check the battery drain yourself. Then you can verify what circuit is causing the drain by removing 1 fuse at a time and cheking the draw on the battery. That is the only way to do it.
You could make sure the trunk light is turned off by flipping the rear seat forward.

To get the battery to charge fully, remove the negative cable when you get home and hook up the trickle charger.

Klaus
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Volvoless. Sold the R. There is now a void...

If I find the fuse that is associated with a drain, what do I do? Let's say for instance that it is the Infotainment system, how do I fix that?
Thanks
JP

Your fuses should only serve a couple of functions, at most. If you find the ingo system is the problem, then you will need to go to a dealer for new software.
At least, by pulling fuses, you will know what circuit the problem is on. That will help a lot. Some cars have a problem where the red door warning lights stay on. Check your car in the dark???

Klaus
--
Volvoless. Sold the R. There is now a void...