Are there any common issues with the S60 such as faulty door or trunk switches that would cause the battery to drain? The battery is completely dead and was purchased new only two years ago.
In one of my other cars it was common for the trunk switch to fail and the trunk lights would stay on and draw power after the car was shut off. I'm looking for the common places to start diagnosing as we aren't too familiar yet with Volvo's.
Thanks.

 

Which year?
Check through the fold down seat?
The overhead personal map light to the passenger?
My 2012 seems to shut everything off always.

 

2001 S60
The trunk lights are functioning properly and turn off when it's closed. None of the interior lights are staying on either. I was hoping it would be a simple interior lamp staying on for some reason but there's something else drawing power or maybe a failing alternator.
I'll do a more thorough diagnosis starting with the alternator over the weekend, the Volvo isn't a daily driver and I have other projects that need finishing so I'm not in a huge rush to get it done.

 

Only thing I have seen is door modules, but you'll hear them clicking when the car is off. Have you measured the drain?

 

Checked the glove box internal light?

 

Over simple answer is one cell of the battery has gone bad. At two years old this is high probability.


I think Auto Zone has a load tester for free. Maybe Sears, too.

 

I jump started the car a couple days ago, it's been fine thus far. If the battery dies again within a few days then I'll check everything again and re-diagnose. Three of us drive the car, I think someone may have simply left the headlights on.