Hello, Im new here and this is post #1. I have a 2005 V70 2.5T with 165K miles. I am the 2nd owner and I purchased the car with 129K. Yesterday I came outside to discover my car would not start due to dead battery. Even more interesting was that the high beams and the driving lights were stuck on. Every few seconds the lights would flash and when I got in the car I could hear a relay clicking sporadically.

The battery was dead so I removed it and took it to the local shop to be tested. Getting the battery out with no power to the tailgate was difficult but I got it. The battery test was good so I charged it up to full on a charger and reinstalled it. The car starts but will not run more than 60 secs. There are no messages from the computer but the red warning light is on when the car is running. And again, when I remove the key the high beams come on and the driving lights flicker and will not shut off.

I removed the fuses for the high beams and they stayed off but I could still hear a relay clicking. The key was out of the ignition. The only way to stop the relay was to disconnect the battery. Any idea where I should look for trouble? Thank u.

 

Start with someone scanning the codes in the central electronics module.

 

Your battery is probably bad. Before throwing $100+ away for a "professional" scan I'd make sure the battery and the charging system are OK. These cars are very voltage sensitive and get all kinds weird symptoms.