I have a 06 S40 t5 and my low beams have been acting up for awhile now.The car was in an accident on the front passenger side I had it repaired and the light assembly was replaced w a used one and worked fine.......for awhile. Then after about 2 months the drivers side would fail intermittently at start up. After about a month of this the passenger side went out completely. I have since replaced the bulb but it has since never came on. Also since this problem arose I have been experiencing some intermittent engine problems where the turbo spools harder than usual and then stops and there is a vibration underneath the car. My cousin who is a genius w AWD turbo eclipses says its probably a misfire. I honestly dont know but am convinced it has something to do with the lights/ballast /harness I could REALLY USE SOME HELP WITH THIS!!!!! I live in Chicago right next to where a lot of people street race and the cops F*@k with me constantly and I need to get this resolved ASAP! I figure I should test the harness at the lights first and go from there but I dont have a diagram. If anyone has any ideas or, if anyone can get me a wiring diagram that would be awesome thx

 

Not sure about your turbo, but the lights have fuses. I was in an accident and the short with the bulb blew the fuse. Check those first. Also, you may have fried the cpu, which is what happened to me. I took it to an electrical specialist and that is what they diagnosed and the problem has never come back. Cost $600, but was covered because it was accident related. The fuse issue could also be if you have installed upgraded HID's or some aftermarket bulbs that may be drawing too much and the fuse pops. Try upgrading the fuse from 10 or 15 which they probably are to 5 more, so 15 or 20 depending. Good luck and keep us posted.