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The car can have Bi-Xenons or halogens lamps, the bulb would be different. The user manual shows which bulb type to use.
Changing the halogen bulb would be quite easy. On the contrary changing Xenon HID's involves some knowhow and should be done by a dealer, they also need to be replaced in pairs.
On the back of the headlight where the wires enter, you should be able to twist and remove the lamp holder. Be careful with the new bulb if it is halogen, do not touch the bulb!!
This guys don't know what they are talking about. If you have self leveling head lights and they are way out of alignment, yes there is adjustment screws but those mess with a different light bulb (daytime running light) instead of the main bulb alignment.
So what is a man to do? go to the dealer and have them adjust them for you. Believe it or not everytime you get an aliment done you have to recalibrate your headlights because they change the way the vehicle sits. Do it enough times and the headlight will go out of wack (because of the self leveling function)
In other words, they headlights are adjusted by means of a Computer. You could do it your self but you have to buy the DICE VIDA adjustment tool and the proper software from Volvo. Not cheap, just go to the dealership.
I assume it didn't work before you changed the bulb either. You'll have to check for voltage at the bulb socket when the low beam headlights are turned on. If there is none you'll have to trace the wire back to where it splits from the right low beam headlight. If there is voltage there you have a problem with the new bulb.
Did you swap in HID bulbs into a halogen headlight assembly? If so, this is precisely why it's *******--they actually cast LESS light on the road. See this post on HID. Headlight replacement cost Ricks Free Auto Repair Advice
Don't change to HID Xenon or Bi-Xenon unless you change the entire headlight unit, as your standard headlamp units are not designed for this. You will only end up blinding oncoming traffic, and your beam scatter will be all over the place.
Take your car to a servicing garage or dealer and ask them to check the headlight alignment. If you are still unhappy with the headlight performance, there are plenty of quality halogen bulbs out there - just look at the Philips or Osram automotive range.
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