You may want to try a different bulb. There is a chance you bought a dud. Check for power with a test light. If no power keep checking back until you find some. Check the ground wire.
SOURCE: 2002 cadillac sts headlight problem
Why did you pull them out? I suspect that the right one did not get seated properly or there is corrosion in the connection - is the housing watertight? I don't think it's a relay since neither would work. Could be a bad ground connection on that side.
SOURCE: 2003 Seville STS low beam headlights don't work
ya its is prolly the bulbs, open your hood. look behind your headlamps, some have covers for the low beam and high beam. if there are covers turn on your high beams so you will know which bulb is your lowbeam. if you can unplug them. after cover is removed and you can acces the bulbs. they either twist out, lefty lossey. or they have little metal retainers that you have to move a certian way before you can swing the retainer out. its like a door you just have to unhook the proper side of retainer and the other side will be hinged. use a flash light and look at it close. good luck
SOURCE: headlight bulb out
pop the hood take the plastic cover off it should have about 6 clips then unbolt the whole light from the car should be 2-3 screws and pull it out once u do that u might need to unscrew the plastic cover of the back to get to the wiring harness them u can change the bulb and reasmble
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