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Re: I have a 1997 Kia Sephia and the headlights only work...
Test for voltage to low beams. Often one light fails, and does not get noticed, then the 2nd one goes and misleads one to think something major has happened...
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So when the car is off and you have your headlights switched on both the low beam setting and high beam setting work normally. But once you start your car your low beam headlights work but when you switch to your high beams the right headlight shuts off? I don't know how that'd be possible since the controls for your high beam and low beams aren't connected to whether the engine is running I'd suggest changing your headlight bulbs
check for a damaged wire for the low beam. Also wouldn't hurt to check the ground wire as the high beam will try and ground through the low beam but not visa verse
Each light has its own fuse. Have you checked them? Maybe try switching two of them to see if they swap which one works... Once in a while a fuse that looks good has actually gone bad. Comment on this post if this doesn't help and we can move to the next step. Good luck!
Check the headlight relay, and check for loose connection. Unplug the headlights, and see if you get some voltage while the switch is on. Low voltage reading indicates a loose connection. Listen for a relay if it clicks when you turn it on. Pull out the relay open it, and check the contacts for signs of arcing characterized by burned apearance.
Fuse 22 and fuse 23 are left and right low beam headlamp fuses located in the PDC. 23 and 24 are high beam fuses. There is also a low beam and a high beam relay in PDC as well. If no headlights work I would check for main switch or multifuction switch (wiper/high beam) since each light has its own fuse and relay.
possibly head lamp switch. daytime running lights on separate circuit and use the high beams at reduced voltage. does flash to pass work? that's high beams too. do high beams work?
If all fuses and bulbs are fine, it's probably a problem with the wiring harness. Take it to the dealer. Wiring harnesses are not something to do by yourself unless you're experienced with wiring on the specific car.
I have a '96 toyota tacoma head light are fine, went to buy new ones but low bean still does not work on both. High beam works. Is this a problem with the relay.
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