A few days ago, I replaced the bad bulb on my headlights. I could only find fuses for the headlights in the under the hood fuse box I did not see any in the interior fuse box. If this relay goes bad, it could allow power to the high beams, but not the low beams. With the low beams on and the light bulb out of the connector, the yellow wire reads 11.8. Since high work, this leaves out the headlight switch and grounds. I get a low beam headlamp fault on the console, but when I replaced the bulb, it still doesn't work. I have 4 10amp 2say LWR they have 12 volts to them 2 say UPR they read zero VDC. leaving one of 3 things. Fuse 25 and fuse 31 Since both are out, check owners manual for low beam headlight fuse. Low beams then go to a Central Junction box where they are again fuse, but a 10 amp. Headlight Bulbs Today, after working for the last few days, I noticed that the low beams are not working. A bad fuse may result in a single-sided headlight failure. There is however also a single lowbeam relay, which gets its signal from the body control module. I also have a 40 amp head main that checked good. It is only the low beams that are not. I have checked the 20 amp fuse in the panel and it is good too. No low beam on international 4300. The fuses check out. The black ground wire for the lamp has 0.1 ohms. One fuse for righ, one for left. If you suspect a blown fuse, locate the appropriate fuse (number 21) underneath the car's dashboard. There should also be red fuses for both the left front and right front low beams; inspect these fuses as well. The number seventeen fuse has has power to both sides of the fuse with the low beams on. Either bad multifunction switch, bad low beam fuses or a wire break between the multi and fuses. The high beams are working, and everything else seems fine. I checked the fuses, they seem to be fine, as far as I can tell. I also followed the none power almost into the firewall. Then check the connector on the multi-function switch on steering column. No power to the head light lamps. The wiring harness looks OK, but I don't know which pin is supposed to drive the low beam… So have a look at this relay first. If you don't have voltage at the fuse, go back a step. It is just the passenger side that is out. from the fuses? Then go into the multi-function switch. That's the power mosfet assembly for the low beam. There are 2 10 Amp fuses, one for each front low beam light (#14 and 15 in the fuse box), so won´t expect for both to blow at the same time. 1. Where I find the fuse and what other problem could it be. The car is 6 months old and there's no condensation inside the housing. The low beams are fuse at 20 amp fuse 10. I checked no 12 VDC to the low beams. If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. 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