My low beam/DRL/ headlights are not working. The parking lights work, high beams work, fog lights work so I am assuming it is not the headlight switch !- Not the bulbs- Not the fuses ( tested 29 and 34 in fuse box - confirmed power )I have no power at the headlight bulb end of the harness? No loose connections. At first it was the right side light, now it is both sides. I am lost I have been through most anything I can think of. Please help.


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This very well could be the switch. What I would do is go to the smart junction box and measure voltage on the Blue/White wire in pin 14. This sounds be the low beam signal from the switch. If you have power on this wire at the smart junction box when the lights are in low then it is not the switch but the junction box. Let me know if you have questions. Thanks
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What should the voltage be at pin 14? I only have 3v at the pin and the same at the headlight connectors on both sides. I have 12v going into the SJB from the Battery Junction box.
If you take a look at the SJB it says that wire is a sense wire. That means it is a 5 volt circuit. So 3 volts makes sense when you have the switch on low beams. This is actually good because that confirms you have the switch telling the SJB to turn on the lights. However, if you have no voltage on pins 3 and 20 coming out of the SJB then that means the SJB is the issue. Let me know what you find. Thanks
So I purchased this nice SUV listed above Eddie Bauer edition in great condition and low miles. Anyways, when I start the vehicle and then turn my headlights on the headlight very quickly come on then turn off. This leaves an error message of checking both driver and passenger side head lamp. What could cause this? A module? Location? Ease of replacing. Or could it be more of loose wiring? Help please!


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If you have the headlights with the automatic on option do those work and it only shuts off if you use the switch to turn them on? Or does it do this even with the automatic headlights? Do the parking lights work? Are these the stock headlights and bulbs? The description sounds like you could have a bad ground to one of the lights and it causes the system to think there is a problem. Both systems use the same light wiring, I would check the grounds for a good connection on both sides. They use the black wire (or a black wire with gray stripe) for the ground. Each one is separate. If the grounds check out okay and they are stock parts then I would suspect the smart junction box up behind the dash. It isn't that hard to change but I would have the truck scanned by a dealer level scan tool as it can test the module to be sure it's the issue first. It isn't a cheap part to swap without being sure it's the problem first.