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I would first check fuses. Make sure you have power to and from the bulb sockets. If not power make sure wiring, grounds and wiring connection are good. Verify you have power to bulb socket, may have bad socket but unlikely all went out at same time. My last thought make sure you have power to and from switches.
Not sure what vehicle you have but these are my thoughts in general. https://www.youtube.com/watch?v=3zQCG06gFN0
Some vehicles may have a fuse for blinker and even separate fuses for high and low beams. You could have relays for blinker, low beam and third relay for high beam.
If you go to google and put your year make and model also put fuse box diagram or owners manual you may find your fuse box diagram.
example 2015 GMC terrain fuse box diagram
You may have several link pop up if you look through them you may find one which works.
Hope this helps.
I've checked the wiring diagram for your vehicle and the fuses are in the under hood fuse and relay center located on the left side of the engine compartment, the interior fuse block is on the left of the steering wheel However I think your problem is bulbs what happens is that one low beam burns out and you don't notice so when the other goes out it appears they both went out at the same time. The same fuse powers high and low beam so if the high beams work the fuses are good. I hope this helps. Take care.
What relay's an fuse's ? open and close circuit test to the bulb connectors ??????? Voltage testing with a DVOM - digital volt ohm meter !
B+voltage going into the multifunction switch ? Fuse F2.59 7.5 amp located in the central junction box . Green with red trace goes to mulitifunction switch (high beam ) pin #6 , Pin#7 multifunction switch green with yellow trace goes to control (energize ) High beam relay . Control side high beam relay grounds at G103 ! High beam relay located in the battery junction box . Do you know how to test for B+ voltage ? Forget this open and close circuit test . Voltage drop testing is the correct way to test a electrical circuit , the circuit has to be energized .
Do you know what a wiring diagram is ? Did you view a wiring to know what you were testing ? If know ,you can't say you have a compleat circuit. Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info ,under system click on lighting ,then under subsystem click on Head lamps . Click the search button then the blue link . Using a volt meter test . Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts Electric Testing Techniques You Need to Know
The high beam relay is c1050 ,thats the only one you need ! Do you know about relays ? VEHICLE RELAYS Operation Diagnosis
Is it a singe ground issue? Fuse? ?????????? Without doing some testing we would be just guessing. You need to test the electrical circuit to know for sure . Voltage drop testing ! Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia Electric Testing Techniques You Need to Know
You need a wiring diagram so you know what wires to test . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model and engine size . Under system click on lighting ,then under subsystem click head lamps . Click the search button then the blue links. Look at the wiring diagram to see what all is involved in making the head lamps work .
There is a relay for the high beams that may be faulty. That relay is located in the power distribution box located under the hood of the vehicle in the engine compartment. The relay location will be in the "R5" position in that panel (see diagram of layout below). Other then that you could be looking at a bad switch or a wiring problem nut pretty sure this will be your problem. I hope this helps and good luck.
There is a relay that controls the headlights, volvo calls it a step relay. You will have to check that power is getting to this relay. If not, check all fuses and wiring. If power supply checks out ok, you may have to replace the relay. Let me know if you need any more info or a wiring diagram.
ya know it kinda sounds like the headlight switch that switches from high beam to low beam has a bad contact. You don't have one of those 4-beam modules that turn on all 4 lights on high beam do you? that thing screwed my whole headlight system up, I ended up throwing it in the trash.
I have the chiltons and haynes manual, I'm sure between the two we'll find a good diagram. I gotta get my youngin to open house at school, but I'll pull the books out and send you the wiring diagram.
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