There's a button on the right side of the steering wheel that says serv push that button. It's put right there for when they use them as police cars you can cut the headlights off. You will probably notice that dash lights are on.
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The basic problem is too much resistance in a circuit. You have to figure out which one and where the resistance or short is. You can take the fuses out one at a time or all at once to see which circuit is pulling too much current. It could be a faulty ground somewhere and the lights are grounding thru the wrong circuit. Or something shorted together and pulling current thru the wrong circuit. Like the headlights running off the dash light circuit. You may need a book with wiring diagrams to know what to check.
There are relays for the head lights,but see if the bright lights work also,the bulbs maybe blown,not uncommon for both to blow,then there is the headlight switch,if the brights do not work,it is most likely the headlight switch giving the problem.
It's possible that both low beams have burned out. These modern bulbs are bright enough that sometimes you don't realize that one burned out, before the second one burns out.
You need to check for voltage at the headlight with a volt meter or test light. Or you can replace one bulb and see it works.
I suppose it's possible that a relay or fuse is out. You might check the owners manual for the fuse location.
There should be a reset button in the fuse pannel. It can be used to reset the low tire pressure light , and the change oil light.
Instructions should be in owners manual , or you can google it.
Chevy dealership should do it for free in my opinion.
It sounds like your low headlight relay may not be working. not sure on this particular model, but most of them have relays for high and low beam headlamps. these are usually located in the power distribution panel under the hood. before replacing make sure you have power to them. if not check for wiring problem, if power is present try a different relay.
The headlights have 2 fuses. One is a main power feed under the hood in the distrabution box and the other is under the dashboard. Check the fuses and then check for power at the switch. If you have power at the switch then its not a fuse its the switch and the trailer you had connected most likely shorted and back fed into the parking and dash light circuit. Those circuits also run from the light switch.
Ok, locate the relay panel (probably inder the hood) and find the relay that controls the headlamps. With your headlight switch "on", pull the relay and see if your getting a hot current to the connectors in the relay panel. If it's hot, replace the relay. If no current, it's probably your headlight switch.