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Based on your description, it sounds like the issue may be related to the headlight switch or the relay that controls the headlight circuit. The headlight switch may not be sending the correct signal to turn on the headlights when the ignition is on, but the relay is still working to turn on the headlights when the switch is in the on position and the ignition is off.
It is also possible that there is a problem with the wiring or connections in the headlight circuit. This could be causing the switch to not receive power or the relay to not receive a signal to turn on the headlights.
I would recommend having a professional mechanic diagnose and repair the issue. They can use their diagnostic tools to check the electrical signals in the headlight circuit and determine the root cause of the problem.
Solution: If both headlights aren't working, it's unlikely that a bulb is at fault. The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. ... Consult your owner's manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.
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Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don't work or low beams don't work. The cause: A burned out bulb, or a problem with the high beam switch or relay. https://www.lifewire.com/fix-non-working-headlights-4137021
there could be a black plastic box that has fuses but also you will find relays. From the relay you can find the socket that feeds 12v directly into the headlight and see if headlight is ok and if the relay is suppling 12v to the headlight. Also from the relay you can also check if the switch is supplying 12v to the relay coil with a voltmeter or a 12 volt probe tester. you may have a faulty relay but you could test this via a volt meter.
you may have blown globes by getting a wire and putting terminal connectors that match the relay legs and manually supplying the 12volts to the headlights from the relay socket you can test if the globes light up . So basically you are doing the relays job
Tree is not a relay for the headlights. The headlights are ground side controlled by the FEM module. The FEM module receives lighting information from the instrument cluster which is the "gateway" for the lighting info. The headlight switch as well as the high/low and turn signal information is routed through the instrument cluster and is them delivered to the FEM module or the rear lighting control module.
In the late 1990s GM and most other car companies changed the configuration of headlight circuits. Now the headlight switch provides the ground circuit instead of power. So yes there is a relay between the main switch and the dimmer.
The headlights get power from left and right 15amp fuses, and the relay and main switch provides the ground circuit. Your owner's manual should tell you which relay in the box is for headlights.
Sounds like you need to check out your local public library for a service manual to find the headlight relay, or in the owner's manual. Either one will help you determine which relay is which. It would be a good idea to take notes and that way you will know which relay controls what.
Assuming the headlight housing is not damaged, the motor or the relay may be at fault. Try switching the breakers (found under the hood- check your owner's manual for the exact location). Also check your fuses. If you can get the headlight to come up by switching the relay breakers, remove the breaker prior to turning off the lights. That might make the light stay up. There should be a small manual operator located behind the light housing that can be used to put up the light.
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