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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.
I assume no lights work at all ... not parking lights or low or high beams...
Therefore the most likely reason is no voltage to the headlights because of a bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring fault.
The relay is often located in the power center in the engine compartment, but there may also be a fuse in the fuse panel under the dash. If you do not have new relays/fuses in the vehicle you are sort of stuck.
Your headlight relay is connected improperly. It could even be the wrong relay is installed. Most relays have a low power (low amperage) switch connected as the control. If the switch is energized, it causes a magnet to pull a much bigger switch inside the relay. That big switch usually has three connections. One "common" and on that is connected to common when there is no power to the control input (known as "normally closed" or NC) and one that connects to common when there is power connected to the control input (normally open or NO).
The name indicates the condition when no power is on the control connector of the relay
It it is by guess that the NC and NO connections are crossed.
Check voltage to lamp assembly. Could be a relay, a bad wire, or a bad connector. Since one headlamp works correctly, the switch assembly probably works. Without a wiring diagram. I can't tell whether the headlights get power directly from the switch or not... Time to buy a manual.
Usually the power feed to the headlight switch isn't fused. It will come from a fusible link under the hood. On the right side of the firewall there is a black plastic cover, under it are the fusible links. Check here for a possible blown one. I would also suspect the headlight switch may have originally caused it to blow if thats the case. If you have already replaced the headlight switch, replacing the fusible link should repair the lights. Make sure you replace the fusible link with the same gage wire and same length.
The wiring for these headlights is complicated. The body control module (BCM) controls whether the headlights should be on or off depending on the ambient light sensor readings. Your headlight switch should override this if switched to on - if it doesn't do this, the headlight power relay may be faulty.
The daytime running lamps (DRLs) are also controlled by the BCM and a DRL relay, also controlled by readings from the ambient light sensor. If they will not come on, the DRL relay may be faulty.
However, the root cause could be a fuse, faulty light sensor, headlight switch, or BCM. I would start by checking the fuses and checking/replacing the two relays.
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.
Do you have high power globes fitted more than 65W. If so you will need a relay to supply H/Lamps as the original headlamp switch has built in circuit breaker only good for about 15Amp
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