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It is located in the underhood fuse/relay box , marked DRL 10 amp fuse ! Also if that is good check the DRL relay in the same fuse/relay box .Your light sensor could also be bad .
The daytime running lamps (DRL) will operate when the ignition switch is in the RUN position, for automatic transmissions (A/T), the gear selector is not in the PARK position, the headlamp switch is in the AUTO position, and for manual transmissions (M/T), the park brake is released. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate. The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the DRL or the headlamps for auto headlamp operation. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. The DRL can be manually turned OFF by depressing the AHL/DRL switch in the headlamp switch
Do you know that on inside of fuse box lid it shows what fuse is what .
On a 99 chevy silverado if equipped with auto headlamps there is a sensor on the dash near the front center of dash a small black bubble. If it is covered it will cause the lights to stay on. The day time running lights are typically seperate from the head lamps
Theres a sensor in the middle of the dash by the front windshield that detects sunlight and triggers the automatic headlights. The main headlights and daytime running lights might be on a different circuit, in which case they daytime running lamps would turn off at night and the main headlights would turn on, indicating the main headlights arent working and the daytime running lamps are working as intended.
I would check all the fuses related to headlights, check the bulbs and check the switch, then last the light sensor on the dash.
Hello, my name is Ben and I can help you with this. First you must remove the headlight assembly to gain access to the Daytime Running Lights ( DRLs ). Open the hood and look at the top of the headlight, you will see 2 gray colored rods, unsnap them and pull them straight up and set them aside in a safe place. Now you can unplug the headlight assembly and remove it. The turn signal/DRL assembly can be removed by pushing in on the spring clip on one end of the housing and swinging it out and away from the truck. The bulb holders just twist out. I hope this helps, if you have any other questions, please ask, Ben.