Ambiet Light Sensor

[Mikloangelo]

What does the ambient light sensor actually do, other than turn on DRL? It appears my truck had the DRL delete and has an extra turn signal in its place. I ask the question because when I replaced my dash with the TEMU dash its hole for the ambient light sensor is larger than the original. Which I found that the 03+ model came with a larger two wire sensor. I bought one to install and it fits fine and the wiring matches up. But I cant tell what exactly the sensor is meant to do. I have my old sensor, a new sensor and an 03+ sensor And I cant tell any difference.

 

[stutaeng]

It's like a dusk-to-dawn sensor on your house exterior lights.

If you drive under a long bridge, it will automatically turn on your headlights.

I replaced it on my 99 Silverado, way back in like 2009 or so. Been working good.

On my 06 Suburban, I'm pretty sure the sensor fell down because headlights are always on. I have to manually turn them off. The problem is my aftermarket stereo's display is always dim because of that sensor; it must think that it's night. Screen is hard to see in the bright sunlight because it's dim.

 

[99Sierra2500]

Yes, it controls the dash, and radio light dimming.