About Windshield s
8606 Mississippi Street   
  Merrillville IN 46410  
   (219) 769-1905

9:00 am to 5pm Monday - Friday
Closed: Saturday & Sunday 
What is a light sensor?

Does my vehicle have a windshield sensor?

Many modern vehicles have automatic headlights, eliminating the need for a driver to turn on their headlights at dusk, dawn, night, or during poor weather and storms.

car windshield light sensor
Do I have a light sensor?
does my vehicle have a light sensor
There are a few ways that you can tell if you have a light sensor. The easiest is if your lights turn on or off automatically depending on how light it is outside. If they do have that functionality, you probably have a light sensor installed on your vehicle. You can usually find where the windshield sensor is located either:

Mounted on the windshield next to the rain sensor
Behind the rearview mirror
On the dash near the windshield edge
How does a light sensor help my driving?
It is there to support the field of vision of the driver, making the usage of the headlights more efficient. Using sensors that detect the ambient light, or illuminance, around the vehicle, this system will automatically turn on your lights if it is getting too dark.

If you are driving for an extended period of time into the night, you may not notice how dark it is, which could be dangerous for other drivers who rely on your headlights to note your position on the road. To save your vehicle’s battery life, these sensors will also turn off your headlights, too.

If my windshield is cracked or chipped, do I need to replace my light sensor?
Windshields with small cracks or chips can usually be repaired if they are small enough, helping you avoid replacing the light sensor.

If your windshield has a crack that is larger than a quarterl, then it really should be replaced, along with any technology systems attached to the windshield.

Light sensor systems are available for purchase on the market, but OEM re-installation is the best way to ensure that it will function properly.

If installed poorly, the illumination detection may turn the lights on when not needed, thereby draining the battery, or not turning on when it is needed. Sensor failure results in the headlights illuminating during broad daylight when not needing to be on, or the ambient light sensor could have worn out. Whichever the case, either replace the entire windshield, or replace the headlight sensors.

Light sensors and replacement

repairing vehicle light sensor
Should you need to replace your windshield or auto glass window, inspect the light sensor to see if the wiring is intact, as you may need to purchase a new sensor if the wiring is damaged.



Merrillville Auto Glass & Trim
8606 Mississippi St – Merrillville IN – 46410
Hours are : Monday – Friday
9:00am to 5:00PM
(219) 769-1905
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Some auto light sensors are on your dash