Windshields with small cracks or chips can usually be repaired if they are small enough, helping you avoid replacing the sensor parts. If your windshield has a crack that is larger than a currency bill, then it really should be replaced, along with any technology systems attached to the windshield. 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.
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A few easy ways to tell if you have a rain sensor system installed in your vehicle. Rain sensors and light sensors usually appear very similar.
Do the wipers start automatically when it’s raining? Is there a square panel mounted on the windshield near the rearview mirror? If you’re looking inside the cabin of your car from the outside, the sensor would be located behind the rearview mirror and you can tell it’s the sensor because a strip of lens or film will appear facing the outside.
Some cars may have one or the other, or both. The rain sensor is also typically adjacent to the light sensor. This system turns the windshield wipers automatically by detecting rain on the windshield.