Q: How Does a Rain-Sensing Wiper System Work?

asked by on November 23, 2015

How does a rain-sensing wiper system work?

Rain-sensing wipers operate based on an infrared light mounted by the rear-view mirror. A light beam is reflected off the windshield at a 45-degree angle. If there is rain, snow, or something else on the windshield, less light reflects back to the sensor and the rain-sensing wipers turn on. The wiper system is still equipped with an override to control high and low speeds in the case of rain-sensing wiper malfunction.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

I just want to know the location for fuel rail pressure sensor for hummer h2 model 2008

Hi and thanks for contacting YourMechanic. Look on the fuel rail to your engine and you will see two lines that will meet to the rail on one side. Right just before the two lines, you will see a sensor...

My ABS light went up

In my experience the hub and sensor both needs to be replaced. The sensor will most likely break off when trying to remove it. If you do manage to get it out, the front hub bearings wear will cause erratic...

Fuel rail pressure sensor has failed.

Without knowing the reason the vehicle will start with the sensor disconnected then it would be advisable to not drive the vehicle without getting it repaired. The fuel pressure sensor is used to control the fuel pressure to the motor...

How does the automatic climate control system detect the temperature?

In order for the automatic climate control system to work, it needs to know the temperature inside, as well as the temperature/amount of sunlight entering the cabin. It gets this information from two sensors. Sunlight Sensor: The sunlight sensor...

Brake rotor burned after brakes replacement

It sounds like the parking brake mechanism has failed and kept the brakes on in that wheel. I cannot say if the dealer should have found the problem at that time, since the problem may not have been there at...

i cannot find a used engine for my truck,will a engine from a grand marquis fit in the truck?

I looked up the two applications. Those two engines use completely different castings for both the heads and the block and the flywheel (flex plate) is different as well which will make it incompatible with your transmission. If you search...

The oil light keeps coming on when we brake or park.

This may be a sign of a faulty or failing oil pressure sending unit switch. This is a unit that monitors the oil pressure inside the engine block and relays this information to the computer. When this is faulty or...

Car floods bad when cold. If I give it a little gas it jumps and jerk and if I mash it on down it takes off. I've replaced the O2 sensor and coolant temp sensor.

This may be related to a dirty or faulty idle air control valve. This is a unit that reads the air intake at low or idle speeds and relays this information to the computer which then makes adjustments to fueling....

2009 Nissan Murano has the P0420 trouble code. It says the normal bank 1 issue, but now it says short to VBAT. What is that and how to fix it?

Hi there. From the description you have provided, for your vehicle's P0420 trouble code. I suspect the O2 (Oxygen) sensor you replaced has created an additional concern for your vehicle. Either, the O2 sensor is incorrect by application or is...

Related articles

How Long Does a Speed Sensor Last?
Today’s Today’s cars are equipped with a very wide range of sensors. Yours has a mass airflow sensor, at least one oxygen sensor, and many others. The vehicle speed sensor (VSS) is usually located on the transmission’s output shaft (although...
Is It Safe to Drive a Vehicle With a Cracked Windshield?
Your Your car’s windshield is more than just a window to view what’s in front of you - it protects you. Without a windshield, you would be pelted by road debris kicked up by other vehicles, snow and rain, and...
Is It Unsafe to Continue Driving a Vehicle with Broken Wheel Speed Sensors?
Car wheel speed sensors are an important safety feature. It helps the ABS system work when you need to make an emergency stop.