The ABS light is on, what should I do? Why does the abs light on the instrument panel light up and what to do in such a situation The abs light on the dashboard

The ABS system plays a special role in the operation of the entire vehicle, as it is responsible for safety during movement. Many drivers themselves, without knowing it, use the braking system in the wrong way. As a result, the work of the ABS system is lost, which leads to an accident. Most often, drivers face such a problem in winter.

Due to slippery roads, the driver constantly brakes when the car skids. In order to understand the problem when the abs light came on and what to do in this case, you first need to know how this whole system works.

The essence of the ABS system

The ABS system was designed specifically for drivers to see their mistakes when they apply the brakes hard. In the ABS system, not all four wheels were initially programmed to lock at once. When braking hard, the wheels start to stop in turn, which reduces the likelihood of the car skidding. As a result, this reduces the speed of the car, but it should not stall.

What is included in the ABS system

• Wheel sensors that are responsible for their rotation. Each wheel has a separate sensor;
• Hydraulic block;
• A device that responds and controls the operation of the hydraulic unit itself;
• Instrument bulb abs, .

The main causes of ABS system malfunction

If the ABS light on the dashboard lights up, then this indicates a problem in the system. The driver needs to contact the technical service to find out the cause of this warning signal. When the system is working properly, the light comes on when the engine is started, and after a few seconds it goes out. This indicates that the system is working properly and is in an active state. There are times when the light is on, but the car will not start.

In this case, there are many reasons, such as:

• The problem lies in the connecting cables;
• The ABS control unit is defective;
• There is no connection with one of the sensors, which is fixed on the wheels;
• The sensor on one of the wheels or the sensors on all wheels are out of order.

As for the wire break, it can occur while the car is moving. During vibrations when driving on bad roads, cable connections begin to loosen and at some point break or even break. The driver will be able to solve the problem of this nature on their own, without seeking help from professional specialists.

If the ABS sensor light comes on due to the failure of the sensors, then this may be the fault of the debris that clogs while driving. The driver cannot solve such a problem on his own. You need to take the car to the service station. Often the reason for the sensors not working is due to the incompetence of the master at the service station. During the repair of the wheels, the sensors are constantly turned off. Only after the masters install them back, they forget to connect them to the wheels. Improper wheel alignment also causes the ABS light to come on.

With the ABS system, you need to be extremely careful, because you can break it quickly, and fixing them will take a lot of effort, time and money. If the ABS system light comes on due to a broken control unit, then this cannot be found out on your own. Only the on-board computer, which issues an error code, can save the ABS system. This code must be correctly decrypted, because it is the cause of the system failure.

If the ABS light turns on and off periodically, you should know that there is a problem with the contacts. The connection between the contacts is weak and therefore you need to inspect the wires. It is much more difficult to independently identify the cause of the constantly burning indicator.

Auto-off light bulb

Sometimes the functioning of the ABS system goes astray and in this case you can not contact the technical service for help. There is a simple way to do this. It is required to accelerate on a flat stretch of road at an increased speed, and then brake sharply. Sometimes such a procedure helps to restore a failed system and the light stops lighting up.

If this does not help, then only experts can come to the rescue, who will diagnose the system on a special computer and make an accurate conclusion why the ABS light comes on. It is impossible to spare money for such a service, since the safety of the life of not only the driver, but also the passengers who may be in the car depends on it.

It will be useful for many drivers of modern cars to know what to do if the ABS light comes on. Some drivers are even afraid to continue driving when this signal is triggered. In this case, you don’t need to be afraid, the brakes will work, only the anti-lock system will not turn on.

This device has been specially designed to make it easier to drive a car in extreme situations that occur quite often. Those motorists who only drive cars with such a device are lost when driving cars without it.

What is ABS?

This abbreviation stands for anti-lock braking system. Its main task is to prevent the wheels from blocking when the car brakes. It is based on sensors that are required to monitor the speed of the car, as well as the speed of rotation of the wheels. For most modern cars, an additional unit is installed, this is a brake force distribution system.

• A sensor that reads the speed of rotation of the wheel (installed on all wheels);
• Hydraulic block;
• Unit for monitoring the health of the hydraulic unit;
• ABS warning light.

Health indication. The operating principle of the health indicator is the same for all vehicles with ABS. The first signal from it appears immediately after the ignition is turned on. The signal lamp signals the operability of this device and should go out a few seconds after the engine is started.

In the event that the light bulb did not go out for some reason, it means that there were problems in this block. If the signal of this lamp flashes while driving, then you need to check the performance of the anti-lock braking system.

Reasons for turning on the warning light

The inclusion of a warning light on the instrument panel signals to the driver about problems in the anti-lock braking system. The brakes are in working condition, but in an extreme situation you will need to rely only on your driving experience. So why is the ABS light on?

• One of the most common reasons for such a situation is the failure of one or more sensors of this system. They are installed near each wheel on its caliper. The failure of any of them is enough to signal the driver about the malfunction. This can be caused by changes in the gap between the sensor housing and the crown of the toothed rotor;
• The same can happen if the control unit loses communication with the sensors, caused by a break in the connecting cable or after oxidation of the contacts. Sometimes, during maintenance or repair, they are turned off and then forgotten to be connected;
• A strong discharge of the battery can also initiate the inclusion of a light bulb;
• The occurrence of problems in the hydraulic pump. They can be caused by failure of the hydraulic valve of the system or due to malfunctions in the control unit itself. It can also lead to inept intervention in the operation of the ABS.

How to solve such a problem?

Someone can sigh and say that they have finally reached the goal of this article. If so, then I would like to offer a few tips for solving such problems:

• Check the connection of all contacts of the device. There are only five of them in the system, one near each wheel and the fifth one is located in the engine compartment of the car. Checking is easy, you need to disconnect all contacts, clean from dirt and oxidation. When all this is done, they are installed in their place;
• If the ABS control unit became the reason for the warning light to turn on, it is almost impossible to solve this problem on your own. In vehicles with an on-board computer, you can see the error code for this system. If you know how to decipher these errors, you will be able to find out more specifically about the problem, but this does not mean that you can solve it yourself.

It's simple: if the ABS icon lights up on the instrument panel, then the brake assist system is faulty. This does not mean the failure of the entire braking system, but we consider it necessary to understand the reasons for this and the consequences.

What is ABS

The anti-lock braking system does not allow the wheels to "stand up" during heavy braking, dosing the deceleration force. ABS usually increases the stopping distance, but leaves the driver with controllability. A modern ABS system may also include traction control, dynamic stabilization devices and an emergency brake assist system (BAS). The complex of such systems works for the benefit of the active safety of the car.

The ABS device includes several main components, including:

• Wheel speed and acceleration sensors located directly on the hubs;
• Hydraulic unit, including solenoid valves, pump and hydraulic accumulators (actuators);
• An electronic control unit (ECU) that ensures the system operates in the most efficient mode. Based on the information collected from the sensors, the device sends commands to the ABS actuators.

Reasons for the anti-lock braking system light to come on

Normally, the ABS indicator on the instrument panel lights up for a few seconds and goes out every time the engine is started. If the icon is not displayed at this time, the system is inactive and needs to be checked. There can be several reasons why the ABS light came on:

1. Breakage of wires;
2. ABS sensors are dirty, disabled or out of order;
3. Damaged ring gear on the wheel hub;
4. The electronic control unit of the system does not function.

Regardless of why the ABS is on, the on-board computer collects information about problems and analyzes it to generate an error code. The detection of a specific malfunction is indicated by the same signal lamp.

Why ABS failure is dangerous

If the indicator does not light up due to a burned out light bulb, it will not be difficult to solve the problem. Just replace it with a new one yourself or with the help of service employees. In the event that the anti-lock braking system indicator lights up while the car is moving, be extremely careful when braking hard. Of course, a complete loss of control will not occur, but it can bring the car. A failed system will not allow the car to move with the brake pedal depressed, all the more accurately avoid obstacles.

What can you do before going to the car service?

If violations in the ABS operation are detected, it is necessary to conduct a visual inspection of the system elements.

1. Checking the electronic control unit for the presence of water inside the device and damage to the housing is carried out after disconnecting the brake pipes and wires. The ECU is located next to the brake force distributor. If you find liquid, the device must be purged and dried. For safety reasons, it is important to disconnect the battery.
2. The health of the fuses can also be checked on your own. Several electronic components related to the anti-lock system are located on a common panel under the hood.
3. The wires connected to the sensors on the wheels should also be inspected. To do this, raise the car body with a jack so that the wheel hub area is clearly visible. Such a check allows you to detect wires that have flown off the fasteners or lapped.

If after the described actions the ABS light continues to burn, check the activity of the system in motion. Accelerate the car to 40 km / h and sharply press the brake pedal to the floor. With a working ABS, vibration is felt, with the anti-lock braking system turned off, there are no twitches. To conduct a thorough examination of the ABS components, the car must be delivered to a trusted car service. With the help of an autotester, the masters will conduct computer diagnostics and analyze the error code of the anti-lock braking system. Sometimes you can fix the problem by "resetting" the error by removing the battery terminal.

In the event of any malfunction of the car, contact the official service centers of FAVORIT MOTORS Group of Companies. Qualified specialists provide a full range of services for maintenance, diagnostics and repair of cars of foreign and domestic brands. Our masters undergo regular training in authorized training centers, which guarantees high quality service at affordable prices. In our work, we use only original spare parts and reliable consumables. Take care of the safety of your car, trust the professionals!

All modern cars are equipped with ABS sensors that include an auxiliary brake force control system. This is one of the thin systems that often fails on budget machines. In Europe, for several years now, manufacturers have been obliged to equip any production cars with this security system, and manufacturers of cheap cars clearly save on high-quality ABS by installing systems that are not very durable and practical. The sensors of this system are installed on all four wheels, they are activated when there is a sharp braking with a wheel lock. In this case, the system unlocks the wheel, allows it to turn and gradually slows down.

In fact, it turns out that cheap ABS not only does not help to brake more efficiently, but also lengthens the braking distance. There is another serious problem - after several years of operation, when the car is out of warranty, on many cars the ABS light comes on for no reason. Firstly, it is inconvenient to drive with a light on the dashboard constantly burning, and secondly, if there is a clear impression that something is wrong in the car. Interestingly, the ABS light does not always mean a problem with the anti-lock braking system. There may be other problems as well.

Why does the ABS light come on at all?

In a normally running car, this indicator shows you that the wheels have been unlocked. In this case, everything works fine, the sensors caught the need to turn on the security system, initiated its operation and demonstrated to the driver that some braking assistance was provided. When you see the ABS light on while braking, it's best to release the brake pedal a little and take control of the car. If you have an expensive high-tech car, you can trust the thoughtful systems and let ABS+EBD do the job. In other cases, the light bulb may burn for the following reasons:

• the sensors are clogged, the on-board computer shows that a diagnostic error code should be read;
• dirt or rust got on the sensors, which caused the anti-lock braking system to be switched on by mistake;
• there is a problem in the on-board electrical system, which is demonstrated by the ignition of arbitrary bulbs;
• the wheel bearing has failed, which forces the sensors to mistakenly turn on the anti-lock braking system;
• the fuses in the block responsible for the ABS system are out of order and pass the signal directly;
• An error has occurred in the computer that caused the ABS light to come on.

Also, sometimes there are troubles with the generator and other elements of the electrical circuit of the machine, which can result in the ignition of the diagnostic system bulb or warning lights of any type. For example, on a Volkswagen car manufactured in the 2000s, the anti-lock braking system light is on even if there is an error in completely different nodes. Therefore, self-diagnosis is only a partially acceptable method of solving the problem, because often the driver does not have special tools at hand for a good study.

What can you check yourself when the ABS light comes on?

The first thing you can do on your own in such a situation is to go to the car wash and ask for a quality wash of the rims. Often, with the help of such an intensive washing under pressure, it is possible to clean the ABS sensors located near the brake discs. On the way to the car wash, you can perform another simple test. Accelerate to a speed of 80-90 kilometers per hour, close the windows and turn off the music. If in this mode of travel you hear a slight or annoying rumble in the area of ​​\u200b\u200bthe wheels (front or rear), the probable cause of the burning bulb is the failure of the wheel bearing. You can also do a few other things:

• inspect the fuse box and replace the module that is responsible for the operation of the anti-lock braking system;
• if possible, read the diagnostic error code and read about it on the forums;
• ask a specialist a question, describing your situation, and then try to correct the error yourself;
• independently get to the ABS sensors by jacking up the car and removing the wheels, check their cleanliness;
• inspect the electronic control unit under the hood, check for the absence of liquid in it and on it;
• the best solution is to go to the service station and pay for the diagnosis of the anti-lock and electrical systems of the car.

The last step will definitely be the most correct, as you will receive a clear answer to your questions, you will be able to determine the repair budget and the presence of serious problems. This is the only way to completely get rid of problems with a burning bulb in the diagnostic system and other unusual ways of car behavior. It is enough just to connect computer diagnostics with an advanced program and test the machine for possible errors. Within a few minutes you will receive the information you need and will be able to deal with the problem yourself or professionally.

ABS turns on randomly, the light blinks or lights up intermittently

One of the most difficult forms of breakdowns is the constant blinking of the ABS light. This means that the anti-lock braking system sensors send incorrect signals to the computer, which, in turn, gives other incorrect commands to the vehicle's systems and modules. Many people prefer to simply turn off the anti-lock system in such cases, since unpleasant incidents can occur. For example, turning on ABS at a speed of 90 kilometers per hour with light braking can damage the undercarriage of the car and contribute to a complete loss of control over control. It's better to do this:

• bring the car for diagnostics to the service, find out the cause of the chaotic operation of the equipment;
• for domestic cars equipped with a primitive anti-blocking tool, it is better to immediately turn off the system;
• complex structures and on-board electronic systems of foreign cars will have to be reflashed for repair;
• on some machines it will be easier to find the problem and fix it than to disable anti-lock;
• you need to keep in mind that this system is not always the reason for the ABS light to come on, the problems can be different;
• during the diagnostic process, it is better to check the entire on-board electrical system and equipment.

Having laid out a certain amount for the inspection of the car, you can get the right answers to important questions. Sometimes a light bulb on the panel can turn into a full-fledged repair of important units and components of the car, so you will have to spend a lot. But in most cases, this problem is not so expensive to solve. The cost of repair work depends, of course, on the make and model of the car, on the price of spare parts. If an ABS sensor for a domestic car costs from 600 rubles, then a Japanese SUV will drag out more than 10,000 rubles to replace one such sensor. We offer you to watch a video about solving a similar problem using computer diagnostics:

Summing up

ABS problems are in any case not very pleasant incidents. It is better to stay away from various problems, try to operate the car according to the requirements and advice of the manufacturer. But sometimes this turns out to be impossible, so you need to have a good service in mind that can help in different situations. By contacting an official service center with this problem, you can become a victim of an overly scrupulous approach to diagnosis and receive huge repair costs.

However, sometimes the problem with the ABS sensor and the burning light of this system can be solved independently. Use the tips described earlier in the post to understand all the features of a particular troubleshooting method. We warn you that disabling ABS is completely impossible to do on your own. The on-board computer will either simply not let you start the car, or it will start behaving inappropriately, each time issuing new error codes of the diagnostic system. Have you experienced malfunctioning ABS sensors and a constantly on light?

Until the advent of "ABS" systems in cars in the 1970s, they were less safe when compared to today's modern cars. This was especially true of the moment when the driver had to move either on a wet or on a snowy icy road. In those years, old cars were usually equipped with not very high-quality wheels (tires), not quite reliable rear-wheel drive, as well as a conventional and simple braking system without any electronics. But today, as you know friends, everything has changed for the better. Today, most of the drivers do not even think about the modern braking systems on the machines. Today, each of us (drivers) feels confident and safe behind the wheel of a car, even when driving or specifically icy. It's all about the following. Most modern cars in our time are equipped (equipped) with front-wheel drive, which gives drivers confidence when driving a car. And what's more, these cars are also equipped with the latest modern electronic security systems that control the grip of the car with the road surface, and excellent modern rubber, which demonstrates some miracles of grip on such a track on a slippery road. One of the most important systems in any modern car today is the anti-lock braking system (ABS), which significantly reduces the stopping distance of the car and prevents the wheels from locking, which can lead to loss of traction and, accordingly, further skidding.

The "ABS" system has already become standard equipment in the automotive industry, it is now installed on virtually every modern car manufactured by automotive companies. As we have already written more than once, this "ABS" system consists of several parts, namely, speed sensors that are installed directly on the wheels of the car, an electronic control unit for an anti-lock braking system and also hydraulic valves, which, according to a certain signal from the electronic unit, - they also regulate a certain braking force in each wheel without resorting to the help of the driver (without his participation).

Wheel sensors "ABS" monitor the speed of rotation of each wheel of the car and constantly transmit data to the auto-computer. As soon as the ABS system unit begins to notice (see) that the wheel stops rotating, it immediately activates the hydraulic brake system valves and it, in turn, immediately begins to reduce the brake pressure in this very wheel. As a result, the pressure of the brake fluid in the wheel immediately drops and the braking force decreases, which contributes to further unlocking the wheel and returning traction. This process is repeated several times per second through the car's computer until the car comes to a complete stop or the driver himself releases the brake pedal.

The ABS control unit and the car's computer automatically perform a self-test of the anti-lock braking system every time the ignition is switched on. That is, every time you start the car, an automatic test of the "ABS" system immediately takes place. In the event that during self-testing the auto-computer receives insufficient data from sensors, from the ABS control unit and from the hydraulic valves of the brake system, the vehicle's warning light with the "ABS" icon lights up. For example, if the car's computer or the same "ABS" control unit did not receive a feedback signal from the hydraulic pump of the brake system or from the same valve installed on each wheel, then the signal "ABS error" will immediately light up on the instrument panel (on the panel), - in the form of an icon (indicator).

Friends, draw your attention specifically to that, namely, despite the malfunction of the "ABS" system and the appearance on the dashboard of its burning "ABS signal-icon" in the car itself, as a rule, the mechanical brake system continues to work and you can safely without fear to continue driving the car, but already without this electronic system to help block the wheels during braking. That is, in other words, we can say that if the ABS system breaks down, you can safely use your car. True, in this case, you must be extremely careful when braking on wet, snowy or slippery roads, because without this ABS system, the wheels of your car may periodically lock up. Therefore, friends, we do not recommend that you, in the event of a malfunction of the ABS system, operate your car without proper repair for a long time. Thus, it should be clear to all drivers that in the event that an "ABS system error" is issued by the auto-computer, it is necessary to establish the cause of this malfunction as soon as possible and eliminate it as soon as possible.

Malfunction of system "ABS".

And so let's say. In your car, there is a warning light or icon on the dashboard that alerts you to problems with the anti-lock braking system. What should be done in this case?

First, first you need to make sure that the indicator light on the icon indicates a problem with the "ABS system", and not a malfunction of the entire braking system of the car.

To do this, you need to carefully listen to your car when braking and turn your attention to the brake pedal. If during braking you begin to hear extraneous noises (whistling, knocking, squeaks, etc. sounds) or the brake pedal in the car has become too soft (softer than usual), then your task is to take a direct road to the technical auto center, where specialists must conduct a thorough diagnosis of the entire braking system of the machine. Please remember that all these signs indicate a serious malfunction of the entire braking system of the car, which can lead you to an accident while driving. So friends, remember, if your car's brakes have become very bad, soft and not quite normal, we do not recommend that you drive on a public road with such brakes, as this can be very dangerous. In this case, you need to call a tow truck.

Also, in order to specifically find out that the lit ABS symbol of the malfunction was the cause of the anti-lock braking system of the car, you also need to make sure that air has not entered the brake system of the car, that the brake pedal on the car is still hard, and has not become too soft, and also make sure that there is no brake in the brake system. To do this, you must first check the level of brake fluid in the tank, and then only all the brake pipes and hoses for depressurization or breakage.

Among other things, it must be remembered that when the ignition is on, when you see such an illuminated “ABS symbol” on the dashboard, you should never panic. Maybe this is just a common error of the car's electronics itself. Therefore, in such a situation, it is necessary to turn off the ignition and remove the key from the lock, and then turn on the ignition again and check again if the “ABS symbol icon” appears again on the tidy (on the panel). You need to repeat this process several times. It is possible that this is indeed a car computer error and after several such ignition on and off, this ABS system error will simply disappear.

If, nevertheless, after several attempts to turn the ignition on and off, this ABS system error on the dashboard does not disappear, that is, it does not disappear, then you have two options:

First; - go to a car service and conduct a thorough computer diagnostics of the entire car. The main feature of the diagnostics of the "ABS" system is as follows, that is, in the electronic polling of the "ABS" unit using special equipment for all kinds of errors in its system.

With the help of such diagnostics, the specialist will be able to quickly determine the "code" of the error in the "ABS" system, which specifically led to the appearance of the signal "ABS symbol icon" on the dashboard.

Also, this very "error code" will give a specific clue where exactly to look for the cause of the malfunction of the entire ABS system.

The second option is needed only for those drivers who want to get to the bottom of this very truth on their own and on their own. In order not to use (not to use) expensive diagnostic equipment for testing the "ABS" system, you need a service manual for your car (a book on the repair and operation of your car model), as well as a simple car tool that is sold in any car shop and, of course, a multimeter with high resistance (high impedance). If you cannot find the necessary repair book for your car model on sale, then please look for it on the Internet or download it to your computer or smartphone.

We draw your attention to the following friends, that in some cars you can get direct access to the diagnosis of the same "fault codes" that are stored in the car's computer, and all this without using a special diagnostic scanner. To do this, you need to check each electronic unit of your car (including the "ABS" control unit) using the old proven method, namely, using two simple wires that you must connect to the appropriate connectors of the car's electronic systems. For example, you can connect these two wires to check the continuity of the circuit in the same "ABS" control unit, for which you need to connect these two wires directly to the connector of the "ABS" control unit and short the wires with a pin or a regular paper clip. If, after this procedure, the "ABS symbol symbol" error from the dashboard disappears, then the cause of such an error is located in the anti-lock braking system control unit itself. In the same way, and in the same way, other definite and necessary contacts can be connected with a paper clip or a pin and without the use of wires.

If, dear motorists, your car is equipped with a more modern computer, where error detection is diagnosed only by connecting the scanner to the "OBD II" (On-Board Diagnostic) diagnostic port, then in order to establish the reason for the "appearance of the ABS symbol icon" on the dashboard, you you only need electronic diagnostics, which you can do either at a technical center or yourself, but with the help of an inexpensive error scanner you bought to the "OBD II" port.

Assume the following, that you do not yet have any information about the errors in the car's computer, which led to the appearance of the "ABS symbol icon" on the dashboard. Do not rush to carry out computer diagnostics. First, check the fuse for the ABS control unit yourself. Indeed, a common cause of a malfunction in the operation of the ABS system is the usual fuse of the anti-lock braking system control unit.

And so we follow further, you checked the fuse of the "ABS" control unit, which turned out to be in working order. What to do now? And now you must use a multimeter to check the voltage and resistance in all electronic parts of the ABS system. To do this, read the manual for the operation and repair of your car, namely, with all the corresponding control values ​​\u200b\u200bof the voltage and the corresponding resistance in the ABS sensors and in the ABS electronic unit itself.

True, we must not forget to check the main wiring harness that is connected to the ABS control unit before this. Carefully inspect the entire wiring harness responsible for the performance of the entire ABS system for damage. Also, remove this wiring harness connector from the ABS control unit and carefully inspect all pins in the connector for contamination or oxidation. All contacts on the wires in the harness must be clean. If the contacts need to be cleaned, then use a special aerosol spray for cleaning electrical contacts and connectors to take and clean the connector from this contamination.

Also, when inspecting the contacts of the ABS harness connector, pay attention to the corrosion of the contacts. Please remember that even microscopic chemicals of oxidation and corrosion can seriously affect the resistance in the electrical circuit of the ABS system. As many people know, a small voltage of electricity (millivolts) is transmitted through the wires, and even the slightest increase in resistance due to contamination of the connector contacts can lead to malfunction of the entire electronic part of the ABS system, as well as cause an error in this system, which leads to "ABS" indicator light on the instrument panel.

If the ABS system controller looks intact and is in working order, and disconnecting the ABS harness connector from the anti-lock braking system unit did not solve the problem of the burning "ABS symbol icon" on the dashboard, then it is time to check the operation of the speed sensors wheels, which transmit information to the ABS control unit. To do this, you must initially measure the resistance of these sensors by comparing them with the control values ​​\u200b\u200bspecified in the repair manual for your car.

If this resistance is within acceptable limits, then proceed to a visual inspection of the wheel speed sensors themselves, the wires themselves suitable for them and to the inspection (inspection) of the condition of each axis of the toothed gear (or on each wheel hub), which are installed in the car on each wheel . As a rule, such sensors related to mechanical sensors were installed on old cars.

Also, today, many modern cars currently use sensors that need to be powered by electricity. As a rule, "ABS sensors" are used based on the "Hall effect" (a semiconductor plate is installed inside the sensor), which, when interacting with a magnetic ring on the wheel hub, record the change in the magnetic field itself and the rate of electron formation on the plate inside the "ABS sensors".

Unfortunately, not in all cars these "ABS sensors" and the wires through which the signal from the sensors is sent to the ABS system control unit are reliably protected from an aggressive external environment. They can eventually fail due to damage and dirt getting on them.

In order to check the condition of the wheel speed sensors and the wires of the "ABS" system, it is necessary to first remove the wheels from the car, namely, alternately raise the car with a jack from the desired side and remove each wheel.

So you get free access to the sensors and wires.

If, when inspecting the ABS wiring harness and wheel speed sensors, you find any damage (or the wheel speed sensor is not securely fastened or it is loose), then you can assume that you have found the cause of the error on the dashboard, which informed you about the malfunction of the ABS system.

But if, when examining these wires and "ABS sensors", you did not find any external damage on them, then remove all speed sensors of the "ABS" system from the hub (or from the axle) and check their resistance, as we have already said, using a multimeter ( if you haven't already done so). The control resistance values ​​​​in the wheel speed sensors can be found in special books for the repair and operation of your car model.

We also advise all car owners to inspect the ABS wheel rotation sensor wires from time to time, do this even if the anti-lock braking system of the car is working properly and the ABS symbol icon does not light up on the dashboard. The point here is that all the wires and wheel rotation sensors are located at the bottom of the car and they are constantly exposed to aggressive environmental influences. Remember friends that the main enemy for wires and sensors is salt, which is contained in the road reagent, in water and in snow.

For what reasons does the "ABS" indicator on the dashboard light up if the sensors and the control unit with the "ABS system" wires are working?

If, after testing, you find that all the electronic parts of the “ABS system” are in good condition, and the “ABS symbol symbol” on the dashboard is still on, then most likely the problem itself is related to the hydraulic valve system of the “ABS system”, which unfortunately not subject to partial repair.