How to break the heated rear window. Rear window heating not working

At any time of the year, the driver needs a properly working car. And sometimes some details are considered not so important, but according to the law of meanness, they will be needed in difficult times. One of the troubles that can happen to a driver on the road is damage to the rear window heating system. Both in winter during the period of cold weather, and in summer in rainy weather, this function of the car must be performed in full. Otherwise, humidity will get into the cabin, and visibility is reduced to the limit, as a result, the driver is forced to repair the rear window defroster of the car.

Heating system and functions

The heater is powered by electricity. It is known that warm air currents affect the windshield, special heating elements are needed for the rear. It's no secret that the inner side of the rear window is equipped with metal tracks that have a high resistance to electric current. When current flows through the ribbons, heat is released and, accordingly, heating occurs. The result is obvious: clear, dry, heated glass.

The main function of this structural element is to combat icing, moisture and fogging. As soon as the system starts to work, after a short period of time the glass is clean and transparent. In addition, this function allows you not to overdry the air in the car.

Damage to the heating system

As a rule, the driver notices damage in this part of the car only when the rear window is constantly sweating and does not get rid of ice. After turning on the heater, ideally, after a couple of minutes, it should be transparent and clean, but if this does not happen, then damage or malfunction has occurred. Among the damage to the system should be highlighted:

• Slow glass fogging. If visibility does not improve after a few minutes of heating operation, there is a malfunction. The reason may be hidden in the loose contact of the circuit connector.
• The inability of the heater to work when it is turned on. In this case, after pressing the indicator is not lit. This may be due to a faulty key or a blown fuse.
• The presence of horizontal lines of fogging on the glass. As a rule, such a malfunction can occur due to a break in the heating filaments that are applied to the glass surface.

Slow glass fogging

Whatever happens, the main thing is to make the correct repair of the rear window heating with your own hands or with the help of a specialist.

Fault detection and repair

It is believed that it is quite simple to determine the damage in the heating system, and every driver will cope with the task. Before starting work, it is recommended to count the threads applied to the glass, so that later it will be easier to remember which one is damaged. There are cases when the gap cannot be seen: it is so small that one of the instruments should be used. It can be a voltmeter or a multimeter. In any case, in order to repair the rear window heating filaments, you need to carefully examine the surface and identify damage.

There are several effective ways to troubleshoot:

• Method of visual diagnostics - in damaged areas, when the heating is on, the glass does not warm up and remains misted.
• Using a voltmeter - with the heater turned on, one probe should be placed on the "mass" of the machine, and the second, wrapped in foil, placed in the center of the thread. It is necessary to monitor the voltage, its indicator should not exceed 5 V. If the device shows 0 or 12 V, then there is a gap in this place.
• With the use of an ohmmeter - the device turns on in the “kiloohm” mode and is connected to the opposite terminals of the heater. You should moisten the cotton wool and draw along the thread. In the place where the arrow will twitch, and there is a gap.

Definition of malfunction of heating of back glass

You can repair the heater in a variety of ways, for example, purchase a special kit for repairing rear window heating filaments.

You can fix the system using a repair kit, conductive paste and folk methods. The main difference between all options are the materials that are used during operation.

Repair materials

By purchasing a repair kit, the driver has the opportunity to repair the heating filament up to 10 cm. Materials used in these kits:

• pattern with threads;
• thermally active polymer resin in a can.

Materials for repairing heated rear window

Work is carried out strictly with the heating system turned off. Having determined the place of damage, it is necessary to remove the protective film from the template and attach it to the found place. The polymer material is applied with a brush, and after drying it is repeated several times. After completing the work, the stencil is removed and it is advisable not to turn on the heater during the day.

In the case of using a conductive paste, you may only need a building hair dryer, which speeds up the drying of the material.

The materials used in the "folk" methods of repairing the heater are paint (glue) and shavings, metal for soldering the damaged area. As a rule, the paint is selected in accordance with the color of the threads and combined with chips, adhering to a 1: 1 ratio. To work, you need a stencil on which the mixture is applied (with the device turned on). The advantage of this repair method is that there is no need to wait for drying during the day. The driver can immediately go after the work is done. Zinc chloride is suitable for soldering.

How to restore heat with glue

Quite often, drivers use conductive adhesive to repair the heated rear window. The material is mixed with shavings, which are mined with a file or a copper-brass bar. The ratio is 1:1. The result is a soft dough consistency. Using electrical tape or adhesive tape, a stencil is made, and the prepared mixture is applied to the site of damage. After the procedure, you do not need to wait for the materials to dry and you can immediately move on.

Heated Rear Window Repair Adhesive

What to do with contacts, and other methods

If the contacts were damaged in the heating system of this element of the car, then it is best to use the soldering method. This method is the most reliable and will help to forget about this problem for a long time. Zinc chloride works great. It is recommended to take solder with a minimum tin content. After completion of work, the glass must be rinsed well with water to remove chemical residues.

Heat recovery price

In fact, repairing the heater is quite simple and inexpensive. Using the "paint + chips" method, the driver will incur minimal costs by purchasing paint of the desired color (or using the available material) and preparing sawdust. If you buy a repair kit, it will be much more expensive. The cost also depends on the manufacturer of the conductive adhesive. It can be a well-known and expensive company Keller or a cheaper manufacturer - Loctite. An alternative would be the glue of a Russian company.

If you are reading this article, then rear window heating is certainly an indispensable function of your car for you. However, for decades, drivers have been forced to drive without heated rear windows. Of the thermal functions of the glass of the car, there was only the very warm air that blew from the ventilation holes at the base of the windshield, but this, of course, was not enough for such air to dry and warm the rear window at the rear end of the cabin. However, if you had children, you could give them some cloth and give orders that the rear window was always clean, but, you see, this is not a very welcoming prospect!

Then there was this curious grid of wiring threads on the rear window. The button on the dashboard turns on the system, and right before your eyes, the fog (condensation) on it will disappear. Soon such a defroster became standard on the rear windows of most cars, and today almost all cars are equipped with heated rear windows.

But, unfortunately, like everything else in your car, heating is also prone to breakdowns. And if this happens, then the first step that should always be taken when troubleshooting is to find out why the heated rear window is not working before proceeding with one or another more specific and thorough method of diagnosis or repair.

Rear window heating thread repair

So, rear window heating repair should start with finding a good heating repair kit, which, in general, is very primitive and consists of a directly conductive agent (glue, varnish, etc.) and a brush for applying it (sometimes included there may be adhesive tape or tape for the border of applying glue.Such a set is sold in almost any car shop, and when buying, you should pay attention to its color - it should be yellow-red, mustard or red - most often it is these repair tools that are of the highest quality and In any case, you'd better choose an adhesive that is the same color as the one applied to your rear window.

Secondly, the price of a kit for repairing rear window filaments should be at least 300-400 rubles - this is just the case when the quality is highly dependent on the cost.

Each car is equipped with a rear window heating device, which allows the driver in bad weather to have a complete picture of what is happening behind his car. But sometimes it happens that this device fails, from which driving safety is significantly reduced. How is the rear window heating repair carried out, how to do this procedure with your own hands? Find out below.

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Description of the rear window defroster

First of all, you need to figure out what the conductive heating of a car is, how the filaments of the incandescent film work and what kind of malfunctions are characteristic of it.

Device

Heated windshield or rear window does a good job not only of thawing ice in the winter season, but also of fogging in dry weather. Thanks to the filament film filaments, the glass can evenly get rid of the presence of ice while the car is warming up. When the air flow of the heater just starts to get warm, heating the windshield or rear will already make it completely transparent. A heater is the only effective method in combating fogging.

As for the windshield - its heating is carried out as a result of exposure to warm air. As for the rear, in this case the heater is a certain number of filaments on the film, installed on the adhesive, which operate on voltage. These filaments, which are characterized by high resistance, are installed on heated glass. Incandescent filaments mounted on glue conduct energy through themselves, which allows heat to be generated. Ultimately, when the button for heating the rear window is pressed, the filaments begin to heat up and completely heat it up.

Working principle and functions

If the heated rear window or windshield does not work for you, then in order to correctly diagnose breakdowns, you need to understand the principle of operation. Below is a diagram of the operation and connection of the heater with your own hands to the on-board network of the car. As you can see, power comes from the positive battery terminal through the ignition switch, as well as fuses, eventually going to the device controller and relay contact. As for the negative terminal, it is connected to the vehicle body, one of the heater terminals is also connected to the ground.

During the activation of the heater, the current begins to flow to the relay coil. After the relay is activated, the power contacts are closed, as well as the simultaneous connection of two terminals marked with the numbers 87 and 30. The voltage is supplied to the car heater, passing through the threads installed on the glue, connected to each other in parallel. After that, the voltage again passes through the mass of the car and returns to the minus of the battery.

Possible malfunctions and their symptoms

If the heated rear window does not work, then motorists usually find out about this when it starts to sweat or a coating forms on it. Turning on the heater function, you can wait a very long time, as a result there will be no results or the glass will be partially heated. You do not need to be a great specialist here to understand that the device needs repair.

Depending on the wiring diagram, the heater of the windshield or rear window of the car can be turned on both with the ignition on and without it, but usually it still works when it is on. Depending on the car, the windshield or threads installed on the adhesive on the rear window may only work after the engine is started. This helps prevent accelerated battery discharge (the author of the video is BortZhurnal Renault Megan).

It should also be noted that the device can operate on a current of 10 to 25 amperes, it all depends on the specific car.

So, if the rear window heating does not work, then there can be several types of malfunctions:

1. The system does not turn on. In the event that the lamp located on the button does not light up when the system is turned on, the problem is most likely either in the button or in the fuse. If the lamp is on, but the threads planted on the glue do not heat up, you need to check the relay. In some cases, the problem lies in the connectors connecting the device to the car's electrical circuit, so you need to check these elements as well. Diagnostics is carried out in accordance with the service documentation for the car.
2. If the rear or windshield fogs up slowly, especially during the winter cold, the essence of the problem may lie in the poor contact of one of the connectors, this needs to be checked. As a result, the resistance of the contacts will increase, and the voltage will be less powerful, respectively, the threads planted on the glue will warm up longer. In order to check this, it is necessary to use a multimeter and measure the voltage indicator at the terminals of the device. If there are differences in the readings obtained, then they should be no more than one volt. Otherwise, you will need to restore the heating of the rear window of the car.
3. There are horizontal fog marks on the windshield. is another type of error. One of the most common problems in this case is the breakage of the filaments in certain places. Usually, it is possible to check and identify such a breakdown without special devices, just by eye, since the auto glass in the place of the break will not be thawed or misted. It should be noted that even with a slight mechanical impact, the tracks are destroyed, therefore, when cleaning auto glass, it is necessary to carefully use a scraper. If you practice the transportation of oversized cargo, make sure that they do not rest against the rear window.

Diagnostics and repair

Ways to find a problematic thread

It is not so difficult to make repairs and diagnostics with your own hands.

There are several options for checking your own hands:

1. First of all, this is a visual check. If the auto glass fogs up, turn on the system. In the place where the break occurred, it will sweat almost immediately. In this case, the rest of the surface will not heat up. This do-it-yourself diagnostic method is the easiest.
2. Another option for checking with your own hands is using a voltmeter. You need to manually activate the ignition of the car and, accordingly, the heating system. One voltmeter probe must be placed on the mass of the vehicle, and the second is wrapped in food foil, after which it must be brought to the heating thread. When performing such a procedure with your own hands, you will notice that the voltage level is no more than 5 volts. If this indicator drops to 0 or increases to 12, a break has occurred in this place.
3. Another do-it-yourself diagnostic option is with the same voltmeter. One voltmeter probe is connected to the plus of the system, and the second must be moved along the filament, from the minus side. Where a break occurs, the voltage level will drop to zero, in which case repairs will be required.
4. The last do-it-yourself diagnostic option is using an ohmmeter. The probes of the device are connected to the minus and plus of the system. You need to take a piece of cotton wool and moisten it in distilled water, then draw it along the thread. When the ohmmeter needle starts to move, it will indicate a break.

DIY repair options

How to repair rear window heating at home? There are several ways:

1. Using a repair kit. In practice, repair kits usually have the same characteristics - they usually allow you to repair up to 10 cm of damaged thread. Such repair kits include the threads themselves, as well as a can or tube with a special polymer resin. To repair, you need to accurately identify the location of the break, and then turn off the heating system. Next, you need to remove the protective film and attach a new thread to the site of damage. Using a brush, apply polymer resin, repeat the application procedure after complete drying. Wait a day before using the system again.
2. For repairs, you can use a conductive paste - a layer of the substance must be applied to the place of the break. It should be noted that when applying, it is necessary to grab a few centimeters on each side, wait about a day after application. To make the paste dry faster, you can blow it with a building hair dryer.

Video "How to repair a heater at home"

A detailed do-it-yourself system repair procedure is shown in the video below (the author of the video is SAMODELKIN and GADGET +).

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Even 25 years ago, the rear window heater was considered almost a space technology, and its appearance on the fives and sevens in the export version caused furious delight among the wild owners of Soviet cars. Today, only a lazy manufacturer does not put heating filaments on the rear window, and this is no longer an option, but a standard equipment for all cars.

How does the rear window defroster work?

Heating threads are placed on the rear window of the car, some models have local heating of the windshield and rear side windows. The task of the device is to create a positive temperature on the glass surface, no matter what the temperature is outside. This will get rid of fogging, icing and provide decent visibility in all conditions.

As a standard, the rear window heating system consists of several elements. The composition depends on the model, but, for example, on Renault Logan the components are as follows:

• conductive threads
• control lamp on the instrument panel
• fuse in the common block
• power button
• contacts
• heater relay

The principle of operation is simple - the terminal from the conductive threads is connected to the on-board electrical system on one side, and tied to ground on the other. When current is applied to the filaments, they generate heat, heating the entire area of ​​the glass.

Rear window defroster video tutorial

Typical heater failures

Malfunctions in the system are visible immediately after starting the engine - if the glass warms up unevenly, as evidenced by uneven release from fogging or ice, then you need to look for a problem. Most often, a non-working thread causes incomplete warm-up, but if the whole system refuses to work, then you need to look for the reason:

• in violation of the contacts for connecting the block of threads to the electrical system of the car
• in failure of the control relay
• in the fuse in the electrical circuit

A non-working fuse is the easiest to identify - you can ring it with a tester, or put a known working one. If the heater does not start even now, consider the option with a relay. No one will disassemble and mess with the relay, it’s easier to immediately try to connect a working one. In the event of a fiasco, we are preparing to restore the threads or replace the rear-view glass completely.

Do-it-yourself heater repair

It is not advisable to change all the glass due to one burnt thread. Renault services do not repair threads, but offer to replace the glass completely, so such an act cannot be called rational. The procedure for restoring the heater is not complicated, does not take much time, and with the right approach, it will save a lot of money.

Search for a problematic thread and a break

Finding out which of the threads does not work is as easy as shelling pears - it simply will not warm up the glass in its zone, and you will have to tinker with determining the place of the break.

Each of the threads is connected to the lateral vertical buses in parallel, therefore, it can work independently of neighboring threads. If you managed to find the place of the gap visually, with the help of a magnifying glass - excellent. If not, then we need a voltmeter.

On the positive bus, the voltage should be 12 V, therefore, at the break point, the passage of current through the thread stops, and the voltmeter will show this to the nearest millimeter. To do this, you need to fix one probe of the voltmeter on the positive terminal, and with the heater turned on, run the second probe along the idle thread to the place where the voltmeter shows no voltage. The break is localized. In the same way, you can find out the place of the break with a car probe or an ohmmeter.

Troubleshooting methods

Do-it-yourself rear window heating repair can be done in several ways to restore the filament. The choice of method depends on the width of the gap and the material of the high-resistance filament, but the following will be the best options:

• Conductive pastes and adhesives. It is a simple, inexpensive and effective method. It can be safely used if the width of the cliff is not more than 1 mm. On sale there are several special kits for the restoration of threads. Their price ranges from $ 12, they are sold in every auto shop. The kit already includes paste, a syringe and accessories for stripping.
• Even cheaper will be the method of using conductive adhesive such as "Kontaktol" or "Elekont". In this case, it is enough to simply apply glue to the damaged area with an overlap of the problem area of ​​5-10 mm. If the glue is not fake, then such a connection can work for a very long time and not cause problems.
• Method of galvanic shrinkage of copper. The method is very good, but in the presence of a whole chemical laboratory. With your own hands in garage conditions, its use can only be considered as a bold experiment.
• Soft solder. Affordable and reliable method of filament recovery. The threads are soldered using the conventional soldering method. But there is one important nuance - in no case do not try to clean the place of soldering with sandpaper. This will only increase the gap width. The thread is simply degreased with acetone.

Conductive pastes and adhesives are an inexpensive way to repair heating

If the gap width is more than a millimeter, then it is worth reinforcing the thread with a tinned copper vein 0.2 mm thick. For repair, soft solder brand POS-61 is used. In this case, the heating thread itself does not need to be tinned.

Thus, in almost 10 minutes you will solve the problem of rear window heating and save on expensive replacement of the heater.

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When creating a passenger car, designers pay great attention to the glazing of the car. Glass plays an important role in the design of a vehicle. They protect the driver and passengers from wind, dust and dirt. They serve as a soundproof barrier that allows people in the cabin to talk without tension.

Visibility from the passenger compartment and the ability of the driver to properly control the traffic situation depend on their shape. To do this, various improvements are made on the glasses, including rear window heating.

The system that helps to clean the rear window from ice, snow or fogging is not very complicated structurally. The electrical circuit in general terms can be depicted as follows:

• C is a generator.
• E230 - OZS system switch.
• J519 - onboard electrical network control unit.
• Z1 - heating element of the OZS system.

Although there may be some differences on different car models, nevertheless, if we consider it in detail, then in principle it includes the following main elements.

1. Mounting block.
2. Ignition switch.
3. Heating switch ZS.
4. The control lamp signaling inclusion of OZS.
5. Heating element of the OZS system.

K6 - additional relay.
K7 - relay for switching on the OZS.
A - connection to power systems.

In addition, the system has fuses, terminals and wires connecting all elements into a single whole.

When the ignition key is turned, the OZS is turned on by pressing a button, to which power is supplied through an additional relay K6. At the same time, the rear window heating relay K7 is activated, the heating element is connected and at the same time the control lamp lights up.

The device of the heating element on the rear window can also be different. In the standard version, it is a grid of thin metallic nickel threads, which are connected by two conductive bars located on opposite sides. On the one hand, a current of 12V is supplied to the bus, on the other hand, the bus is closed to ground. Such devices are attached to the glass using a special adhesive.

On some car models, the heating element is applied to the glass using spraying, for example, aluminum. A thin film with good light transmission is attached on top of such a deposition using an adhesive that conducts current.

Troubleshooting in the OZS system

Having found signs that the rear window heating is not working, you must carefully check the entire electrical circuit of the car's OSZ system.

The first thing to check is the health of the fuses. So, for example, on the VAZ-2110, these are the rear window heating fuses F4 and F7, which are located in the mounting block. Their malfunction may occur due to a factory defect, a short circuit or a power surge in the on-board network. A defective fuse needs to be replaced, for which it must be removed from the mounting block.

Next, you need to check the terminal connections in the OZS system. During operation of the vehicle, all equipment is affected by strong vibrations. As a result, contacts may be damaged, or a terminal may become disconnected or loose.

You also need to check the heated rear window relay. Breakage of the relay is possible when a wire breaks in the working coil of this part or due to burning of the contacts, due to a factory defect or short circuit. To check it, the relay must be removed and checked with a tester. In the event of a malfunction of this part, a replacement with a working spare part is necessary.

It is also necessary to check the contact of the heated rear window. A conductive element is attached to the rear window with glue, which is a contact to which an electric current is supplied through the wires, which is transmitted through this contact to the heating threads.

In this place, a break in the wiring is possible or, due to the fact that the glue was of poor quality, the detachment of the contact element from the glass.

Quite often, a break or damage to the threads in the heating element on the rear window leads to the failure of the heating of the ZS. This is detected by visual inspection or instrumental analysis. Visually, only obvious damage to the thread can be detected by establishing a gap between the damaged ends.

It is possible that during some repair work on the car, mechanical damage was caused to the surface of the glass, on which the heating element was attached with glue.

However, the main tool in diagnosing this malfunction is a voltmeter or ohmmeter.

They make it possible to identify the area with faulty threads with high accuracy, even if this breakage cannot be visually detected.

The procedure for repairing a faulty OZS system

Having determined the reason why the rear window heating does not work, you can begin to repair this system.

1. If the fuses or relays of the OSZ system are faulty, then the faulty parts must be removed. Replacing them with new, workable labor is not. The main thing is that they are installed as indicated by the electrical on-board system diagram.
2. In the case when the culprit of the damage in the OZS system is the terminal connection, restoring the heated rear window is also not difficult. It is enough to strip the contacts in the terminals. You may need to replace the terminal box, but this also does not take much time.
3. If the adhesive with which the contact on the rear window was attached turned out to be of poor quality and delamination occurred, then in this case it is necessary to buy a new high-quality conductive adhesive. Remove the layer of old glue from the unstuck contact with a napkin with an alcohol solution. Then apply a layer of new connecting agent and glue the contact into place.

1. If a wire break is detected on one of the tires, it is necessary to solder this wire to the old place using the connection diagram. The procedure for this is as follows:

• remove the remnants of the old solder from the wire, stripping the end, in addition, it is necessary to clean the junction on the bus;
• using a brush, apply rosin paste as a flux to the cleaned surfaces of the bus and wire;
• apply solder containing three percent silver in its composition to the cleaned and rosinized core of the wire;
• solder the wire to the bus, while avoiding overheating of the surfaces.

1. Most of all, accuracy when repairing rear window heating with your own hands is required if a break is found in the conductive threads of the OZS heating element. To facilitate this work, special kits for the repair of this system are commercially available. To fix the corruption, follow the steps in the following order:

• in the area of ​​​​the gap, clean a section six millimeters long in each direction from the place of damage;
• wipe the cleaned area with a napkin or cloth soaked in alcohol or an alcohol solution;
• on both sides of the damaged thread, stick thin strips of repair adhesive tape or ordinary construction tape if there is no repair kit. Do not stick adhesive tape on nearby threads, in order to avoid damage;

• if there is a repair kit, then mix the hardener with a silver-colored compound, which, after application, will act as a conductive thread. After mixing, apply this composition with a stick or brush to the damaged area, closing the circuit.

• if there is no repair kit, then the role of a special mixture will be performed by glue that conducts electricity well, it can be applied with a brush, being careful;
• after repairing the damage, it is necessary to give time for the glue or a special mixture to harden; a hair dryer can be used to speed up this process;

• after the conductive strip has dried, it is necessary to carefully remove the self-adhesive tape, for this it is best to cut it with a knife at the junction with the repaired thread so as not to damage it when removing the tape;

• after the work performed, it is necessary to check the operability of the OZS, for which start the car engine and press the button to turn on the OZS.

See also video