Car rear window heating often fails. In most cases, it refuses not completely, and fragmentary: individual zones or heating threads do not work. To replace in this case the glass is completely irrational.

There are various ways of self-repairing threads and other elements of the heating of the rear window of the car in order to restore their performance. Consider them in this article.

Principle of operation

The heating of the rear window of the car occurs due to the heating of special filaments deposited on the glass when direct current flows through them. The threads are made of a conductive material of low resistance. The total current of the rear window heater is about 10 amps. The number of threads is about ten. Thus, a current of approximately 1 amperes flows through each thread. It is easy to calculate according to the law of Ohm, that the resistance of the thread is about 12 ohms.

The nithe of the heater is applied with the technological process of manufacturing the rear window at the factory in several ways:

• electrochemical;
• vacuum spraying (the most reliable method);
• sticking.

The chemical composition of such threads may include various elements, alloys and composite materials: resins, copper, graphite, nickel, chrome, tungsten. The manufacturer does not declare production technology, so for each technology (heated glass) you have to select the appropriate way to restore performance.

For example, a soldering is practically impossible if the threads were sprayed in vacuo carbon composition. In this case, only conductive adhesives are effective.

Connection scheme

Usually, the rear window heating thread is supplied to the battery voltage through the fuse systems, switches and relays according to the scheme below.

In some models of cars, the rear window heating is possible only with the engine manner. For this, another blocking relay is provided. The fuse mounted on the heater power supply chain typically has a nominal value of more than 15 amps.

Signs of malfunction

The main signs of the heating of the rear window:

• does not turn on completely;
• turns on, but not all threads work (the most common case);
• works periodically.

Why the rear window heating does not work: reasons how to check out the place of refusal

If the heating of the rear window stopped working, but it works, but with interruptions, this may be due to the following reasons:

1. Fault of the electrical equipment of the car.

Finding a place of failure should be started with a fuse that serves a heater. If it is working, then check the switch (button) of the heater, relay, electrical wiring to the heater contacts.

The rear window heating switch button is checked using a multimeter. Its contacts are often tightened as a result of a large current. In this case, it must be changed.

One of the most likely places of malfunction of electrical equipment - a bummer (or paying) the place of attachment of the contact terminal to the heater. Repairs in this case is difficult. It is required to produce a soldering with the help of special solders and flux. It is also possible to glue conductive paste.

Often wiring is damaged at the place of crossing the corrugations, where the wiring from the body to the door of the trunk is located. An opening of corrugations is required, wiring extraction, searching for a broken conductor and eliminating the breakdown.

2. Ombol of the filament.

Such a malfunction may be associated with the removal of a sunscreen film, mechanical scratches on glass, natural wear.

Video - How to check the rear window heating by a multimeter:

To search for a specific location of the thread break, if it is imperceptible to the eye, you must use the multimeter. Its probes should be sharpened or connected with sewing needles. It is necessary to ensure reliable contact of the probes with the heater threads. First, the method is visual or tactile (touch), the method determines the faulty thread (threads). It does not heat up. Then the resistance is measured in extreme sections of the thread.

After determining the place of damage to the thread, it must be marked with a marker.

How to fix the heating of the rear window do it yourself

To repair the rear window heating, you should purchase a special conductive glue or ready-made heater repair kits. It is necessary to carefully read the repair technology, which should be described on the packaging or the attached instructions in Russian. The success of repair work is determined by strict compliance with the technology specified in the instructions.

Video - repair threads of rear window heating with their own hands:

Overview of sets and glue for repairing threads and contacts of heating rear window

Set Permatex PX 09117

The set includes:

• adhesive for threads 1.4 ml;
• contact for contact 0.8 mm;
• tassel for applying glue;
• template;
• sandpaper;
• napkin activator;
• alcohol napkin.

Mode of application when repairing contacts:

• clean and degrease the surface;
• clean contacts;
• wipe the activator of the surface, wait 5 minutes;
• apply a small (!!!) drop of glue so that it does not make the surfaces bonded;
• press contacts;
• give a day drying.

Mode of application when repairing thread:

• degrease the surface to which the thread will be applied;
• attach pattern;
• wait 20 minutes;
• repeat the application of 3-4 times at intervals of 20 minutes;
• the heater is included in 24 hours.

The cost of such a set is about 1000 rubles.

AVS A78358S glue

Such conductive adhesive for repairing rear window heating yarns 2 ml costs about 200 rubles.

Conductive adhesive for repairing rear window heating threads.

The price of glue is about 400 rubles.

Video - How to glue the contacts of the rear window heating without removing the glass:

Repair technology is approximately the same for all industrial manufacturers. The main thing is to degrease the surface well and do not rush. If you cannot find special compounds for repair, you can try them to make them yourself or use other recovery methods.

Independent manufacture of conductive glue, soldering with special fluxes, electrolytic coating

1. Independent manufacture of conductive composition.

As the basis, the common glue BF-2 or BF-6 is often chosen. You can use other quick-drying adhesives. There are options for using a polymer resin, paint, enamel. In order to make a conductive paste from these materials, it is necessary to add a fine chips into it in a ratio of 1 to the 1st. The chips can be "mined" with a small file or supphilyla and copper, aluminum or brass material. After mixing the components, they are applied to the prepared surface through the homemade stencil. It is not difficult to make it with the help of construction tape or tape.

The effectiveness of such a self-made composition will not be worse than purchased.

2. Soldering the place of breaking thread and disconnecting the terminal.

The soldering place of the thread break is impossible if the distance between the end of the thread is more than two millimeters. In this case, you can pre-use the electrochemical method. When restoring the contacts of the connections of the heater terminals, the soldering is more efficient and reliable. The soldering is produced by a classic method using an active flux and solder. As a solder, choose POS-18 or similar. Flux is better to use a TC type based on zinc chloride.

3. Electrolytic coating.

To carry out such a coating, a solution of copper sulfate is required (the proportion is 100 milliliters of water, two teaspoons of copper sulfate, you can add a few drops of rechargeable electrolyte), rags, thread, stranded copper wire with a cross section from 6 square meters (for the manufacture of a copper bruster prototype).

Next, the copper brush from the stripped conductor wrapped with rag and thread is connected by the reverse end of the wire to the power supply of +12 volts (AKB), minus the battery is connected to the body or directly to the heater terminal. Bruster wetted in homemade electrolyte. After that, a moistened tassel is vigorously water at the site of the breaking of the thread. The processing place is gradually covered by the electrolysis process with copper particles.

If the heating of the rear window of the car is not working in the winter period, visibility is significantly reduced, undermining the safety of the driver and passengers. That is why when identifying a malfunction should immediately do repair.

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How does the heating of the rear window work?

All circuits of heating rear window auto are similar and practically do not have significant differences among themselves. AvtoVAZ models, as well as imported cars are equipped with the same type of construction and the principle of functioning. Thin tracks are applied to the surface of the rear window - conductive threads. Passing electricity forces them to warm them. From the outside of the glass there is a rapid melting of snow and ice, and the inner part of the surface gets rid of fogging.

Scheme of heating

Before detecting malfunctions of the device and try to eliminate them, you should familiarize yourself with the heating scheme and deal with the components necessary for its stable operation.

Auto rear window heating circuit

Deciphering the scheme:

• 1 - conductive threads;
• 2 - indication on the instrument panel;
• 3 - button on / off;
• 4 - Ignition Castle;
• 5 - relays;
• 6 - Mounting block.

On the video you will learn how to repair the heating of the rear window yourself. The roller is provided by Experiment _ TV.

Possible malfunctions of the device

If the heating of the rear window does not work, then one of the above components fell out or an open circuit occurred. You can check all nodes of the heating device yourself if there is at least the slightest idea of \u200b\u200bthe repair of machines. Below in detail we consider the causes of the malfunction of each node.

System fuse

Initially, when heated problems occur, make sure that the safety element is integrity. Its burnout will affect the device performance. Each automaker in its models accommodates this fuse in different places. To quickly find its location, it is recommended to use the instruction manual for the car or service book.

It is necessary to remove the found item and check for suitability. The blurring fuse should be changed to a new one, otherwise further attempts to search for glass heating faults will be meaningless.

Relay

One of the reasons for the failure of glass heating can be a relay fault, this element is located in the mounting block. The relay turns off the heating when the motor stops working. This device is not subject to recovery, so it is changed to the new one.

Wiring faults

If the fuse and relays are in good condition, the diagnosis of electrical wires is required. They probably broke, burned out or cut off at the place of attachment. In this case, the heating strips will not receive voltage.

Test the condition of the nutrient electrical conductors like this:

1. You need to turn on the heating button.
2. Using a multimeter, check the voltage on the first and second terminal for connecting the wires to the "tires" of heating. They are located at the bottom or on both sides of the glass. The absence of stress is the cause of the inoperability of the heater.

The first thing you want to take in this case is to clean the contacts of the terminals and all the plots of the connection, they can oxidize and do not pass the current. If the tester still gives "0", it means somewhere in the wiring there is a break. A visual inspection of the entire path of electrical caps is performed. Finding suspicious or damaged areas, you need to connect them, since in these places, it may have occurred.

Thread

Heating stripes are also affected by damage. Before looking for a problem area, you should read directly with the workflow in the threads.

The voltage supply is carried out on the entire heating node and dispersed evenly for each parallel to the connected tape. As a result, these tapes perform the role of electrical conductors. Due to the resistance heats up to a small temperature, which is enough to remove ice and snow from the glass surface. If the integrity of one of the threads is broken, the electric current will stop circulating according to it, the heating of this glass area will not be performed.

Night integrity disorder

Controls

When you click on the button, the indicator that is notified about the start of work should light up. If the switch is activated, the indicator is lit, and the heating still does not occur, it means that the contacts of the buttons came into disrepair. As a result, the supply of electricity to the heater is not carried out. The wired toggle switch is not repaired - you need to install a new one.

Repair of heating with their own hands

The most common cause of non-working heating is damage to thin conductive threads. Modern technologies allow you to restore the sections of the cliff of these threads with their own hands without attracting specialists.

Search Fitution Cliff

First you need to find damaged strands. The process will not take a long time, as the cliffs are excellent noticeable with the naked eye. Multiple damages are extremely rare, which are difficult to see, in this case you need to use a voltmeter.

The thread has a resistance of 10 ohms, its voltage is specified on each site. In the first - tension equals twelve volts, on the third - already six, and on the fifth - zero. To search for the cliff, the voltage in the center of each element is measured. If there is damage, the multimeter will give 12 or 0 volts, it is clear from here that a break from the left or right side of the thread.

Troubleshooting the heater using copper solution

To work, you will need:

• sulfuric acid;
• copper rod, diameter up to 10 mm;
• copper sulphate;
• tissue band 50x30 cm;
• scotch;
• scissors;
• glass cleaning agent.

Repair damage to the conductive threads are necessary like this:

1. At the first stage it is important to prepare a surface with damage to restoration work. To do this, use the rag moistened in alcohol and wipe it glass. When the dirt is completely removed, degrease the surface.
2. We glue the tape on both sides of the conductive thread at the break point. Sticky tape is fucked so that the width between the strips corresponded to the heating thread.
3. Copper rod from one end is winding with a cloth. The so-called brush is fixed with threads.
4. Copper solution is prepared. Half of the glass of water is thoroughly mixed with two teaspoons of copper sulfate. A slightly concentrated sulfuric acid or electrolyte from car batteries is added to the resulting liquid.
5. Terminals from the heating device are connected to the mass. The wire from the "positive" terminal of the battery is connected to a previously made tissue of a metal rod.
6. The resulting electrode impregnated in solution is thoroughly rubbed the sections of the torn threads. The ends of serious cliffs are pre-processed using an electrician. They also establishes a binder jumper from the finest wire. As a result, slightly damaged areas are tightened with copper.

Troubleshooting the heater with a conductive adhesive

Conductive glue is a specialized pasta, which includes a fine powder palladium, as well as nickel gold or silver. Thanks to the elements listed, this substance perfectly conducts current and is characterized by good connecting properties. The process of restoring the heating threads of feed glass with a conductive adhesive is faster and more efficient.

To proceed to restore threads, we perform the same procedures for cleaning the glass surface and the damaged area of \u200b\u200bthe tape. For the preparation of conductive glue in repair kits, two substances are provided that should be carefully mixed in a separate container. How to prepare the composition and further use it for the purpose is written in the instructions on the package.

The application of glue occurs with a brush or cotton sticks, the size of the layer should not exceed 2 mm. The average time of pouring the conductive composition is 30 minutes. After 24 hours, we remove the excess substance, this is done using a knife or any acute subject.

When removing excess conductive adhesives should be used extremely gently, otherwise the surface of the heating device will be damaged again.

Video "Repair threads of heating rear window"

Detailed explanation of the repair of heating threads. The roller is taken from the channel "Logbook Renault Megan".

The car windows should not only perform protective functions, but also ensure driving safety. To save the road overview, various additional adaptations are installed on the glasses. For example, on the rear window, they mount a special heating system that does not allow it to freeze and helps to quickly clean from snow and sleep in the cold season, as well as on fogging.

To begin with, let's deal with what is the heating system of the rear window of the car. This is a special grid made of high resistance material that conducts current. It is applied on the glass from the inside of the machine on the rear window.

Important! In the dark, the applied mesh changes the view from the rear view window. Metallic threads reflect the headlight light on the back of cars, creating glare. It distracts a bit from the road and can cause a crash.

On different cars, the heating system may differ slightly, but in principle it is approximately the same for all models. It includes such key elements:

heating element of the heating system of the rear window;

Warning lamp that signals the inclusion of the system;

System Switch;

Ignition switch;

Mounting block.

The system is driven by a working condition only when the ignition is enabled. To enable the system, you must press the appropriate button. It is supplied to it through a special relay. After switching on, another relay is heating, connecting the heating element. As soon as it starts to work, the heating indicator test lamp turns on.

The heating element itself can be performed in different ways. But, as a rule, it is made in the form of a grid of thin nickel threads. They are connected to the conductive tires that are located on the glasses sides. Each of the tires on one side takes a voltage current of 12 V, and on the other hand closed for mass.

The threads themselves are attached to the glass with special glue. Sometimes the glass is first covered with an inventory, say, aluminum, and the mesh is fixed on top of glue and cover it with a light film.

What parts and tools need to be prepared for installation of heating

As can be seen from the structure of the heating system, equip the homemade heating of the rear window is quite simple. To do this, you will need:

Actually rear windows;

Electric heating threads;

Approximately 5 meters of blue wire and 7 meters of red;

Switch / switch;

Pads;

Relay (4 contacts by 30 A);

Heat shrink;

Round-shaped precipitated contacts for a bolt pin;

Terminals ("Mom", "Dad").

To install the system, you will need such tools: insulating tape; pliers; Passatia; screwdriver.

Important! The filaments are rather thin, so they are subject to mechanical damage. It is necessary to work with them extremely gently so as not to damage at the installation phase. Any external impacts after installation can also lead to a thread rupture.

Steps of the heater installation

The question is how to connect the heating of the rear window is solved in two stages, especially if the work is carried out in the cold season. Initially, it is necessary to collect workpieces. You can do it even at home, and only after that go to the garage to the machine to install the collected system.

Collection of workpiece

This is the shortest stage. Initially, we take the pads, and if wiring is installed on them, remove them. Circling the wires with contacts "Mom", fold a new block. After that, it is necessary to fold the relay, roasting the ring connector. We make the wire that will be connected to the body of heating.

Installation of heating in the car

Now you can proceed to the installation itself. To do this, remove the dashboard and pads. Be sure to remember their location to then install in the same order. To prevent short circuit, you need to remove the battery terminals in advance.

Determine where you will stand the switch and relay. Connect power, swipe the wires to the fuses under the dashboard. Find a fuse at 16 A and connect a positive wire to it that comes from the relay. The wire from the switch with the "+" sign must be connected to the fuse on 8 A. All these wires are fixed on the overall wire beam. Gently remove the switch from the dashboard and connecting the block, insert it back.

The final stage is the conduct of wires to the glass that will be heated. The wire with the "+" sign is locked where the driver is comfortable. Practice shows that its most convenient location is with the main beam of wiring.

Now you need to form a "mother" and isolate wire ribbon. After that, it is necessary to connect with the housing of the racks and the body minus heating wire. Then you can set the panel, mats and connect the battery.

During the installation, the question often arises than to glue the rear window heating terminal. Ideally solder her rosin or acid. But this work requires some skills. If they are not, the item can be glued with special conductive glue. As a rule, it consists of silver chips with hardener and epoxy glue.

Did you know?Conductive glue on silver can be made independently. To do this, it is necessary to mix in equal parts of a 1% formalin solution with nitric acid silver, and then add five drops of 5% of the ammonic alcohol to the mixture. The resulting black silver precipitate should be removed using distilled water and filter. The mixture is dry at a temperature of 105-150 ° C, where the filtered powder is added then.

Before installing the terminal to the foil strip, the strip is sanded from all sides, detectable. Sutting to her terminal, the other side is smeared with glue and pressed to the desired place on the glass so that all the extra glue came out. This guarantees good contact. The glue dries during the day. At this time, the heater is not recommended.

How to check the installation of heating

After installing the system, the following question - how does the heating of the rear window work? To find out how good the manipulation described above, it is necessary to turn on the ignition, then heating and wait approximately 5-10 minutes. Then inspect the glass for the effective operation of the system.

If the installation has passed not very successfully, may not heat separate threads. In winter, it may be noticeable when weft, which does not melt. In the warm season, you can check the rear window heating threads with a tester. With it, you can determine the integrity of the thread. If it turns out that there are gaps on it, it must be replaced.

Did you know? Most often, an ohmmeter is used as a tester. But today this unit goes into the past, and instead it uses a more universal device - a multimeter.

If the system does not fully work, that is, no one thread is heated, there may be such problems:

faults in the fuse;

Fault switch;

Tips are poorly connected;

Malfunction in wires;

The contact of the heating element of the glass is not connected.

As you can see, the question is how to make the heating of the rear window, is simply solved. First you need to collect the entire system, and then connect it in the correct sequence to the rear glass. The process is quite simple and can every car enthusiast can cope with it.

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The heating threads on the rear window of the car may fail after the expiration of the long life of the machine or due to mechanical damage. As a result, the car drivers face the lack of heating of the glass. This causes condensate on it with significant temperature differences inside the cabin and on the street in the cold season.

Poverty glass significantly reduces the visibility of the road surface, which is fraught with an increase in the risk of an accident. This problem, fortunately, can be eliminated with your own hands using a special glue or pasta.

Repair the rear window of the car

Heating a piece of car glass stops due to the cliff of the thread, which you, for example, can hurt the abrasive, removing glue from the toning film. Since heating elements are thin and with certain lighting almost not visible. There are several ways to detect the cliff:

• On the glass that has already fallen, turn on the heating (in some models, the car is enough to start the engine). Watch that the break place remains duver, whereas the rest of the window turns the stain.

Search for a cliff of the rear window heater

• Turn on the ignition of the car while simultaneously activating the heater on the window. Next, take a voltmeter, connect one probe to its weight with a mass of the machine, and the second wrap in foil. You will need to move it on the conductor of the heating system. In the center of each thread, connect the appliance probe: if it shows the voltage of about 5 V, then the item works properly. If the indicator ranges from 0 to 12 V, then the gap is observed. After determining the element in which there is a gap, detect the place of deformation by attaching the probe to the device to the positive terminal of the heating system. The second probe move across the heating element: in what place the voltage will be 0 V, there is a gap.
• Take a kilo or megaommeter. One of the probe to attach to one conclusion of the car heating system, and the second to the second exit. Moch your cotton in distilled water and spend it on the heater element. Where the arrow of the Ommeter jerks, there is a breakdown. Use analog Ommeter. Note that it will show the correct data if the cliff on the heating element is only one.

Finding the floor of the heater cliff

Methods of repair

Before you start repairing the rear glass heating with your own hands, make sure that the current strip is cleaned from varnish. It is necessary to do this extremely gently using a clip. After cleaning, degrease the working surface.

There are several ways to repair the car window heater:

• Conductive paste. To use it, turn off the windows heater and give glass time to cool. After cleaning the threads, mark the workplace markup, and then apply the paste with a layer of about 2 cm for each of the damaged ends of the heater element. The paste dries within 24 hours, during which the wind heating cannot be enjoyed. However, drying with a construction hairdryer is possible to accelerate the process.

Conductive paste for car heating repair

• Paint with chips. Take the copper bar with brass or graphite and erase it with a small file in the chips. Paint you will need to the color of the threads. It must be mixed with the resulting chips 1: 1. You will have a mixture of a tough consistency. After switching on the heater, the paint is applied to the place of the thread break. The deposit place is pre-placed by the tape. When you draw paint, hear the hiss that will soon disappear. After that, the thread will start working. The composition itself freezes for a minute.
• Prepare small chips from iron, magnet and colorless glue (lacquer fit). Magnet attach from the outside of the car above the breakdown seat. After the filament of the heater, pour sawdust. We move the magnet and in such a way to move the chips to the right place. The procedure is completed after the thread starts heating. To secure sawdust on site, apply a drop of glue or varnish on them. Then remove the magnet, removing extra sawdust.
• Conductive glue. It is considered one of the easiest ways, as alone (without sawdust) provides current. The glue selling in a set with stencils and brush is applied to the place of the cliff of the threads using a syringe or brushes. You must overlap the whole of the thread of 1 cm on both sides. Dries to the remedy about a day. Some users believe that a little iodine should be added to the glue. It will paint it into the red heaters. Reviews about conflicting means.

Conductive glue Keller

• Glue and sawdust. Nitroles suitable to be mixed with silver sawdust and put on a damaged surface. After the mixture it is crushed, and is deleted too much.

Adhesive manufacturers

Current glue manufacturing such manufacturers whose products you can celebrate on the market:

• Keller.. Releases Kontaktol, in the set with which the smallest particles of silver are contained. It is represented by a one-component mixture, low-cell, hypoallergenic, waterproof, heat-resistant;
• Loctite.. Sold in a stencil set, applied with the help of a brush-running;
• Russia. Releases "Contactol", which is applied to the surface with a layer of 0.2 mm. Withstand temperatures up to +110 degrees. It has low elasticity and has water resistance.

If you are reading this article, then the heating of the rear window is definitely it is an indispensable function of your car. Nevertheless, for many decades, drivers were forced to ride without heating the rear windows. From the thermal functions of the brake of the car was only the very warm air that blends from the ventilation holes at the base of the windshield, but this, of course, it was not enough so that such air could dry and warm the rear window in the rear end of the cabin. However, if you had children, you could give them a little cloth and give orders to make the rear window to be clean, but agree, this is not a very welcome perspective!

Then this curious grid of wiring threads on the rear window appeared. The button on the dashboard includes the system, and right in front of the fog (condensate) will disappear on it. Soon such a defroster became standard for the rear windows of most cars, and today almost all the cars are equipped with the heating of the rear window.

But, unfortunately, like everything else in your car, heating is also susceptible to breakdowns. And if it happened, then the first step that should always be done in troubleshooting is a clarification, why the rear window heating does not work before proceeding to one or another more specific and thorough diagnostic or repair method.

Repair the rear window heating thread

So, the repair of the rear window heating should be started with the search for a good kit for repairing heating, which, in general, is very primitive and consists of directly conductive means (glue, varnish, etc.) and brushes for its application (sometimes included Cancellation or tape can go for the border of glue. This set is sold in almost any auto shop, and when buying should pay attention to its color - it should be yellow-red, mustard or red - most often it is precisely such means for repair are the most qualitative and Reliable. In any case, you better choose glue from those that the same color that also applied to your rear window.

The second - the price of a set of means for repairing rear window yarns should be at least 300-400 rubles - here is exactly the case when quality depends on the cost.