How to check the heated rear window relay

Heated rear window VAZ 2110: device and repair

Icy rear window
Today, almost all VAZ models are equipped with a heated rear window, since it greatly simplifies driving; in specific conditions, owners of cars without heated glass install it themselves. Most often, of course, heating is needed in bad, rainy and cloudy weather, then the rear window begins to fog up from condensation forming on it, and even in winter, then the glass may become covered with ice. When such conditions occur, as a rule, problems with the heating of the windows begin to arise; we will tell you how to check the heated rear window of a VAZ 2110 and troubleshoot the problem in this article.

Relay

The most common reason why the rear window heating does not work on a VAZ-2110 car is the relay. Over time, it burns out and stops passing current normally. How to check this element for serviceability? You will need a multimeter. But first we check whether the relay is emitting signs of life. We turn on the heating button and listen to its operation. A working relay should make a characteristic click. If it is not there, we continue to search for the problem deeper. We pull the relay out of the mounting location and apply the probe of the device to one of the contacts. The second wire goes to ground (that is, to a bare area of the body). If the device shows “zero”, most likely the element needs to be replaced. It is because of the relay that the rear window heating does not work well. The VAZ-2110 is equipped with an element of the “K6” brand. It can be bought at any car store for a price of no more than two hundred rubles. If you don't have a multimeter, you can use a test lamp. It is important that it is 12 volts. We connect one wire to the “plus” of the relay. The second one is connected to ground. If the lamp does not light, then the relay is faulty. But contacts can also burn out, due to which the voltage will not be fully supplied. The light bulb will not be able to determine this. For more accurate diagnostics, experts recommend using a multimeter.

Operating principle of heating

The principle of operation of the heater is very simple - a conductive thread of strictly defined resistance is applied to the rear window, it heats up from the current passing through it. In this case, the supply voltage is provided by such components as wiring, a heater relay, a power button and a fuse (see VAZ 2110: how to replace fuses) A similar scheme is used on all VAZ cars (and on the vast majority of foreign cars), starting with the “classics” and ends with the latest models.

Malfunctions of heated rear window and their elimination

Let's look at the diagram in the photo below to make it clearer where to look for the problem:

Simplified diagram of rear window heating

The inoperability of the rear window heater is detected almost immediately, because when it works, the fogged glass begins to clear up, literally in the first minutes after it is turned on.
But when the heating does not work, then this does not happen, the glass was and remains fogged

Reasons why the heated glass may not work:

When the glass does not thaw at all and the signal light (also known as the power button) does not light up, there is most likely a problem with the heating relay activation control. Here you need to immediately check (see the diagram above) - the control voltage, as well as the ground (contacts 85 and 86 from the relay and contacts 1 and 9, as well as 2 and 4 located on the block), check the fuse on the F7 diagram, and button 4
If the heating does not work, but the control light on the dashboard (or located on the power button) is on, there is probably no supply voltage in the glass heating network. You need to check the presence of supply voltage (on pins 5, 30 of the relay, and 19 on the block), as well as fuse F4, measure the voltage and presence of ground on the heating element, as well as the integrity of this element
If the glass only partially clears (in stripes). Perhaps some heating threads have failed. To restore, you will need to find the damage (visible break in the circuit), then repair it using conductive varnish (glue) or use a special repair kit for this purpose
When everything works, the glass still does not thaw. This situation is quite possible in winter, or in cold weather, when the glass becomes covered with strong icing. Then the heating of the heater element is simply not enough, so the glass cannot thaw with its help. In such a situation, it is recommended to simply clear the ice from the glass.

Heated rear window of VAZ 2109 does not work

Heated rear window is a very necessary thing - it protects the rear window from fogging and icing. However, very often it either does not work at all, or only part of the tracks works. I think that many VAZ 2109 owners look at the road through the rear window when reversing. At least that’s how I do it – it’s very convenient. If this glass is foggy or covered in snow, then nothing will be visible. And driving by mirrors, especially when you are used to driving while looking out the rear window, is very inconvenient and scary. And safety when driving a car is important. It’s not very pleasant to drive in reverse, looking at the mirrors and wondering whether you’ll hit someone or not.

Heated rear window does not work

The operating principle of heating the rear window of a VAZ car is as follows: a conductive mesh is applied to the rear window from inside the passenger compartment. An electric current flowing through this mesh causes it to heat up, and as a result, the rear window of the car also heats up. The heating is turned on by pressing a button on the instrument panel. If the heating does not work at all, then you need to look for the reason why voltage is not supplied to the rear window mesh. Checking the presence of voltage for the heated rear window is simple: unplug the two wires connected for heating and measure the voltage between them using a multimeter.

We measure the voltage of the rear window heating

Naturally, before doing this, do not forget to press the heating button on the instrument panel.

Turning on the heated rear window

If there is no voltage, then you need to check the heating switch relay in the mounting block, the heating switch button, the condition of the tracks in the mounting block, the integrity of the fuse, and the integrity of the wires to the rear window. If the heating voltage comes on, but the glass still freezes, it means that only part of the tracks are working, or maybe none of them are working at all. To find out which tracks work and which don't, you need to turn on the heating when the rear window fogs up a little. Around tracks that are running, evaporation will disappear. We remember these tracks, or mark them somewhere so as not to forget. The remaining tracks around which the vapors did not dry out are faulty. There is only one problem with more expensive heated rear windows - they are torn. The track can tear spontaneously over time, and the track can also be scratched if something sharp or hard is rubbed on the rear window from the passenger compartment. A broken track can be detected by carefully inspecting each rear window heating track individually.

Broken heating threads

Heating repair will consist of restoring damaged areas of the paths. That is, it is necessary to eliminate the electrical circuit break and ensure the flow of electric current along all paths on the rear window.

A special conductive adhesive is sold that is perfect for such purposes. It is used as follows: glue adhesive tape on both sides of the break in the track so that the gap between them is no thinner than the track.

Broken thread. View inside the cabin

Then apply a thin layer of conductive glue at the break point, connecting the track, without waiting for the glue to dry, remove the adhesive tape from the rear window. Remember, if after applying the conductive adhesive the track still doesn't work, there is another break somewhere in that track.

In this simple and clear way you can restore the heated rear glass. Now, even in snow and rain, the rear window will be clean and transparent, providing the driver with excellent visibility.

Rear window heating of VAZ 2109 restored

If you live somewhere in the middle of nowhere and no one in your area has heard of conductive glue, then there are quite a few options for restoring rear window heating: starting from homemade adhesives with copper filings and graphite, and ending with fans for blowing the rear window. You can search the Internet and find what suits you.

Checking and replacing the heating relay

Typical VAZ glass heating relay

Problems that arise over time with heating the rear window are often associated with circuit problems, a blown fuse, as well as a heating relay:

In VAZ model cars, the rear window heating relay is used to turn on the heating for a certain time within fifteen minutes
This system operates thanks to a built-in timer.
For vehicles in which a relay was installed, such a system can be located in the standard relay block or in the fuse box
And in place of the standard relay, a new one is simply inserted and the heating is turned on with a standard button
It is very important here that the winding of this relay is constantly connected to ground.
The purpose of the relay is to turn off the heating when the motor is not running. The most important thing is that heating does not drain the battery

Relay replacement

If the glass heating does not work due to a broken relay, then the instructions dictate the following actions:

First you need to disconnect the battery from ground
Then remove the heating switch from the dashboard and disconnect its connector
Next, you should check the condition of the circuit between the ends (terminals) of the 1st and 3rd connectors located on the relay side
Be sure to check the status of the heater timer
The control (test) light of the switch lights up when turned on and goes out after 12 minutes
When the switch does not function, then it needs to be replaced
Then the condition of the circuit from the side going to the switch connector is checked
When the ignition key is in the off position, there will be no voltage
We connect pins 4 and 6
Then we check the operation of the heater
If something does not work, then you will have to replace the switch
The heating relay should be located in the fuse box, which is located in the passenger compartment
It turns on only when you turn the ignition key in the lock and continues to work when the engine is running
We turn on the heating by pressing the power button, after twenty minutes of operation the heating automatically turns off
This heating function is very convenient and even necessary.
You can install the relay in the rear window heating system yourself, or at a service station if you are satisfied with their price

Diagram of elements of the glass heating system

A detailed diagram of the heated rear window system of the VAZ 2110 is shown in the figure below, according to it:

The glass heating element is activated using an auxiliary relay designated K7 of type 904.3747-10, which is installed in the mounting block
When the heated rear window is turned on, control light 4, located next to the switch, immediately lights up, it illuminates the switch key in red or orange.
In VAZ 2110 cars, the heated rear window can only be turned on if the ignition is turned on, because the voltage to switch 3 goes through another relay designated K6, which is activated when the ignition is turned on.
The power supply to the glass heater is supplied from relay contacts K7 through fuse F7, connected directly to the power source
If you turn on the heating, but the rear window is not heated, then you need to check the condition of fuse F8, as well as the wires connecting them, and also relay K7 and switch

Fuse

If your rear window heating does not work, your VAZ-2110 should be checked for a blown fuse. In the mounting block, check the elements in connector F8 (usually they are rated at 20 amperes). If the fuse looks like the one in the photo below, it needs to be replaced. For the future, experienced car owners advise carrying a spare set in the glove compartment. After all, if the fuse for the fuel pump burns out (especially while on the road), then the car will not be able to start at all.

What is the reason for this phenomenon? Most often this happens due to a short circuit. At one point, the voltage on the on-board network increased above normal. To prevent the contacts from melting, the system is simply turned off by breaking the connecting elements. In this case, this is +12 V power and conductive elements on the rear window.

What causes interior glass to sweat?

Why do the windows on a VAZ 2110 fog up? This is a question that baffles half of car owners. I’ll say right away that this most likely happens in cold weather due to increased humidity in the car interior, from which I’ll now explain:

The most common reason is if the driver has a hangover, the windows sweat from fumes
The second most common reason is that the interior heating radiator is leaking quietly, the liquid collects under the rugs, while the leak is small, it is almost unnoticeable, so it is worth checking the condition of this radiator
Another reason for glass fogging may be the wrong direction of the stream of warm air from the stove; if the glass is blown, it dries, when it is not blown, it may begin to “sweat”, this, by the way, is the main reason why the windshield on a VAZ 2110 sweats

Checking and repairing the entire rear window heating system

It often happens that replacement or repair of the heated rear window is necessary due to faulty wiring diagrams. Therefore, for repair and replacement we perform the following operations:

Disconnect the battery terminals
When you have a stereo system connected to your car that has a security code, make sure you remember (know) the code to enter before disconnecting the terminals
We pry and remove the heated glass switch from its mounting socket on the dashboard, disconnect the electrical wiring
It is important to make sure that there is continuity between terminals 1 and 3 of the electrical wiring connector on the relay side
When there is no conductivity, then the lamp must be replaced
Using jumper wires, connect “plus” to terminal No. 2, “minus” to terminal No. 4 of the switch contact connector
Then, using a 3.4 Watt probe light bulb, connect the “plus” to terminal No. 6
We activate the heater, and the control lamp should shine for 12 - 18 minutes, then go out
If a faulty switch is detected, it must be replaced

Disconnect the wiring from the switch and check the connector from the harness:

The continuity between terminal number 4 and ground must be constant
When the ignition key in the lock is in the LOCK or ACC position, there should be no voltage at terminal number 2 and ground, as well as terminal number 6 and ground
And in the ON key position, voltage should appear between the described pairs of terminals
We bridge terminals 4 and 6 from the contact connector and make sure that the rear window heating element is working
If the switch was faulty, it needs to be replaced
To identify a relay malfunction, you need to make sure that there is constant continuity of terminals number 1 and number 2
We apply voltage to them, then make sure that terminal 3 and terminal 5 are open
Replace a faulty relay
If the points described above still did not help fix the heating, then it is necessary to replace the glass heating element itself

The check of all glass heating devices has been completed. Additionally, we suggest watching a training video.

Rear window heating diagram for VAZ 2110, 2111 and 2112

1 – mounting block;
2 – ignition switch; 3 – rear window heating switch; 4 – control lamp for turning on the heating; 5 – rear window heating element; K6 – additional relay; K7 – relay for turning on the heated rear window; A – to power supplies The rear window heating is activated using the auxiliary relay K7 (type 904.3747-10). When the heating is turned on, the orange lamp 4, which is located next to the button, lights up. The heated rear window only works when the ignition is on, since voltage is supplied to the button through an additional relay K6, which is activated when the ignition is turned on. Power is supplied to the heating threads through the contacts of relay K7 from fuse F7, which is directly connected to the power sources.

Heated rear window does not work

The rear window on passenger cars is often used for visibility, so it must be equipped with a special heating system. Its failure greatly interferes and affects safety - the glass quickly freezes in winter or fogs up in the rain. What kind of failures can be hidden in this system?

The reasons why the rear window heating does not work are almost always electrical. After all, this system has no moving parts, electric drives or other complex things. To understand what is included in the system, let's look at the diagram.

In the classic and simplest version, the glass heating works when the ignition is on. When the button is pressed, power is supplied to the relay control contacts

, it connects the power circuit and current is supplied to the heating filaments glued to the glass. The “mass” of threads is usually connected to the body in the area of the rear pillars.

Based on this, the most common reasons why the rear window heating does not work are:

Relay faulty

A faulty relay is the most common problem that occurs in the rear window heating system. There is a contact group inside it, which over time can burn out and stop passing current. Read how to test a conventional electromechanical relay here. To easily troubleshoot a fault, you will need a multimeter, but you can get by with a classic “control”.

Heating filaments are damaged

Another common malfunction is damage to the glass heating filaments. They are a thin layer of conductive substance applied to the glass and are quite easily damaged by mechanical action, for example, removing tinting.

It is extremely easy to determine such a malfunction - very rarely all the threads are damaged at once. As a rule, one or two lines fail, and the rest continue to work. To fully restore heating functionality, you do not need to replace the glass. There are special adhesives that can be used to repair damaged threads and restore the ability to heat them.

Wires are damaged

Perhaps the most difficult case is damaged wires in some part of the electrical circuit in the heating system. The main difficulty here is finding the break point. Testing the wires with the same multimeter will help you find this place, and you can fix the break using the twisting method or using terminals. For more details on how to connect wires, read the article on how to connect wires in a car.

Burnt fuse

And, of course, before you start looking for why the rear window heating does not work, you need to check the fuse. Which one is responsible for the operation of this system can be found out from the electrical diagram of your specific car. If the fuse is intact, then proceed to the points described above. If the fuse is blown, there is most likely a short circuit in the car. Install a suitable fuse and turn on the heated glass. If the new fuse immediately burns out, then you need to look for a place with a short circuit.

Here we describe the malfunctions that occur in the simplest rear window heating connection diagram. This circuit can be supplemented with additional devices, for example, a timer that automatically turns off the heating after a certain period of time. If your car has additional functions, then during the search process, be sure to make sure that the devices that implement them are in working order!

Troubleshooting procedure

We check fuses F8 (20A) and F8 (20A) (mounting block).
We check the serviceability of the rear window heating button. Is there a “plus” on pin No. 10 of the switch button and after turning on the button on pin No. 9 (a test lamp or multimeter will be useful).
We check +12V at the Ш5-2 output and at the connector near the rear window.
We check the wires and their connections.
We check the rear window heating relay - K7.
We check the integrity of the glass heating filaments.

The algorithm for determining the cause of a malfunction is similar for most cars, the only differences are in the names of fuses, relays and connectors.

By the way, did you know that to extend the service life of the heating elements, they use a Glass Heating Regulator (DOC), and you can also install a Fresnel lens on the rear window?

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Reasons why the heating does not work on the rear window of the VAZ 2110

Almost all VAZ 2110 cars have a rear window heating system. But even if this system is not provided for in some models, it is usually “finished”, since here we are talking about basic comfort today. If the rear window heating does not work on a VAZ 2110, this creates many problems.

As a rule, heating is especially needed in cloudy, cold weather in autumn and early spring, when the glass becomes covered with condensation, blocking the driver’s visibility of what is behind the car.

Rear window with heating filaments

This lack of vision is especially dangerous when parking. The same can be said about winter use, when the frost literally draws patterns that you don’t want to admire at all.

What to do if the rear window heating does not work (VAZ 2109, 2110, 2114)

Sometimes we find ourselves in a situation where the rear window heating does not work. What to do - more on that below. First, let's look at the causes of the malfunction.

The most common reasons may be as follows.

The fuse has blown. Option - there is no contact with it in the sockets. Actually, the check should begin with replacing the fuse, even if visually it looks intact.
The switch has failed.
The relay has “flyed”.
There is no contact at the heater terminals.
Break in the wiring.
Breakage of the heater filaments themselves.

Armed with a car tester, with certain skills, all these defects in the rear window heating can be detected.

Now specific answers to the question: the heated rear window does not work - what should the owner of the car do in such a situation (no matter what domestic model - VAZ 2109, 2110 or 2114)?

Regarding the first four points, if the tester “found” them, there should be no questions. A malfunction has been identified and needs to be fixed, which is understandable.

The more difficult case is when the threads of the device break. By the way, this defect can be determined visually. When the rear window of the car fogs up slightly, turn on the heating. Working threads cause slight evaporation. Those who are not working do not have this process. These are the threads that interest us. More accurately, the break point can be found using a magnifying glass.

What to do next ? There are two ways to go.

Replace the stationary heated rear window with a removable version (with suction cups) connected via the cigarette lighter. Or install a heater with a fan (not a very rational option, given the subsequent increased current consumption).
Restore the conductive threads if the rear window heating does not work. There are many ways to do this. So what to do in this situation? What methods of “treatment” are there?

“Patching” the breakage area with conductive paste. The place needs to be localized with two pieces of adhesive tape. Connect the ends of the conductor, stripped and washed with alcohol, with paste and let dry for a day.
Restoring the heated rear window using glue and a magnet. You will need homemade sawdust, which needs to be “planed” with a file. The magnet can be taken from any broken speaker, the glue is BF-2 or its equivalent. The magnet is placed on the reverse side at the breakage site, the sawdust is placed on the side of the thread. Next, coat the “joint” with varnish.
Electrolytic method. You will need sulfuric acid and copper sulfate. The method is quite labor-intensive; the point is to redirect copper ions from the copper electrode to the heating element.
Sometimes soldering is used if you use zinc chloride as a flux, and use low-tin solder (POSS-4-6, POS-18). This is the case if the break is point-like. If it is large-scale, it is better to “patch” it with silver or copper wire.

There are special adhesives for restoring heating filaments. They are not particularly popular yet.

In principle, these are the main methods and algorithms that need to be used if the rear window heating does not work. Now the question - what to do - will not confuse you.

A very similar method is using metal shavings and paint.
The algorithm of actions is the same. January 17, 2018Teor21

How the system works

The operating principle of heating is very simple; it is used today in almost all cars, including foreign cars. Something simpler and better has not yet been invented. A conductive thread is applied to the rear window on the interior side, which heats up; accordingly, the glass is heated, which eliminates fogging from the inside, as well as snow and ice located on the outside.

This system is made up on a VAZ 2110:

the thread itself, which provides heating;
wiring going to it;
heating relay;
switch with signal light inside;
fuse.

That is, nothing complicated for a craftsman. Considering that the size of the rear window of the VAZ 2110 is 121.3x67.6 cm, the heating size is usually only a couple of centimeters smaller, and essentially covers the entire surface, providing complete heating and good visibility of what is happening behind. There is no point in installing a much smaller heating system, because the driver should see the entire road behind, and not part of it.

Damage to the heating filament

For what other reasons does the rear window heating not work? VAZ-2110 is equipped with special threads. A break can happen here too. The threads are a small layer of conductive substance. It is easily damaged by the slightest mechanical impact (even with such harmless actions as removing tint). You can determine the location of the damage using a magnifying glass. It is advisable to carry out diagnostics during daylight hours. Damage to the threads is one of the obvious reasons why the rear window heating partially does not work on the VAZ-2110.

Causes of malfunctions and their identification

The heated rear window works as soon as the ignition is turned on, and the glass should clear within a couple of minutes. But sometimes it happens like this:

The power-on signal does not light up, although the button is pressed, the glass does not defrost (remains foggy);
The heating does not work, but the control light is on;
The glass thaws in stripes;
Heating is insufficient. This phenomenon occurs if the glass is heavily frozen. In this case, simply clear it of ice mechanically.

The root cause of other phenomena should be sought:

in relay control;
check the condition of the fuse in the box;
Check to see if the connectors on both sides of the rear window are secure. They may need to be cleaned;
also check for breaks in the supply wires in the switch itself;
if everything is in order here, you should check the conductive thread. With the engine running, you need to check the voltage approximately in the middle of each section (strip) of the thread. If the meter shows about 6 volts, everything is fine. If the readings are about ten, or, conversely, about zero, it means there is a break. A technique will help to determine exactly where the break is: the device has a pointed electrode, wrapped in a wide foil strip, and is led along a “suspicious” conductive strip. Where there is a voltage surge, there is a break;
but often you can literally see the break - the thread has come apart in some area.

Causes of faults and their detection

The heated rear window operates immediately as soon as the ignition is switched on, and should clear within a few minutes. But it happens like this:

The power signal does not light up, although the button is pressed, the glass does not melt (it remains blurry);
The heating does not work, but the indicator is on;
Defrosting glass into strips;
Insufficient heating. This phenomenon occurs if the glass is very cold. In this case, simply mechanically clear it of ice.

Rear window defroster timer

The root cause of other phenomena should be sought:

In the control relay;
Check the condition of the fuse in the box;
Check that the connectors on both sides of the rear window are secure. Perhaps they should be removed;
Also check for breaks in the power wires in the switch itself;
If everything looks good here, check the conductive thread. When the engine is running, it is necessary to check the voltage approximately in the middle of each of the thread sections (strips). If the device shows about 6 volts, everything is fine. If the reading is about ten or, conversely, close to zero, then a break occurs. The technique will help determine exactly where the break is: a pointed electrode of the device, wrapped in wide foil, leads along a “suspicious” conductive tape. Where there is a surge, there is a break;
But often the stones can be literally seen. the thread has spread in some area.

Reasons why the heating does not work on the rear window of the VAZ 2110

This lack of vision is especially dangerous when parking. The same can be said about winter use, when the frost literally draws patterns that you don’t want to admire at all.

How the system works

This system is made up on a VAZ 2110:

the thread itself, which provides heating;
wiring going to it;
heating relay;
switch with signal light inside;
fuse.

Causes of malfunctions and their identification

The heated rear window works as soon as the ignition is turned on, and the glass should clear within a couple of minutes. But sometimes it happens like this:

The power-on signal does not light up, although the button is pressed, the glass does not defrost (remains foggy);
The heating does not work, but the control light is on;
The glass thaws in stripes;
Heating is insufficient. This phenomenon occurs if the glass is heavily frozen.
In this case, simply clear it of ice mechanically.

Device

First, let's get acquainted with the structure of this system.

It includes the following elements:

The thread that provides heating.
Wiring (positive and negative).
System switch. Equipped with a warning light inside.
Heating relay.
Fuse.
Control buttons.

This system works very simply. There is a conductive thread on the rear window. It warms up when power is applied. This way the glass is heated and condensation is removed from the inside.

Why does the rear window heating not work on a VAZ-2110 car? The reasons may be trivial. After all, the device has no mechanical parts. Therefore, all you need for diagnostics is a multimeter and a test lamp. This is the only way to find out why the heated rear window of the VAZ-2110 does not work. There is a photo of the diagram in our article. Below we will look at the main elements to check.

The heated rear window does not work on the VAZ-2110 - what to do

All modern cars have a rear window heating system, which helps improve control of the road situation through the rearview mirror.
This option can be very useful in difficult weather conditions, since when the driver’s windows fog up or frostbite, the area over which he can observe through optical devices is reduced, and this can lead to emergency situations and serious tragedies on the road. It is worth noting that, depending on the configuration and year of manufacture, not every car of this model is factory equipped with a heated rear window. Therefore, many car owners add such a useful feature to their car for additional money. In this article, we will look at how to independently diagnose and repair a broken glass “warmer” and make sure that your car always has this unit working.

Heated rear window of VAZ 2110 does not work

Greetings to all owners of Lada family cars! Just a few days ago I noticed that the rear window heating does not work on my VAZ 2110, which I have been driving for more than eight years. I immediately decided to check the fuse - it was working. There are doubts about the relay: clicks are heard, but is there voltage? I don't know how to measure it. If everything is fine with the relay, then what should I do? What to check? Thank you in advance

Check the relay and button

ring the glass, buy a repair kit for gluing the tracks. I would like to change the glass right now because of the heating

Check the contacts behind the casing. Look at the ground and the block on the left rear building

My button stopped working, I replaced it and everything became fine, but I also searched for a long time

The chip look where the rear left glass is, I burned out there

The terminal may have come loose from the glass.

If a path is burnt out, it can be fixed - there is a remedy, such as glue. Sold in auto stores called DoneDeal DD6590 - costs 600 rubles.

It is unlikely that the entire glass will break at once. It’s more likely that the wire broke off in the rubber band that goes to the door. This is if you have a station wagon. If it’s a sedan, the button or terminals on the glass may have oxidized. Also look carefully at the tracks on the glass. If there is a burnout, you will see it. But they shouldn't all burn out at once. Usually some work. Look at the fuse, the button, maybe there is no plus.

To understand your problem and solve it, you need to understand how the heating system in a car works and on what principle it functions. On the interior side, a special thread conducting electric current is applied to the rear window. It slowly but effectively heats the glass, thereby preventing it from fogging and the formation of plaque on the outside.

Heating system design

The principle of operation of heating the rear window of a car is the same for all cars, since it is simple and practically does not differ on different models, both domestic and foreign. A thin metal conductive thread is applied to the inner surface of the glass, which, when heated, allows snow and ice to be removed from the outside. And from the inside it prevents fogging, improving the driver’s visibility.

On this family of VAZ-2110 vehicles, the heating system may differ only in size (number of threads) depending on the dimensions and configuration of the rear window. It consists of the following components:

a conductor that provides heating for the system;
relay controlling heating;
wiring for system operation;
switch with signal lamp;
fuse.

Taking into account the dimensions of the glass surface (for the VAZ-2110 they are 121.3 by 67.6 cm), the heating conductors have a laying area of 2-3 cm less on each side of its surface.

This is enough to fully warm up and ensure good visibility of the road situation behind the car through the mirrors. Car service specialists warn motorists against installing smaller systems, since the difference in price will be insignificant, but viewing the road will be significantly reduced.

Troubleshooting and Troubleshooting

Common manifestations of heating malfunctions, which should start working simultaneously with the ignition being turned on, may include the following symptoms:

If there is a light signal for the system operation, the glass is not heated.
The same thing happens when the button is pressed, but without a light signal.
Not all glass thaws (this usually shows up as strips of thawed and frozen water).
The surface does not thaw completely - due to severe freezing or attempts to mechanically remove ice.

The search for the causes of the malfunction should begin by replacing the corresponding fuse, which is responsible for the operation of this device in the VAZ-2110. In our case, this is a fuse marked F8 in the corresponding block, which protects the heated rear window. This block is located to the left and slightly lower from the steering wheel. For correct diagnosis, the fuse, even if it looks intact, needs to be replaced with a new one and the heating operation checked.

If the previous manipulation did not bring results, you need to check the car wiring from the rear window heating button. Burnt wires or breaks along their route will clearly indicate the cause of the malfunction. It is worth noting that a completely non-functional system is quite rare - much more often only some part of it fails. In this case, all heater filaments are usually checked for breaks, since it is obvious that they do not heat up due to the fact that current has stopped passing through them.

The most common cause of this phenomenon is mechanical damage to the conductors. Despite a fully functional system that will help melt the ice on the rear window of a car in a short time, many impatient drivers are in a hurry to free this surface from the “ice captivity” outside or from fogging from the inside using various improvised means, while harming the performance of the profile device due to vibration or physical contact.

If the system does not work correctly, the car owner checks which heating threads have stopped working. To do this, you just need to turn on the device and visually observe in which areas the glass does not heat up. Next, those places where the system does not work are carefully cleaned and inspected with a magnifying glass - this is how the place where the conductor breaks is located. In this case, it makes sense to check all conductive threads. Firstly, a break even on one strip can occur more than once, and secondly, you can accidentally discover places of future breaks, which can be expressed in the form of burrs, sagging, tears and scratches.

After identifying all emergency and unreliable places, it is necessary to treat them with a special paste (lubricant, spray), which, when dried, forms a conductive substance and completely restores the functionality of the rear window heating system.