Connection diagram for heated rear window VAZ 2110 injector 8 valves

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.

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.

VAZ 2110 diagram

1. block headlight; 2. front brake pad wear sensors; 3. fan motor activation sensor; 4. electric motor of the engine cooling system fan; 5. sound signal; 6. generator VAZ-2110; 7. oil level sensor; 8. carburetor solenoid valve control unit; 9. heater controller; 10. recirculation valve switch; 11. illumination lamp for heater control levers; 12. switch; 13. carburetor limit switch; 14. oil pressure warning lamp sensor; 15. spark plugs; 16. carburetor solenoid valve; 17. coolant temperature indicator sensor; 18. ignition distributor sensor; 19. ignition coil; 20. starter; 21. heater fan electric motor; 22. additional resistor for the heater electric motor; 23. speed sensor; 24. reverse light switch; 25. micromotor gearbox for heater damper drive; 26. recirculation valve; 27. brake fluid level sensor; 28. blocks for connecting the rear window washer motor; 29. battery; 30. windshield washer motor; 31. washer fluid level sensor; 32. coolant level sensor; 33. windshield wiper gearmotor; 34. mounting block: 35. blocks for connecting the warning light harness; 36. outdoor lighting switch; 37. instrument cluster; 38. rear fog light switch; 39. fog light indicator lamp; 40. indicator lamp for heated rear window; 41. VAZ-2110 watch; 42. rear window heating switch; 43. steering column switch; 44. block for switching wires when installing headlights of a different type; 45. instrument lighting regulator; 46. ignition switch; 47. connectors for connecting the headlight cleaner wiring harness; 48. socket for a portable lamp; 49. lamp for individual interior lighting; 50. brake light switch; 51. interior lamp; 52. on-board control system unit; 53. fuel level indicator sensor; 54. hazard warning switch; 55. driver's seat belt sensor; 56. cigarette lighter; 57. ashtray illumination lamp; 58. glove compartment lamp switch; 59. block for connecting the on-board computer; 60. glove box lighting lamp; 61. side direction indicators; 62. switches in the front door pillars; 63. switches in the rear door pillars; 64. parking brake warning lamp switch; 65. trunk lighting; 66. temperature sensor for the heating system; 67. external rear lights; 68. internal rear lights; 69. license plate lights; 70. rear window heating element; 71. block for connecting an additional brake light.

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?

Fuses and relays VAZ 2110

F1 - 5A - License plate lamps. Instrument lighting lamps. Side light indicator lamp. Trunk light. Left side side light lamps F2 - 7.5A - Left headlight (low beam) F3 - 10A - Left headlight (high beam) F4 - 10A - Right fog lamp F5 - 30A - Door window electric motors F6 - 15A - Portable lamp F7 - 20A — Electric motor of the engine cooling system fan. Sound signal F8 - 20A - Rear window heating element. Relay (contacts) for turning on the heated rear window F9 - 20A - Recirculation valve. Windshield and headlight cleaners and washers. Relay (winding) for turning on the heated rear window F10 - 20A - Reserve F11 - 5A - Side light bulbs on the right side F12 - 7.5A - Right headlight (low beam) F13 - 10A - Right headlight (high beam). Indicator lamp for turning on the high beam. F14 - 10A - Left fog lamp F15 - 20A - Electric seat heating. Trunk lock lock F16 - 10A - Relay-breaker for direction indicators and hazard warning lights (in emergency mode). Hazard warning lamp F17 - 7.5A - Interior lighting lamp. Individual backlight lamp. Ignition switch illumination lamp. Brake light bulbs. Clock (or trip computer) F18 - 25A - Glove box lighting lamp. Heater controller. Cigarette lighter F19 - 10A - Door locking. Relay for monitoring the health of brake light lamps and side lights. Direction indicators with warning lamps. Reversing lamps. Generator excitation winding. On-board control system display unit. Instrument cluster. Clock (or trip computer) F20 - 7.5A - Rear fog lamps

K1 – relay for monitoring the health of light bulbs; K2 – front wiper relay; K3 – repeater and alarm relay; K4 – low beam relay; K5 – high beam relay; K6 – additional relay; K7 – relay for turning on the heated rear window; K8 – backup relay

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I was faced with the heated rear window of my car not working, the problem was...

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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.

Repair work

The filament can literally be “painted” using conductive varnish or a special repair kit.

If this does not help, you may need to install a new relay.

It is located either in the standard relay box or in the passenger compartment fuse box. Installation is simple: take out the old one, put in the new one. But before this procedure, you must disconnect the battery!

The collection contains all the necessary documentation for the electrical equipment of the VAZ-2110, the circuit itself, the seat heating system, headlight cleaner, electronic engine control module and fuse box. Diagrams for other models can be viewed here. Below is a high-quality color diagram of the electrical equipment of the domestic VAZ-2110 passenger car.

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.

Rear window heating operation diagram

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.

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.

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.

Rear window defogger time relay

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.

Heating system design, typical malfunctions

The glass heater in the car is quite simple. Typically, threads are applied to the glass surface, which can heat up when current passes. Other components that ensure startup, proper operation and power supply of the circuit are a button, wiring, relay, fuse, battery.

Frequent problems:

The heating is ineffective and streaks of fog appear. The defect indicates damage to the threads. To identify the problem, you need to inspect the stripes; the place of damage is easy to detect - it will be foggy.
Heating and sweating occur very slowly, which means poor contact and possible problems with voltage. It is necessary to check the indicators at the input and storage.
If the heating does not work at all, but the light on the button lights up, the fuse may have failed or the problem lies in the power connectors.
If the system does not work and the control light does not light up, you need to pay attention to the heating relay. The button, voltage and ground are checked.
With a working system, defrosting does not occur. This happens when winter comes and the ambient temperature drops significantly, the glass freezes up. The heater power is not enough to thaw the ice. It is recommended to clean the glass by hand so that the threads can work normally.

Complete failure of the heating system is rare. The integrity of the threads is often compromised. If problems occur with the device, you can carry out repairs yourself.

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.

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.

The heated rear window of the VAZ 2110 does not work, what is the reason?

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.

How the system works

Rear window heating operation diagram

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.

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

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

Complete heating connection diagram

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

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.

Why do the heating, heater and wipers fail at the same time?

Separately, situations stand out when the stove, wipers, and heated rear window do not work. Sometimes, along with these systems, the washer also stops working.

A one-time failure of these devices causes a lot of problems; problems can occur periodically, but they affect the safety of the car. The peculiarity of this breakdown is that the operation of all components is tied to one fuse.

Ways to eliminate the defect:

To quickly solve the problem, just replace the fuse;
When examining a faulty unit, it is easy to notice burnt tracks, which can also be soldered.

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.

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.

How to repair the conductive layer? Method No. 1

You can do this yourself. To do this, you do not need to dismantle the glass. All you need is to purchase a special conductive paste (available in auto stores or on the market) and apply it to the damaged area. It is important to prepare it carefully. To do this, carefully clean the varnish from the surface and degrease the area with alcohol (use a piece of soft rag). Next, we clean the ends of the damaged threads. We apply adhesive tape or electrical tape to its upper and lower parts so that there is a small gap (no wider than the thread itself). We apply a special adhesive into it. After a day, the composition will completely dry out. Next, you can remove the remaining tape and check the system for functionality. If the heating works only partially, it means that the break occurred in several places. Find the second place where the thread is damaged and treat it with a conductive compound using a similar principle. That's all. We will also consider the old-fashioned method of repairing threads.

Method number 2

This method involves the use of non-ferrous metal shavings as a conductive element. Also, to repair the thread, we will need a transparent varnish (it is advisable to use a thick one, like for nails).

Mix the shavings with a brush and apply to a strip previously sealed with tape, as in the previous case. After an hour, the varnish will completely dry. The method is quite old. It is not always possible to connect damaged contacts as needed. Therefore, if it is possible to buy conductive glue, it is better to use the first method. It will be much faster, easier and more reliable. The cost of a 10-gram tube with this composition is 78 rubles. This volume is more than enough to repair several damaged heating threads.

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