Mounting fuse block VAZ 2109 - 21099 with carburetor engines

On the entire family of carburetor cars "Samara 1" and on some carburetor cars of the family "Samara 2" (VAZ 2113 - 2115), two types of fuse blocks are installed, old and new. These devices are also called mounting blocks. They are the heart of the car's electrical system, because they are equipped with executive relays for low-current circuits. Using the mounting block, relays of high-current and additional circuits are also controlled - starter, fog lights, heated seats and others. The installation location of both units is the same, the difference is in small differences in the electrical circuit, different connectors and different arrangement of elements and a different housing design.

How to replace VAZ-2109 fuses

If any of the electrical devices on the car does not work, first check the fuse in the circuit of this device.
Depending on the year of manufacture, one of two blocks may be installed on the car. Units of different years of manufacture have different types of fuses. Always carry a set of spare fuses with you. Do not replace fuses with jumpers or fuses rated for a different amperage. This will lead to failure of the vehicle's electrical devices.

1. Most electrical circuits are protected by fuses. The fuse box is located in the rear of the engine compartment on the driver's side. On the inside of the block cover there are fuse numbers and current in amperes.

2. New fuse box. The numbers of fuses, the devices of the circuits they protect, as well as the current strength are given in the table.

Each block has only its own fuses.

The amount of current in amperes for which the fuses are designed is indicated on the fuse body.

3. Early release fuse block.

4. The numbers of fuses from early years of production, the devices of the circuits they protect, as well as the current strength are given in the table.

5. Press the latches on both sides of the cover and remove it.

6. To remove fuses from the block, use tweezers that are attached to the block.

7. Grasp the fuse with tweezers and remove it.

8. Broken fuse. The fuse has blown.

9. Spare fuses are installed at the front of the unit.

10. To install the fuse, insert it into the socket connector and press until it locks.

11. On the left side under the instrument panel, an additional 8 A fuse is installed on the wires, protecting the rear fog lamp circuit.

The generator, ignition, engine start circuits (battery, starter, etc.), headlight relay and central door locking relay are not protected by fuses.

service features with photos and video recommendations The auto electrician himself

Owners of Samaras from the first years of production often complain about burnt contacts and faulty electronics. The reason for this is most often low-quality components, which the VAZ 21093 electrical wiring abounds in sufficient quantities. And when the first symptoms appear, you should immediately begin repairing faulty components, since the safety of road users depends on this.

Wiring should be looked after from the very first days

Mounting block

Of particular concern is the mounting block, which is located in the “wet” area under the hood - the drainage hole often becomes clogged, and moist air gets inside, oxidizing the contacts. The VAZ 21099 also has similar design flaws.

Due to the design feature, the mounting block is exposed to dirt and moisture

Symptoms

Original wiring diagram for VAZ 21093 carburetor

The car signals to the owner that not everything is in order with the contacts in the most unusual way:

1. When the fan is turned on, the engine begins to stall;
2. The power unit behaves similarly when the high beam headlights are turned on;
3. When you turn on the starter, a smell of burnt plastic appears in the cabin;
4. Similarly, when turning on a heating stove, etc. while moving.

Such “finds” are not uncommon at Samara.

If one of these symptoms appears to you, you need to immediately correct the situation with your own hands before it gets out of control.

Note! The fact is that the wiring of the VAZ 21093 to the injector is characterized by quite high loads, and any unstable connection in the circuit can turn into disaster, the price of which is the cost of the car and your health

Remedies

The original wiring diagram of the VAZ 21093i is designed in such a way that the main load falls on the next circuit (pictured below). The wiring of Moskvich 2141 is arranged in a similar way.

Main components requiring monitoring of installed wiring

The diagram shows:

1. battery;
2. generator type 37.3701;
3. mounting block;
4. mechanical ignition switch.

It is best to start your search with the mounting block. Remove the terminal from the battery, open the cover and inspect each contact.

The burnt contact should be sanded and degreased. And replace the block with a new one

Fuse box

Another problematic unit of the Samara is the old-style fuse box. You can learn how to upgrade it yourself from the video below.

Lighting and sound devices

1. Instead of activating brake lights in the rear lights, when you press the brake pedal, real “color music” begins;
2. The sound signal is unstable;
3. The radio or radio is also unstable.

Damaged parts must be replaced

Note! Here the instructions will be similar - immediately find the burnt contact (in the photo) and repair it. And if impossible, replace with new parts

You can read about how to fix a similar problem with contacts on a GAZelle in our other article.

Finally

In fact, the wiring of a VAZ 21093 to a carburetor or injector is quite reliable, which cannot be said about the connectors and terminals

It is their condition that should be given the closest attention.

And if you detect the symptoms described in the article, you should take immediate troubleshooting measures. The safety of your car depends on this. Good luck on the roads!

How to remove and install the VAZ fuse mounting block

The basic procedures for removing the mounting block of any model are the same. To remove the mounting block, do the following:

• Remove the negative battery terminal.
• Unscrew the two nuts on the sides of the block (it is located on the driver's side of the engine compartment above the vacuum brake booster).
• Lift the unit as far as possible and pull out all the connectors from the bottom.
• Install in reverse order. First insert all the connectors, then tighten the nuts.

How to disassemble and reassemble

Before disassembling the mounting block, print out a photo or diagram of the fuses and relays, and mark or write down where each relay is installed, because the parts description on the inside of the cover is not always helpful.

• Remove the cover. To do this, on the old model of the block, unfasten one latch from each side; on the new model, unfasten two latch from each block.
• Remove all relays and fuses. The new model has special tweezers that help pull out fuses; it is located next to the turn signal relay.
• After this, unscrew the screws that connect both halves of the body.

On most older model blocks, the screws are installed on top. Most new ones have bottom. But it also happens the other way around, because blocks are produced not only by AVTOVAZ. Use a thin flathead screwdriver to separate both halves of the housing. If you cannot disconnect, make sure that you have unscrewed all the screws and try inserting the screwdriver in a different place. Opening the case, remove the printed circuit board with the connectors installed on it. Reassemble in reverse order. First, install the circuit board onto the mountings of one half of the case, then slide the other half on and gently press them together until they are connected. If you cannot connect the case halves, disassemble them and make sure that the printed circuit board is in place, then reassemble. Then secure the body halves with self-tapping screws.

How to check heating?

To do this, you need to wrap the voltmeter probe in aluminum foil and press the foil with your finger and move it along the conductive threads. This way you can detect where the threads are broken.

Initially the voltmeter will show a voltage of 6V. If it displays 12 V, then in this place there is a break in the thread on the side between the connection point of the voltmeter and the heater side. If the voltage is below 0 V, then the conductive strip has a break on the side between the connection point of the volt meter and the heater side.

It is recommended to use an ohmmeter to measure the resistance of the conductive strip between the side terminal of the heater and the center of the strip. The section of the strip with the gap will have twice the resistance of the remaining strips.

You can repair a conductive strip using a conductive mass: glue mixed with metal shavings, a special material. You will also need electrical tape, solvent, and a brush. Use a solvent to clean the area of ​​the glass where the conductive strip of the heater breaks. Electrical tape will be needed as a stencil. Apply conductive compound and remove adhesive tape. After a day, you can remove the excess.

Malfunctions and block diagrams

Despite some differences, the malfunctions of all models of such units are the same:

• oxidation of contacts;
• short circuit due to dirt.

Getting inside the mounting block housing, water mixes with dust and forms dirt, which over time spreads along the bottom or top of the circuit board. Malfunctions of the mounting block are often very similar to breakdowns of other electrical systems of the car, so the exact cause can only be determined after dismantling and opening the block.

It is necessary to remove and check the mounting block if the following malfunctions are observed:

• unstable operation of headlights or random on/off/mode switching;
• problems with the radio;
• periodically missing ignition;
• unclear operation of the wipers or washers;
• unclear operation of the sound signal;
• Incorrect or unclear operation of the direction indicators.

Differences between VAZ fuse mounting blocks

The catalog number of the mounting block of the old model is 17.3722. The main difference from the more modern unit with catalog number 2114-3722010-60 is poorer protection from moisture, which is why the life of the device is several times lower.

After all, the mounting block is located in a niche in the engine compartment, where rainwater or washer fluid often gets in. The new mounting block does not have relays for turning on the fan and rear window washer. This is caused by changing the vehicle's electrical circuit and installing these relays in different locations.

Another difference is that the new model of the mounting block uses a different type of fuses, which are more resistant to moisture. To distinguish one block from another, you need to read the inscription on the cover; the model number is indicated there. If for some reason you cannot read the text on the cover, remove it and compare the blocks with the photographs from this article.

Source

Tips for motorists

The VAZ-2109 car is equipped with two windshield washers. One works on the front windshield, and the second on the rear windshield. Failure to operate the washers can occur both due to faulty electrical equipment and due to the failure of the nozzles or the polyethylene tubes supplying liquid to them.

If the washer fails, the first thing we do is check whether there is liquid in the nutrient reservoir. If it is there, then we look to see if there are any leaks of liquid due to leaky supply pipes. If everything is in order with the tubes, then we turn on the washer pump and listen to whether it works. When the pump is running, you need to look for the reason for the failure of liquid to flow to the windshield either in the solenoid valves, or the injectors are clogged, but the likelihood that both injectors are clogged at once is quite small and therefore the solenoid valves will most likely be to blame.

But if when you turn on the pump it does not work, then you will first have to open the mounting block and check whether fuse F7 (30 A) is intact. Moreover, it is necessary to check not only the integrity of the fuse itself, but also the condition of its contacts, for their oxidation. If everything is in order with the fuse, then we check the pump itself by connecting it directly to the battery.

Mounting blocks were installed on VAZ 2109 cars: 17.3722 and 2114-3722010-60. The difference between them is that the new unit uses fuses of a different type. But the most important thing is that on block 17.3722 a time relay was installed, but on block 2114-3722010-60 this relay is not present. Therefore, when troubleshooting the rear washer, on those VAZ-2109 cars where block 17.3722 is installed, it was necessary to check this relay as well.

Drivers of “nines” are quite capable of independently finding and eliminating malfunctions that lead to failure of the washers.

Every car has a block that contains fuses for various devices. To prevent all this from being randomly located throughout the car body, a plastic block with a lid was specially created, in which fuses were installed neatly and with markings.

Fuse box diagram for VAZ 21099

First of all, it is worth noting that in the VAZ 21099 of the new type, which were produced since 1998, new variations of power supplies with U-shaped fuses were installed.

The diagram of the mounting block (IMAGE 1), which is located under the hood, is located on the cover on the inside. This is a schematic diagram with marks where each of the fuses is located and which circuit it is responsible for. Also, the diagram of the VAZ 2109 mounting block is additionally printed in the vehicle operating instructions. Using it, you can find the location of any electrical circuit in a matter of seconds, which provides the necessary information for diagnosing the electrical circuit contact. But at the same time, some of them connect several chains. For example, F4 is not only a cigarette lighter fuse, but also a relay that is responsible for the heated rear window (if provided) and the connector for a portable lighting lamp.

If we look at the fuse box of the VAZ 21099 injector (without a carburetor), then the connection diagram is identical. The only exception is that some of the circuits will not be closed, but this is normal. As always, you can compare it with the conditional diagram that is duplicated on the cover of the mounting block.

Video

Watch a video from the Mechanics channel about removing the VAZ 2109 fuse box

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New fuse box

In the table we give the designation of fuses, what they protect and what current they are designed for:

The table shows the pinout of the fuse box of the new model 2109:

Marking 17.3722

Let's take a look at the electrical circuit of the old-style power supply unit, as well as the purpose of the fuses. As we said at the beginning of the article, a power supply with such a circuit can be found in a VAZ 2109, both equipped with an injection and a carburetor engine.

Old-style power supply circuit Old-style VAZ 2109 block

If you are the owner and your heater fuse or fuel pump fuse has failed, for example, then it would be useful for you to know the purpose of the unit’s parts.

Purpose of old-type power supply components

In addition, information about the purpose of the relay will be useful to you. It is presented below.

Marking 2114-3722010-60

Now let's look at the electrical circuit and the purpose of the parts of the new block. As stated above, this scheme will be relevant for both injection and carburetor internal combustion engines.

Electrical diagram of a new type of power supply on the VAZ 2109 since 1998.

Below is a table explaining each part of the device.

Description of the purpose of the new type of power supply components

We will also consider the purpose of the relay.

Removal and replacement process

In practice, VAZ 2109 owners often encounter problems when the fuse for the cigarette lighter fails, the lamps on the instrument panel, the heater or the fuel pump do not work.

If the PP is to blame for the non-working condition of the electrical equipment, then you should replace it. In principle, the change process is no different.

The difference lies only in the power supply circuit and the different housing of the power supply itself.

For carburetor and injection engines

1. First of all, you need to open the hood and disconnect the negative terminal from the battery. Remember that all repair work related to the power supply must be performed with the battery turned off.
2. Find the power supply under the windshield near the driver's seat. It is protected by a plastic cover. Press the latches on its sides to remove the cover.
3. Remove the cover and on the back you can see a wiring diagram that shows the location and purpose of each component.
   If you need to replace a part responsible for the operation of the stove, cigarette lighter, gas pump or other equipment, then find it in the diagram or use our manual. After this, remove the PP by hand or using special tongs. If you are replacing a relay, remove it by rocking it up and down.
4. Replace the burnt part with a new one of the appropriate rating. A burnt-out PP can be identified by a broken fusible thread. Carry out the entire installation in reverse order. Connect the negative terminal of the battery.

On the left side relative to the movement of the car, under the windshield you will find a black block in which all the PCBs and relays are installed. Remove the cover by pressing the latches on the side. Using pliers (BP marking 2114-3722010-60), remove the burnt part from the seat. In the case of the old marking block 17.3722, remove the burnt-out element by hand. The red arrow in the photo shows where the number is printed on the PCB body. When replacing, the nominal value must be observed. Install a new element in place of the burnt-out PP, observing the nominal value. Don't forget to close the power supply cover and connect the battery.

Video from Sergei Zukol “Reworking the VAZ 2109 power supply”

This video shows the process of converting a power supply from an old model to a new one.

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Source: https://avtozam.com/vaz/2109/raspolozhenie-predohranitelej/

How to remove and replace the block

Such an operation may be necessary if it is necessary to repair the power supply or replace it with a new unit. Even a novice driver can do this. You will need a 10mm wrench (it is best to use a socket or socket). Before removing the power supply, open the hood of the car's engine compartment.

Procedure for removing the power supply:

1. Disconnect the terminals from the battery. This is necessary to prevent the possibility of a short circuit in electrical equipment.
2. For ease of operation, remove the protective plastic top cover of the power supply unit.
3. The block is secured to the body with two screws (they are removed with a wrench).
4. Disconnect the connectors with wires. One of them is located in the engine compartment on the wide side of the block closer to the windshield. First, remove the rubber protective cover, and then, rocking it from side to side, disconnect the connector.
5. The remaining connectors are located at the bottom of the power supply. To get to them, remove the two outer relays, painted black. After this, the power supply housing is lifted up and the remaining connectors are disconnected.

The unit is removed from the engine compartment for repair or replacement. Reinstalling it in place is carried out in the reverse order.

In this case, pay attention to the rubber gasket between the power supply and the car body. It must be intact, without cracks or tears, otherwise it must be replaced with a new one.

The gasket is needed to protect the power supply from moisture, which can cause a short circuit in the car's electrical circuit.

Watch the video of the AvtoMalina channel about removing the VAZ 2109 fuse box

Location in the car

There are two types of location of turn signals in the classic VAZ family of cars, depending on the modification:

Let's start disassembling

1. Early modification models

To get to the relay, you need to remove the plug by unscrewing the bolt on the dashboard.

We pull the entire panel towards us, move the sensor panel a little to the side so that we can get to the relay.

• The contacts approach the relay from below.
• Disconnect the contacts.
• We remove the old device and install the new one.
• We put the dashboard back, sliding it into the side grooves.
• Screw in the bolt.

We check the turn signals for flickering and characteristic clicks. The frequency of contact closure should be approximately 1 time per second.

The technology is very simple. The main difficulty here is accessibility to the relay. The space under the panel of these models is small, getting there is problematic.

1. Later models

• Remove the screws from the steering column switch housing. We remove the casing elements.
• Unscrew the mounting bolt.
• We take out the devices on the electrical wiring inside the cabin.
• We replace the old relay with a new one.
• Screw it back. We put the covers in place.

When replacing any of the above relays, special attention should be paid to contact insulation. Insulation is carried out using hollow mass braid

To tie the wires, use a special strip clamp.

Why does not it work

The main reasons why the cigarette lighter on a VAZ-2109 stops working are:

1. The fuse has broken. The maximum voltage that the connector can withstand is 20 A. But if you connect devices with high power to it, the fuse will stop functioning. In this case, the radio or the option responsible for heating the rear glass may stop working. To correct the situation, you will need to remove the front panel, find the burnt element and replace it with a new one.
2. The wiring has broken. Long years of operation or illiterate interactions with the car's electrical circuit can cause short circuits, burnouts and wire breaks, which in turn causes problems with the cigarette lighter. To identify the problem, you need to take a multitester and ring the cables suitable for the device. If there is no power, then a break has formed, which can be corrected by replacing the wire.
3. Burnout of the thermal coil located inside the device. Most often, the problem occurs due to prolonged use of the element. The breakdown cannot be repaired; the problem can be solved by replacing the device.
4. Oxidation of contacts, which occurs due to the use of a more powerful fuse. It could also be a temporary defect. You can fix the problem by cleaning the contacts. Before carrying out the procedure, it is recommended to disconnect the terminal that is responsible for the negative (black wire) from the battery to avoid a short circuit.
5. The backlight bulb has burned out. To fix the damage, you need to install a new light element.

Old sample

First of all, special attention should be paid to the electrical circuit. Below is an image of the old style fuse box diagram

The electrical circuit and pinout are responsible for the performance of many systems, ensuring their uninterrupted operation if necessary. For example, signals can be sent to window regulators.

It is also worth taking a closer look at the functions that the relay performs. They are summarized in a table.

Also, with the help of a relay, it is possible to organize the operation of the cooling system and stove during the cold season. This also ensures that the seats are heated. In addition, this is not a complete list of possible power supply functions that any VAZ 2108 car owner can or could use. For example, electric current can send brake lights.

Old style block

We present in the table the relay numbers and their functions:

Layout diagram, pinout

Designations and markings of the relay mounting block

The price of a new type power supply starts from 2000 rubles, individual melting elements from 100 rubles, a set from 350 – 450 rubles, depending on the manufacturer.

In Euroblocks, the fuse current was increased by 0.5 Amperes. Instead of the old 7.5 Amperes, 8.0 Amperes are installed. Remember this when choosing and purchasing consumables for repairs or replacement with a VAZ 2109 (8, 16 valves).

Signs of faulty fuses

• The module has changed color, black dots and carbon deposits are visible on the surface;
• An indicator on the instrument panel indicates a malfunction in the engine compartment;
• When the engine is running, the ignition is on, and the battery is charged, some mechanisms do not work or do not work correctly;
• In the interior of the car you can hear the smell of burning, melted in the area where the mounting block is located;
• The modules feel hot to the touch.

What do you need to know about power supply maintenance and repair?

In terms of maintenance, the blocks are unpretentious. The car owner is recommended to periodically check the working condition of the safety elements. To do this, you need to open the cover of the unit, located in a special compartment behind the partition separating the car interior from the space under the hood. If burnt out components are found, these parts must be replaced. If you don’t have a whole device for this, then you need to purchase it. It is not allowed to install a piece of wire instead of a fuse. This may result in a short circuit and damage to wiring and equipment.

The device is located in a place where moisture can collect during rain. Water flowing down the windshield of the car enters the compartment in which the unit is installed. This compartment has a special drain hole for water, but its presence does not always help to avoid exposure to moisture on the power supply.

The VAZ 2109 channel published a video in which the assembly procedure of the safety block was demonstrated in detail.

How to remove, disassemble and repair a power supply if it fails as a result of exposure to moisture:

1. Open the cover of the product, having first turned off the ignition and reset the battery terminal of the car.
2. Remove one by one all the parts and relays mounted in the block. Remember their location or take a photo of the power supply so that you don’t confuse anything during installation. Please note that 5 A fuses cannot be replaced with 15 A devices.
3. Unscrew the bolts that secure the block to the car body. The mechanism can be additionally fixed using sealant. In this case, it is necessary to remove its remains with a stationery knife.
4. After unscrewing the bolts, pull the block out of the seat. To do this, you need to disconnect all the plugs with wires connected to it.
5. When you have the block in your hands, visually assess the condition of its board. Prolonged exposure to moisture can cause mold to form on the circuit. You should try to clean the unit board with a dry cloth or a special product that can be purchased at the store. Contacts damaged by moisture must be resoldered. To do this you will need a soldering iron with rosin and tin. After the contacts are re-soldered, the block is mounted in place. Also evaluate the condition of the plugs on the cables connecting to the device. If the contacts are damaged by moisture, they will need to be replaced.
6. After installing the device in the mounting location, place all the parts, connect the battery and check the operation of the repaired product.

User Ivan Saichenko in his video showed how to solve the problem if all instruments and equipment in a VAZ 21099 car completely failed.

Dismantling and replacement

If one or another equipment fails, you must first check the condition of the fuse responsible for it.

In practice, removing and removing an unusable fuse or relay is not difficult. To do this you need:

• Raise the hood and disconnect the minus from the battery. Since you are working with the fuse box responsible for electrical equipment, the car should not be energized at this moment;
• Find the mounting block. It is located in the engine compartment opposite the driver's seat directly under the windshield. The top of the block is covered with a plastic cover. To remove it, simply press the latches on the sides;
• Remove the cover and look at the back side. There is an electrical diagram showing the location of one or another fuse or relay. Just find the element that is responsible for the failed equipment according to the tables above;
• Remove the fuse. All mounting blocks are equipped with special pliers. Manually removing fuses is not recommended. The relays are removed by gently rocking up and down;
• Replace the failed component.

Fuse failure is determined by the melted filament. These are fusible elements that melt and make contacts, preventing equipment from being damaged by excessive voltage.

That's it, all that remains is to replace the fuse block element, close the cover, replace the battery terminal and check the functionality of the equipment.

How to replace fuses on a VAZ 2108-VAZ 21099?

Note! It is easy to replace, but let us immediately inform you that on cars of the Samara family two mounting blocks are used, the first is an old model used on carburetors, and the second is a new model from a VAZ 2114 car, it is already installed on injection cars and is a new model and is marked 2114-3722010-60!

1. At the beginning of the operation, remove the cover from the mounting block as shown in the article: “Replacing the mounting block on a VAZ” in the first point in the first figure, then immediately pick up small tongs (by the way, they can even be attached to the block, look them there) and pull the desired fuse and pull it out; if there are no tongs, then carefully remove it using your hands.

Note! In its place, the fuse is also inserted all the way, in addition, install a fuse of exactly the same voltage, we indicated this earlier, it is allowed to install a lower value if you don’t have the right one at hand (But it will quickly burn out), but do not install a larger one or even a coin at all In no case is it necessary if you value the wiring and if you don’t want to change it soon!

1. Scheme
2. Old style power supply
3. New model power supply
4. Dismantling and replacement

Fuse blocks installed on old and updated versions of VAZ 2109 cars serve to combine all electrical wiring.

The main task of the power supply is to prevent breakdowns of electrical equipment installed in the car.

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VAZ 2104 fuses

The fuses of the VAZ Four, as in any other car, are designed to open the electrical circuit they protect as a result of the burnout of a special insert. Destruction occurs when the current for which the protective element is designed is exceeded. The current strength of the fuse is selected depending on the permissible load in the circuit it protects and depends on the consumers connected to it. If an emergency situation occurs, the fuse link must first fail, stopping the current supply and saving the machine from fire. The fuse fails for several reasons:

• short circuit, which is possible if the wire insulation is damaged or electrical appliances are installed incorrectly;
• the fuse rating does not match the circuit in which it is installed. This is possible if you incorrectly install a fuse-link designed for a lower current.

Various fuses were installed on the VAZ 2104, but they have one purpose - to protect electrical circuits.
Since the performance of all consumers of the car depends on the condition of the fuses, it is worthwhile to dwell in more detail on their replacement, search and solution of possible problems.