Where is the horn relay for the VAZ 2107 injector?

02/04/2022 17,073 VAZ 2107

Author: Ivan Baranov

The sound signal, also called a horn, plays an important role in ensuring safety on the road, as it makes it possible to attract the attention of other road users. The article discusses the situation when the signal does not work on a VAZ 2107: causes of malfunctions, methods of elimination, the possibility of its repair and replacement.

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Why the signal does not work on the VAZ-2107 and what to do

A car horn is a very important detail that ensures traffic safety and helps prevent collisions with other cars and a collision with a pedestrian who suddenly runs out onto the road. Different car models use different horn designs, but in our article we will talk about the original VAZ-2107. From it you will learn on what principle the signal works, what modifications of it can be used in these machines, and also what to do in the event of a breakdown.

Where is the signal located on a VAZ-2107 car?

The domestic automaker is releasing to the market several modifications of the VAZ-2107 car model, which is beloved by consumers. The design and location of each of them has a number of its own features:

• in some versions of the car, only one sound signal is used, which is mounted immediately behind the front lining of the cooling radiator. In this case, you can easily reach the part and replace it if the need arises;
• A number of modifications are equipped with two sound signals at once. They are installed directly behind the radiator and have different tones, which makes it possible to quite loudly warn pedestrians and drivers of other cars about the possible danger of a collision.

The RS-528 sound signal relay is mounted in the mounting block of both machines, which is often one of the main causes of breakdowns of this part.

In addition, the circuit can include fuse F7, which prevents the supply of excessively high voltage and its surges, as well as a button located directly on the steering wheel.

Checking the functionality of the relay and fuse

What to do if the signal on a VAZ-2107 car does not work, and for what reasons can it fail?
The most common one is a blown fuse. Under increased load, it fails and interrupts the electrical circuit, thereby eliminating more serious emergency situations. If you are faced with the problem of a blown fuse, you must replace it immediately. In addition, you will need to carefully inspect the contacts of this part, carefully clean them of carbon deposits and dirt, or perform repairs.

The next stage of diagnostics is to check the functionality of the sound signal relay. If it clicks when you press the button, then the cause of the breakdown needs to be looked for elsewhere. Otherwise, the relay will need to be replaced, which can be done within a few minutes even without the relevant experience.

We diagnose the signal and its activation buttons

In order to find out whether your car uses a correctly working signal, you should disconnect its wires from the relay and connect them directly to the battery. If the sound does not appear in this case, the causes of the breakdown may be the following:

• contacts located directly in the device body are burnt or heavily soiled;
• The signal is not configured correctly, causing the dial tone to sound very low or not audible at all.

Troubleshooting is done by adjusting the signal (to do this you just need to turn a special screw installed in the back of the case) and cleaning the contacts.

Another reason why the signal may not work is a broken or worn button. To restore its normal functioning, you can either replace the entire part, or again put the contacts to which the wires are connected in perfect order.

As you can see, you don’t have to go to a car service center to diagnose and repair the sound signal. Almost any work can be easily done with your own hands without spending a lot of time on it. We only strongly recommend that you do not delay this, so as not to expose yourself to the risk of a traffic accident due to a non-functioning horn.

What to do if the signal on the VAZ-2107 does not work

Each car owner is obliged to check the functionality of the signal on his car, and in case of a malfunction, promptly fix it.

Horn functions

The signal is provided to anticipate the danger of an accident, as well as to warn pedestrians about the possible danger. The signal is received by pressing a button mounted on the steering wheel. Traffic regulations limit the use of the signal to 2 situations. The first involves informing the driver of the car being led before the maneuver. The situation falling under paragraph 2 of the traffic rules is more extensive. The following are likely:

1. A person is moving through a transition into icy conditions, and the icy surface does not allow the driver to suddenly brake. Of course, a pedestrian will be able to react when he hears a sound signal.
2. The driver who entered the adjacent lane may not have noticed you in the side view mirror and began to change lanes. By signaling, you will be able to attract attention.
3. There may be an animal on the roadway. Using the horn you can drive him out of the way.
4. When leaving a secondary road, your car may not be noticed by another driver heading towards the main one. In this case, the sound signal will help stop his car.
5. A cyclist rides in the center of the road, not from the edge. The signal will force him to let a moving car pass.

And there are many similar situations. Justified and timely use of a sound signal will protect road users and help avoid possible danger.

About the signal of the domestic VAZ-2107

The manufacturer equipped the 2107 VAZ 2 models with 2 signal modifications:

1. The first option is equipped with 2 sound elements. They have low and high tonality (S-304, S-305). This made it possible to obtain surround and loud sound. These components were equipped on a metal bracket under the hood near the cooling radiator.
2. The second option involved installing one signal labeled 20.3721-01. It is also located on a metal bracket in the place where the cooling radiator is located. By the way, all sound parts are non-separable and therefore cannot be repaired.

Sound horn on VAZ-2107: causes of malfunction

A signal failure on the 2107 VAZ model suggests the following:

• the signal completely stopped functioning;
• the sound is very weak and hoarse;
• spontaneous sound signal.

Unnatural sound in the car

After a while, the beep may sound intermittent or quiet. The reason for this action is mainly considered to be a problem with the sound element or poor contact at the terminals. Often water, dirt, and foreign particles can penetrate into the element. As a result, the device is subject to rust, the membrane moves under tension or jams. In addition, it is possible that the problem lies in the winding of the horn coil, although this happens very rarely.

For diagnostic purposes, the sound element is connected directly to the battery. To do this, use auxiliary wires or remove the sound element itself.

If the result is the same, then the sound is faulty. Since it does not disassemble, cleaning it is impossible. It’s time to try to move the membrane while moving the adjusting screw.

Setting up and replacing the signal on a VAZ-2107

The horn can be adjusted without dismantling. This is done this way:

1. The sound elements are adjusted one by one. You should disconnect the power from the element that is not being configured at this moment.
2. By rotating the adjusting screw, you can achieve an extremely clear and loud sound signal.
3. The 2nd sound signal is configured in a similar way, turning off the 1st one in advance.
4. When replacing a damaged sound signal, the power wires are disconnected from it, and the nut holding the element to the bracket is unscrewed.
5. All that remains is to install the new signal in reverse order.

Sound signal circuit and its repair

Sound signal device

The sound signal on the VAZ 2107 comes in the following versions:

1. Two separate signals: type S-304 (low tone) and S-305 (high tone). Mounting - on the bracket, to the left of the radiator.
2. The only non-separable signal of type 20.3721-01, one tone, with a built-in relay. Mounting is on a bracket outside the radiator, immediately behind the decorative grille.

The operation diagram of the sound signal is as follows: two wires are connected to the sound signal itself. The red wire is “plus”. This part of the circuit is constantly energized. The gray-black wire is “ground, minus”; in the normal state it is de-energized, and current begins to flow through it when shorted. The photo clearly shows the color of the wires and two separate signals with brackets.

The “negative” part of the chain is long. When you press the central steering wheel button, the spring contacts close. They are located in the switch housing under the steering wheel.

The slip ring is attached to the back of the steering wheel. Its task is to ensure good contact through friction and provide a signal whenever the steering wheel is turned. Therefore, the ring must be lubricated with conductive graphite lubricant to avoid wear.

Then, the current is transmitted through the wire as part of the engine compartment harness to the switch and relay mounting block. The location of the horn relay (switch) is third on the right (if you are sitting behind the wheel).

Horn relay functions:

• The length of wires and current losses in them are reduced.
• With the help of a relay, a button with a small current can control a circuit with a large load.

Sometimes the circuit does not provide a relay; instead, a jumper that is connected “directly” works. In the case of a single signal 20.3721-01, this is justified, since it has a built-in relay. If there are two “snails”, it is advisable to install a relay to improve operation.

After the relay, the current passes through fuse F7. The new mounting blocks have a 20 A flag-type fuse, yellow. Older units have 16 A fuses. Their lifespan is often insufficient, since this fuse also serves in the cooling fan circuit.

Further, after leaving the mounting block as part of the wiring harness of the engine compartment, the “negative” wire goes directly to the sound signal.

Checking operation and repairing in case of sound signal malfunctions

There are three malfunctions: it doesn’t sound when needed; works when not needed, or sounds intermittently, hoarsely, quietly. Unlike the high-voltage ignition system, which is little affected by the quality of the connection, the horn system is low-voltage. This means that the film of oxides and rust significantly impedes the passage of current. But signals are a powerful current consumer. The current in the circuit is at least 4-5 A.

The quality of all contacts must be perfect, otherwise repairs will be needed constantly. Remember that the car body itself is a “negative” contact, and in the direction of current movement, all oxides settle on the “plus”. Pay special attention to stripping the terminals of the red, “positive” wire.

Removal and Replacement Guide

Changing the fuse box

Replacement of fuses and relays is necessary only if repair is impossible. To dismantle, follow these steps:

Relays play an important role in the health of the system because they perform the operations to turn on or off the necessary functions in the car.

REFERENCE. The mounting blocks use two types of relays; they differ in design and operating principle:

To check the functionality of the relay, you must perform the following steps:

Pinout of fuse box 2107

In the photo, numbers from 1 to 6 indicate relays or connectors for their installation:

The photo also shows components that perform various protection functions (from F1 to F17):

Why the signal does not work on the VAZ 2107

From a road safety perspective, the horn plays an important role in preventing road accidents. On a VAZ-2107 car, depending on the modification, two sound signals of different tones can be installed behind the radiator of the cooling system, or one sound signal, which will be installed behind the front radiator trim.

To put it into operation, a horn button is installed on the steering wheel, and in the mounting block there is a fuse F7 (20A) and a horn relay RS-528. But on some VAZ-2107 cars this relay will not be installed, and in its place there will simply be stand jumper.

If there is no sound signal, troubleshooting should begin by checking the fuse . You need to look not only whether it has burned out or not, but also the condition of its contacts. The horn relay, if your car has one, can be checked quite simply; when you press the horn button, it should click; if the click is not heard, you will have to replace it.

The sound signals themselves can be checked without removing them from the installation site. To do this, disconnect the wires going to it and connect the horn directly to the battery . If there is no signal, a possible malfunction may be burning of the contacts located inside the audio signal housing or a violation of its adjustment. You can adjust the tone by turning the adjusting screw located at the back of the horn housing and gently turning it in one direction or the other.

Another reason for the signal not working may be the power button itself . You will have to remove it and check the condition of the contacts. Malfunctions that arise in the operation of the sound signal on a VAZ-2107 car can easily be corrected by the driver himself.

Hoarse or weak signal sound

The reason may be:

• device misadjustment;
• damage to the insulation of connecting wires;
• oxidation or poor contact in the connectors or signal button;
• malfunction of the device itself.

To eliminate such a malfunction, first of all, we try to adjust the signal using the adjusting screw on its body. To do this, press the button on the steering wheel and, with the signal working, turn the screw using a slotted screwdriver in one direction or the other until the sound of the desired tone appears.

This procedure is most conveniently performed with an assistant. If it is not available, you can use a suitable size block to press the signal button, resting it against the back of the seat. With a paired circuit, we adjust the signals one by one, disconnecting the gray wire of one of them.

If the signal sound cannot be adjusted, check the insulation of the wires, strip and crimp the connector contacts and the signal button, and then try again to adjust the signal sound using the adjustment screw.

If you then adjust the sound signal

fails, it must be replaced. To do this, disconnect the “ground” from the battery, disconnect the wires from the terminals and use a “13” key to unscrew the signal mounting nut

And we remove the signal

We install the new signal in the reverse order. In this case, the wires can be connected to the terminals in any order.

The sound signal, also called a horn, plays an important role in ensuring safety on the road, as it makes it possible to attract the attention of other road users. The article discusses the situation when the signal does not work on a VAZ 2107: causes of malfunctions, methods of elimination, the possibility of its repair and replacement.

About the VAZ 2107 sound signal: features of repair and modernization

Although the sound signal on a car plays a secondary role, driving a vehicle with a faulty signal is prohibited by traffic rules. Owners should regularly check the serviceability of the sound alarm, and this is especially true for outdated car brands, such as the VAZ 2107. If the signal on the VAZ 2107 does not work, then do not despair, sometimes it takes no more than 5 minutes to fix the breakdown. We will find out in detail what types of signal malfunctions occur on sevens.

Sound signal device for VAZ 2107

VAZ 2107 cars are equipped, depending on the year of manufacture, with two versions of the sound alarm. On models since 2000, a sound signal is installed on the VAZ 2107, consisting of two separate devices. One source produces low tones, and the second high. The devices are fixed directly to special brackets and are located on the left side of the radiator, under the grille.

Early models of VAZ 2107 cars are equipped with non-separable sound emission sources that produce only one tone. The product is also mounted on the front part near the radiator. The connection diagram of the element is simple, and in case of failure, eliminating the damage will not be difficult.

The sound signal device for 2 sources has the following form:

1. Two wires are connected to the source of sound creation. One of the wires is red and the other is black. The red wire is the positive contact, which is constantly energized with 12V.
2. The second wire is “minus” - it is de-energized and turns on only when the contacts are closed. As soon as the contacts are connected, current is supplied to the equipment, thereby generating sound vibrations.

The contacts are located on the steering wheel, and when you press the button, they close. Springs with a slip ring are used as contacts. The contact ring is located on the back of the steering wheel and provides high-quality contact when pressing the button. In addition to sources and a button, the design of the VAZ 2107 sound alarm also includes a relay and a fuse. The relay is designed to reduce the amount of current flowing to the device button.

The current level is also monitored by fuse F7, located in the circuit. The size of the fusible link is 20A for injection sevens, as well as 16A for carburetor old versions of the VAZ 2107.

This is interesting! At the same time, the cooling fan is turned on in the sound signal circuit, so frequent problems with blown fuses are an occupational “disease” in sevens.

Malfunctions of the sound signal of the seven

The causes of sound signal malfunctions on the seven are of three types:

1. The AP stopped working completely.
2. The sound appears when you press the button, but it is weak and hoarse.
3. Spontaneous operation of the device.

Each breakdown has its own main causes, so we will consider them in detail.

Weak or unnatural sound

When operating a VAZ 2107, owners are faced with a malfunction such as a weakening of the signal sound. The sound becomes hoarse, intermittent and very quiet. Many car owners are guilty of the fact that the cause of this breakdown is clogging of the membrane with debris, as well as corrosive effects. The problem can be solved by cleaning, but since the device is of a non-separable type, it is impossible to clean it inside.

Replacing fog lamp fuses

The VAZ 2107 has another fuse, which is responsible for the operation of the fog lights. Many “Seven” car owners often cannot find this device. It is located directly under the console central panel. There is a button for turning on the fog lights, next to which the fuse is located. To replace it, you will need to remove the panel. This unit is located in a round oblong contact box. To replace it, you need to remove it and replace it with a new one.

In order to check or replace fusible safety lights, it is necessary to perform the following sequence of operations: