The radio turns off when the engine starts: possible causes and solutions to the problem

Operating principle of radio tape recorders

Car radios have long been an integral part of any car. Even such options as the UAZ Patriot and VAZ 2110-2114 are no exception. The operating principle of any car radio is almost the same and does not depend on the model. When the driver gets into his car and turns on the ignition, all systems are automatically started, including multimedia. Next, the starter is engaged to start the engine. At the same time, the instrument lighting dims, and the radio turns off when the engine starts. When the engine starts, the multimedia system starts working normally again.

It is believed that one of the reasons for this behavior of the radio is that the engine is still cold after starting. As soon as the engine warms up, the radio will not turn off when restarted. The starter is involved in the process of starting the car. It consumes a large amount of electrical energy - at the moment of starting a cold engine, the voltage in the car’s on-board network drops significantly and the radio is simply not enough.

Why does the radio turn off when I turn up the volume?

But turning off the radio when the volume is increased means that the radio is not powered properly! That is, the radio circuit is not supplied with the required voltage of 12V, but a little less; due to these losses, it cannot take as much current as it needs under a certain load.

You can do a simple experiment. We check the voltage on the battery with a voltmeter; it should be approximately 12.5V. We turn up the volume on the radio and the voltage remains virtually unchanged. Now we connect the voltmeter directly near the radio to the power wire. At low volume, the voltage will correspond to the battery voltage, that is, approximately 12.5V. But when you add volume, the voltage will decrease and can be 10V or less. There have been cases, especially on older machines, that the voltage dropped to 8V!

This means that there are huge losses in the wire that powers the radio. Therefore, the radio must always be connected directly to the battery and with a large cross-section wire!

Note: if, when you turn up the volume, the voltage on the battery also drops, then it most likely asks for disposal.

If the power cable is routed from a battery and has a large cross-section, and the problems persist (this happens very rarely), then you need to check the capacitors in the radio itself.

As can be seen in the photo, the capacitors have swollen and become unsuitable for performing their function.

Faulty capacitors on the board

They need to be replaced and the power supply to the radio elements will return to normal.

I would also like to write about capacitors.

Capacitor

A capacitor is like a miniature battery that charges and discharges. Therefore, some people place them in parallel in the power supply circuit of the radio. Of course, there is a rational grain in this. The bottom line is that when the radio tape recorder consumes little energy, the capacitor is charged, and when the radio tape recorder has a peak energy consumption, the capacitor is discharged, and, as it were, helps restore the voltage drop with its charge.

But it is worth noting that if the power is supplied directly from the battery and a good wire, then the capacitor is absolutely not needed, since the power of the battery and capacitor are not comparable and the capacitor will not bring any benefit.

But if it is not possible to provide normal power supply, then a large capacitor placed directly in front of the radio in parallel with the power supply will have a positive effect. The main thing is not to confuse the polarity!

Radio protection system

For the driver, the main goal is to start the engines. Support for any other devices is relegated to the background. All the energy available in the battery is used to operate the starter. The radio does not have enough power and turns off. Many car enthusiasts are very nervous about this, but this is not a minus, but a plus. If the radio turns off when you start the engine, then the voltage is low, and the device, especially of Chinese origin, may not work correctly. To prevent serious failures in the circuitry or software, the system automatically turns off - this is how protective mechanisms work.

When the car has already driven a certain distance and the engine has been turned off, when you try to start it again, the radio will not turn off. The amount of energy increased due to the battery being recharged by the generator.

Manufacturers also took these points into account: most radio tape recorders have a so-called threshold for triggering protective functions. The condition of the battery must be taken into account.

Solutions and tips

To determine whether a car radio is defective, you should remove it from the car and take it to a service center that repairs audio equipment. If a fault is discovered that cannot be repaired, you will have to buy a new device. Speakers with a voice coil impedance of less than 4 ohms should not be used. This will sooner or later lead to failure of the audio system due to overheating and burnout of the power amplifier chip.

To identify and fix speaker problems, you should check your speaker cables for twisted, frayed, or damaged wires. If extensive defects are found, the entire wiring should be changed. You can do this yourself or at a car service that specializes in car audio.

When connecting connectors, you must ensure that the leads do not come into contact with the speaker housings to prevent a short circuit.

To solve problems with overvoltage protection, you can install an additional amplifier or replace the audio device with a more powerful one.

To eliminate the power shortage, you should reconnect the car radio to the on-board network. Wires with a thickness of at least 0.75 mm should be used. The more powerful the device, the thicker the wire. The most reliable connection of the negative pole is carried out as follows.

A stud is found under the instrument panel, which is cleaned of paint, dust, dirt and oil. Then take a piece of wire with a “chip” that has a hole of a suitable diameter. One end is connected to the radio, the chip is put on a pin and screwed tightly with a nut and a spring washer. The positive wire connects directly to the car battery. The connection made in this way will be the most reliable. This especially applies to powerful radios, as well as active subwoofers (with an amplifier).

Connecting the radio

One of the reasons why the radio turns off when the engine starts may be the connection, or rather the diagram of how to do it correctly.

If you connect a multimedia device in series according to the circuit proposed by the manufacturer, then when you start the engine and turn the key from On to Start at the ignition switch, a power interruption occurs.

This problem can be solved by powering the multimedia device directly from the battery. However, there are disadvantages to this connection: the radio will drain the battery. On a cold winter night, the radio can be enough to completely drain the battery.

Reasons why the car radio turns on and turns off immediately

1. Incorrect connection of speakers to the radio may result in it turning off. If the wires are poorly connected to the radio, a short circuit may occur when the car is started.

2. The presence of overvoltage protection can also lead to the exclusion of the car radio. Most manufacturers install special surge protection to extend the service life of the equipment. Therefore, when the volume is increased or the radio is used for a long time, it may turn off on its own.

3. Overheating of the car radio is another reason for its unauthorized shutdown. This mostly happens in the summer heat.

Protective function of the radio

This mechanism is built into some car players. Protection is applied to prevent disruption of the functionality of the device. The fact is that strong voltage surges when operating at high volumes can lead to settings failure or failure of the radio due to burnout of microcircuits. Thanks to the protection, the head unit does not turn off when the engine is started, but only reboots. All settings set by the user remain the same.

The car radio's protection function will work if the battery voltage drops when starting the engine due to insufficient charge or freezing temperature.

Insufficient battery capacity that does not correspond to the parameters of the vehicle also leads to the radio turning off.

Constant shutdown of the head unit occurs due to problems in the ignition switch if the power connection is made through it. This phenomenon is caused by the occurrence of a strong voltage drop across worn or dirty contacts.

Generator problem

Another reason why the radio turns off when you start the engine is a malfunction of the generator. Problems may occur in the voltage regulator, capacitor and rectifier bridge. Due to these malfunctions, the charge from the generator received when starting the engine may be absent or insufficient to maintain the voltage required to operate the radio.

Also, the source of the problem may be a breakdown of the diode bridge or stator.

Because of this, a faulty alternator will put a lot of stress on the battery.

Problems will be indicated by the absence of a light on the low battery indicator in the instrument panel when you turn the ignition key, or by the same indicator lighting up while the engine is running.

The problem is in the starter

Another typical reason why the car radio and other lights go out when starting the engine is a malfunction of the starter. It is the most powerful energy consumer in the car.

If a malfunction occurs in it, the car radio will constantly turn off. The device may also reset if the voltage drop is excessive due to problems with the starter.

The problem is the leak

Current leakage can occur in different parts of the wiring due to damaged insulation or contamination of the battery case.

Because of this, the voltage in the on-board network, when the engine starts, drops more than during operation, which also leads to the car radio turning off when you start the car.

Problems connecting speakers to the radio

Incorrect connection of wires can cause the device to turn off and on randomly. At the moment of a short-term increase in productivity (starting the car). There is a short circuit in the wires with a loose connection, the radio may turn itself off.

You can fix this problem yourself.

Take out the radio.
Check the tightness of the wires to the plugs.
If you find that the connection is not tight, correct it by inserting the wires all the way.

If this does not help, then you need to check the wires for their integrity.

To do this you need:

turn on the radio;
set the noise level to medium;
alternately disconnect and return the speaker plug to its place;
turn up the sound.

If the car radio did not turn off when the volume was increased, then we can assume that the problem is in the wires connecting the radio to the speaker. In this situation, replacing the damaged wire can help you out. If this does not help, it is better to contact the service.

Surge protection installed

Sometimes manufacturers, in order to ensure long life of the device, install a voltage limiter. This reason is very common. That is why many car enthusiasts turn to auto centers with the same question, “Why does the radio turn on and then turn off immediately?”

And if you have tried all the options for troubleshooting the radio, then this case also applies to you. When the volume is increased, the amount of energy consumption increases; when the maximum energy level is reached, the radio turns off. Unfortunately, the service will refuse to fix this problem for you, because if you remove the protection, the device may burn out.

If you really need to remove the protection, you can try the following methods:

Install amplifiers between the radio and speakers to boost power
Check the wires leading from the radio to the speakers; if you find twisted or crushed wires, then the problem lies there. Eliminate twisted wires, or, if the condition of the wires is critical, it is better to find new ones.

Insufficient power supply to the radio.

If the battery is weak, when the engine starts, its power may not be enough to operate all the vehicle systems, for this reason it may turn off. If your battery has enough power, you need to look for problems in the operation of the battery itself.

Car radio overheating

Some car owners may experience overheating of the car radio. Usually this breakdown is detected in the summer. In this case, it is worth checking the cooling elements (radiators) on the back of the radio (where the wires are located). If they don’t work, and the entire back panel is hot, then you should look for the problem in the radiators.

Most of the problems that cause the radio to turn on and off on its own are also related to other car systems, so you shouldn’t be indifferent to this problem, but fix it in a timely manner.

A defect in the radio itself or an acquired malfunction

Factory defects in car radios are not such a rare occurrence. During the production of the radio, various defects could have occurred inside the device's microcircuits, which lead to short circuits and other operational problems. To understand why the radio turns off when you turn up the volume, you will have to remove it from the car and take it to a car service center or service center so that specialists can diagnose the audio system.

Lack of car radio power supply

When you turn up the volume on the speakers, the radio may also turn off because the cross-section of the wires cannot withstand the load, causing the fuse to trip. To solve this problem, you need to change the wires to thicker ones, and also power the radio directly from the battery. In 90% of cases, this helps to get rid of problems in the operation of the radio, as well as improve its performance: the device will work even when the engine is started, with the cigarette lighter working and the phone being charged.

Current leaks in the on-board network

If the radio turns off when starting the car, then the problem may lie in so-called current leaks. That is, when the ignition is turned off, there are consumers that discharge the battery. Overnight, due to these leaks, the battery can completely die. In order to solve the problem, you need to detect the leak and find its culprit. It can also be a radio, alarm, central locking and other systems.

When you start the engine the amplifier turns off

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Who can tell me about this amplifier https://www.kenwood-r. -PS541/details/, does it have an adjustment for overvoltage protection? When the engine is turned off, everything works; if you start it, it doesn’t. Previously, it was in another car and, according to the owner, everything worked.

#4 OFFLINE egor74

Wires

This is another reason if the radio turns off when you start the engine. It could be all about the wires. Radio tape recorders are often connected with thin, low-quality wires. They have insufficient characteristics and multimedia is unstable.

A solution to the problem may be to replace the power cables of the radio with copper analogues with a cross-section of 2.5 mm. This allows you to completely forget about rebooting and turning off the radio. Also, the music does not turn off when the volume is increased. This method can be used to prevent the radio from turning off when starting, but it will only work normally with a relatively new battery.

Disabling the 2DIN radio when starting the engine

Post by Yuri_p » 13 Nov 2011, 18:19

Post by hunix » 13 Nov 2011, 19:17

Isn't it easier to turn off the consumer? it's much more practical! that same winter! Instead of music, is it better to save voltage for a reliable start? I personally am used to this and always, especially in winter, turn off the power supply (music and even sometimes the stove) before parking for 5 minutes!? I'm creeping up quietly! and that's it! then after a day of leaving the car in the cold, at least (ugh ugh) if it doesn’t start, I won’t wonder if this is why the battery died.

and don’t count the stone EXACTLY in your garden! but I see people on our forum have become very obsessed with electrics and are already reaching electronics! No one would ever think about removing the guarantee if something happens. everything is absolutely fine. We have Kulibins and self-taught people or just literate people on the forum! but this can also be harmful! So a new person will come to the forum to see enough, but he himself has a 3rd grade education! Only incandescent lamps can be changed to energy-efficient houses! He'll get into his car and watch it, and he'll shut everything down there! okay, God forbid the car burns down! this is no joke! In general, you need to contact the admin to notify everyone! that everyone does all experiments at their own peril and risk! no remarks on straight arms! I’m kind of straight myself! but you will understand from the text. I write with errors! something like that!

Post by VS » 13 Nov 2011, 19:31

Post by Yuri_p » 13 Nov 2011, 19:41

Post by hunix » 13 Nov 2011, 19:50

Well, yes?! I only get my information from the forum! damn, but admit that we are all not children and everyone is at least at least 18?! (before 18 they won’t even sell your license!) probably??) but the majority of people, leaning towards the simplicity and cheapness of ours (nouhao), can take the next photo report as a guide to action! What I mean is that chain schemes or other things (inventions and improvements) should be tested first and not throw pilot projects at the masses. I repeat, I DO NOT MEAN THE AUTHOR OF THE TOPIC. cases were about how a report was written and a week later the information was thrown out that, excuse me, I was wrong, did I connect it wrong, did I secure it, did I interrupt it? SORRY for being off top?! but how is that not responsible?! Are we real users of the Japanese automobile industry?! and we also have to think about how they are?!

Sorry again, didn’t mean to offend anyone?! (if offended)??

Source

Starter

Sometimes the battery may have nothing to do with it, and the problem may be hidden in the starter. During the operation of the latter, its parts are subject to wear. If the starter bushings are worn out, the shaft may get stuck in them and more energy must be spent to turn it. Hence the shutdown of most electrical consumers.

To correct this malfunction, an inspection of the starter is necessary. It is necessary to check the brushes, commutator, replace worn bushings, and lubricate the mechanisms. After such a revision, the starter will work like new, which means it will need less voltage.

How to recognize the cause of the problem

To recognize the cause of a problem with the device, you must carefully read the instructions for the TV, check the settings, inspect the TV, and the power supply. And, of course, check the outlet to which the device is connected.

If the reason is in the power supply, then when you turn the TV on and off, the following will happen:

The screen does not respond to the control panel in any way;
The indicator lamp on the device panel does not light up;
The TV goes out a couple of seconds after being plugged into the network.

If the problem lies in voltage drops, then it is worth measuring the voltage using a special device.

It often happens that the cause lies on the surface and is easily eliminated.

If it is impossible to independently identify the cause of the TV breakdown, you need to contact a specialist.

Refinement of the radio

Car enthusiasts modify their radios themselves if they did not take this moment into account. To solve the problem, you will need 2 elements - a 22,000 microfarad capacitor with a voltage of 25 V, as well as a 10 A diode (the diode must be selected based on the fuse ratings in the radio). In this circuit, the diode will serve as a valve - it will not allow the capacitor to power the on-board system of the car, but will only power the radio.

The scheme is simple. A capacitor is soldered between the power wires of the radio. A diode is soldered onto the positive wire with the positive contact to the “+” of the capacitor.

How the device works

The radio has long become an integral part of any car. The UAZ Patriot, VAZ 2110, VAZ 2107, VAZ 2114 models were no exception. The principle of its operation is almost the same for them. As soon as the driver gets into the car, he turns on the instruments and multimedia system. Then he inserts the key into the ignition and turns it. This causes the starter to provoke engine operation and the following picture occurs: the instrument lighting becomes dim for a few seconds, and the head unit stops functioning. This phenomenon stops as soon as the internal combustion engine starts working.

The reason for this operation is that the engine has not yet warmed up. Once it is resolved, restarting it will not lead to similar problems. If the engine is preheated, the radio will not turn off. Since this process involves a starter, which is shown in the photo below. It consumes a large amount of energy, which leads to a sharp decrease in voltage in the on-board system of the vehicle UAZ Patriot, VAZ 2110, VAZ 2107, VAZ 2114.

How it works?

So. When the driver starts the car, the starter takes on most of the voltage, so the radio turns off when the engine starts. To prevent the multimedia system from turning off, a diode and a capacitor are used.

The main supply voltage to the radio goes through the diode and charges the capacitor. When the ignition is turned on, voltage will flow through the diode and charge an additional capacitor. When the starter is operating, the voltage in the on-board network sags. The diodes do not allow the voltage in the capacitor to go into the network - all the charge will go to the radio, so that the radio does not turn off when the engine starts. To operate the latter for 5 seconds, a capacitor with a capacity of 470 uf is sufficient.

How to prevent the radio from turning off

The generator and starter need to be checked. A short circuit in the windings is determined by their darkening or heating of faulty parts and components. Leaks in the battery case can be detected using a tester. To do this, touch one of the battery terminals with one probe of the device, and touch different points of the case with the other. A deviation of the arrow will indicate the presence of a leak. To eliminate it, you should wipe the car battery case. The tester will also help you more accurately check the starter, generator and wiring for short circuits or leaks. Faulty parts and assemblies must be replaced.

You can prevent the radio from turning off when you start the engine by replacing a worn or weak battery with a more powerful one if its capacity does not match the engine parameters. As a result, the voltage in the vehicle’s on-board network will drop less when the engine starts. It is necessary to check the car wiring for damage.

If the radio was connected through the ignition switch, then it is recommended to connect it directly to the battery. This helps relieve the load on the ignition switch and will protect the receiver from turning off when starting the car engine. If the radio continues to turn off, it should be turned off manually before starting the engine, and then turned on again.

Mystery MMTD 9122S
The radio does not turn on
The radio turns off when the volume is increased
How to make a linear output in a car radio

Radio and ignition switch off

#1 lavvash

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#3 Guest_Yuri_*

Colleagues, is it possible to make sure that when you turn off the ignition the standard radio does not turn off? Otherwise, it’s very inconvenient if you’re standing there waiting for someone, the radio turns off along with the ignition.

#4 lavvash

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Post edited by lavvash: 07 June 2012 - 12:40

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This method is not interesting. - I’m talking about pressing a button and it will work for an hour - this is of course good, but it still turns off and needs to be turned on again. I want it to turn off when I turn it off.

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impossible to do. This is the curse of Ford cars

Exactly until (judging by desire) one day you have to run along the beach looking for wires and a car to light a cigarette

#9 lavvash

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This method is not interesting. - I’m talking about pressing a button and it will work for an hour - this is of course good, but it still turns off and needs to be turned on again. I want it to turn off when I turn it off.

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Post edited by alpriv: 11 December 2012 - 14:56

#13 niv26

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please help with practical advice, installed the multimedia device in a standard place, adapted, when the car is started, the stations of the manually entered sound settings are erased, if the starter is not turned, everything is saved, as if at startup the computer turns off unnecessary consumers in order to create a reserve of energy for the starter, but sometimes everything is fine 75/25

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Colleagues, is it possible to make sure that when you turn off the ignition the standard radio does not turn off? Otherwise, it’s very inconvenient if you’re standing there waiting for someone, the radio turns off along with the ignition.

Good day to all. Since I can’t open a new topic (I’m still green), I found a similar one. We haven’t found a solution in this thread yet, so I decided to raise this issue again. I have this problem in the manual and, after reading it on the forum, with the engine off, the mafon should work for at least one hour. This is what the radio shows on the screen. But in operation the mafon is cut off after a minute or two; putting it on the netralka in position N was not successful. Maybe someone can tell me where to point with crooked fingers. I will be glad for any help.

#17 russkijrubin

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Good day to all. Since I can’t open a new topic (I’m still green), I found a similar one. We haven’t found a solution in this thread yet, so I decided to raise this issue again. I have this problem in the manual and, after reading it on the forum, with the engine off, the mafon should work for at least one hour. This is what the radio shows on the screen. But in operation the mafon is cut off after a minute or two; putting it on the netralka in position N was not successful. Maybe someone can tell me where to point with crooked fingers. I will be glad for any help.

What is the problem?

To understand the problem in more detail, let’s look at how everything happens in detail:

The ignition key is in position 0, and the music turns on (no interference, the radio does not disappear, everything works perfectly, no hiss);
The key is turned half a turn and the ignition is turned on (interference begins, the radio disappears and appears, hisses);
The key is turned a full turn, the engine starts (the noise increases, the radio may disappear completely if you press the gas pedal - the unpleasant hiss increases in proportion to the engine speed, the radio disappears or suddenly appears).