Motorists could repeatedly notice that in the process of starting the engine, or rather turning on the starter, the car radio is turned off. The device shuts up for just a few seconds, and then turns on. Most often, this situation can be observed with abnormal devices. Let's find out what to do when the radio turns off when the engine starts.
The principle of operation of the radio
Car radios have long been an integral part of any car. Such options as UAZ "Patriot", VAZ 2110-2114 are no exception. The principle of operation of any car radio is almost the same and does not depend on the model. When the driver gets in his car and turns on the ignition, all systems, including multimedia, are automatically launched. Next, the starter is activated to start the engine. At the same time, the instrument backlight 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, then when you restart the shutdown, the radio will not follow. In the process of starting a car, a starter is involved. He is a consumer of a large amount of electric energy - at the time of starting a cold engine in the on-board network of the car, the voltage drops sharply and the radio tape recorder is not enough.
Radio protective system
For the driver, the main goal is to start the engines. Support for any other devices is relegated to the background. All available energy in the battery is used to operate the starter. The radio tape recorder does not have enough power, and it turns off. Many motorists are very nervous about this, but this is not a minus, but a plus. If the radio turns off when the engine starts, the voltage is low, and on it the device, especially of Chinese "origin", may not work correctly. In order to prevent serious malfunctions in circuitry or in software, the system automatically shuts down - this is how defense mechanisms work.
When the car has traveled some distance and the engine has been turned off, the radio will not turn off when you try to restart it. The amount of energy increased due to recharging the battery with a generator.
Manufacturers took into account these points: most radio receivers have the so-called threshold for the operation of protective functions. It is necessary to take into account the condition of the battery.
Radio connection
One of the reasons why the radio turns off when the engine starts, may be the connection, or rather the scheme of how to do it right.
If you connect the multimedia device in series according to the scheme proposed by the manufacturer, then when the engine is started, when the key is turned from On to Start, a power interruption is formed on the ignition switch.
You can solve this problem if you power the multimedia device directly from the battery. However, in such a connection there are disadvantages: the radio will land the battery. On a cold winter night, the radio may be enough to completely drain the battery.
Current leaks in the on-board network
If the radio turns off when the car starts, then the problems may be in the so-called current leakage. That is, when the ignition is off, there are consumers who discharge the battery. During the night, due to these leaks, the battery can completely “drain”. In order to solve the problem, you need to detect a leak and find its culprit. It can also be a radio, alarm, central locking and other systems.
Wires
This is another reason if the radio turns off when starting the engine. The whole thing may be in the wires. Often, radio receivers are connected with thin substandard wires. They have insufficient characteristics and multimedia is unstable.
The solution to the problem could be replacing the radio power supply wires with copper analogs with a cross section of 2.5 mm. This allows you to forget about rebooting and turning off the radio at all. Also, music does not turn off when you increase the volume. This method can be used so that the radio does not turn off at startup, but normally it will only work with a relatively new battery.
Starter
Sometimes the battery may have nothing to do with it, and the problem can hide in the starter. During operation of the last part it is subject to wear. If the starter bushings are worn, then the shaft can jam in them and more energy needs to be spent to rotate. Hence the disconnection of most electrical consumers.
To correct this malfunction, a starter revision is required. It is necessary to check the brushes, the collector, replace the worn bushings, lubricate the mechanisms. After such a revision, the starter will work like a new one, which means that it will need less voltage.
Finalization of the radio
Motorists modify their radio themselves if they did not take into account the moment. To solve the problem, 2 elements are needed - this is a 22,000 MKF 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 scheme, the diode will serve as a valve - it will not allow the on-board system of the car to be fed to the condenser, 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 to the “+” capacitor on the positive wire with a positive contact.
How it works?
So. When the driver starts the car, the starter takes over 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 power supply of the radio goes through the diode and charges the capacitor. When the ignition is turned on, the voltage will go through the diode and charge an additional capacitor. When the starter is operating, the voltage in the on-board network sags. Diodes do not allow the voltage in the capacitor to go into the network - all the charge goes to the radio so that the radio does not turn off when the engine starts. For the latter to work for 5 seconds, a capacitor with a capacity of 470 uf is enough.
Other solutions to the problem
Experienced motorists recommend other options. You can purchase a high-capacity battery, and then this malfunction can be forgotten forever. You can also purchase cheaper multimedia systems - they are less demanding on quality and voltage stability. If the radio with rectifier turns off after starting the engine, then it may be worth checking the wiring for possible errors.
Conclusion
With the help of these tips, many motorists defeated this problem. A capacitor and a diode help a lot. If the capacitor with the diode did not help, then you need to check the wiring, starter, generator operation and change the battery.