Why don't car alarms go off on some Tula streets?

Typical causes of car alarm malfunction

In principle, the general scheme of a car alarm is not too complicated, and determining why the alarm does not work is quite simple. Not many components can fail there. Let's determine the places where the problem may lie and why the alarm does not go off:

• Lack of power. It is characterized by the fact that there is no reaction to an attempt to set the car alarm or remove it from it.
• Fuses have blown.
• The problem is related to the wiring.
• The “brain” of the system is frozen.

Naturally, when the owner approaches the car and tries to interact with the alarm, but nothing happens, it is impossible to understand with a simple glance why the alarm is not working, and which particular reason is to blame for the breakdown. It is necessary to look at cause-and-effect relationships and try to repair the car alarm yourself.

And only if the measures taken do not lead to success, contact the specialists of service centers, who will thoroughly understand where exactly the breakdown occurred.

Features of car alarm repair, causes of malfunctions and their elimination

Modern alarm systems are divided into several types. Some are connected using the standard method - using wires, others are wireless, and another category involves combining these two types of connection. Each person, when choosing a security system, is guided by his own ideas about the ideal car alarm and is guided by his financial capabilities. The reliability of all security systems is confirmed by quality certificates, but one small breakdown is enough for the entire mechanism to stop working smoothly. Motorists can now find out why alarms break and how to repair them.

The alarm system is faulty, needs diagnostics

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It contains a microprocessor control unit connected to a signal supply device and sensors. In addition to these elements, there is also a device that controls the activation and deactivation of the alarm: a key fob with a battery. A malfunction can occur both in the key fob and in the alarm control unit. The most vulnerable are peripheral alarm devices that have mechanical parts - door switches, lock drives or a key fob button that controls it.

Before you panic at the sight of a car that is locked and will not open, you need to carry out a series of tests, described, as a rule, in the instructions for the device.

Alarm malfunction is the consequence of not being too careful or untimely servicing of the device

Theoretically, problems can arise anywhere, but in practice, given the quality of modern electronic components, a “malfunction” is often just the negligence of the owner, who did not, for example, replace the battery in the control key fob on time. The most common causes of alarm failure

There are several typical reasons for unexpected alarm failure, and all of them, ultimately, can be attributed to the consequences of not too careful or untimely maintenance, which the owner himself should have attended to. However, sometimes refusal occurs for reasons beyond his control.

The alarm does not respond to the key fob and shows no signs of life

Component failure when exposed to strong external radiation. Since the alarm unit is assembled from standard parts, it is necessary to understand that it is not protected from external radiation, which can interfere with the operation of the alarm and even damage the microprocessor - the basis of the electronic unit.

Really strong radiation in the city is rare, so cases of failure due to its impact are usually characterized by the disappearance from the memory of the program block (the so-called firmware) on which the alarm operates. As a rule, this is solved by calling a specialist from the car service center who installed the alarm and reflashing the unit.

Typical malfunctions: signs and causes

First, let’s look at the signs by which you can determine if the alarm is not working:

For what reasons can the alarm break down and stop working:

1. No power to the key fob. In this case, the operation of the motor may be blocked, the car alarm will not respond to signals sent from the remote control. Before disassembling the central unit, check the functionality of the key fob; perhaps it just needs to change the battery.
2. There is a malfunction in the signal power supply circuit, that is, problems in the wiring. For example, the alarm power wires could be damaged, or the problem could be oxidation of the contacts. It is necessary to test the electrical circuit to identify breaks.
3. Turning on and may not be possible due to the control module freezing. Usually the central control units of anti-theft systems work flawlessly, but it can happen that the device simply freezes. In this case, you should disconnect the battery from the power supply and then connect it again, or disconnect the unit itself from the network.
4. Failure of the safety device, in other words, the fuse has burned out. Depending on the wiring in the car, it is possible that the failure of a relay or safety device can lead to a breakdown of the alarm.
5. Initially, mistakes were made when installing the shock controller or immobilizer. Or the installation of the anti-theft system was carried out by unqualified craftsmen. First of all, it is recommended to check the shock sensor.
6. Lack of signal between the control panel and the electromagnetic drive of the system. If the diagnostics showed that the wiring is intact, and when voltage is applied to the drive, the system starts, then the operation of the control unit should be checked.
7. If only one or several doors do not close, then perhaps the reason lies in a break in the wiring that is supplied to a specific door (the author of the video about repairing the key fob display is the Hold1904 channel).

Starline key fob repair

Another weak point in the Starline alarm system is its remote control. More precisely, his body. There are frequent cases when it, along with the keys, falls out of your hands. As a result, the remote control screen may stop working properly or may not display information at all. In this case, it is necessary to repair or replace it.

It is very difficult to find a place where they can repair the Starline key fob. Usually service centers offer a complete replacement. And purchasing such a device costs a lot of money. It is worth noting the fact that you will have to pay not only for the remote control itself, but also for its connection to the system, that is, the firmware. And all this is very expensive for the user.

The rationality of such a purchase could be justified if the key fob is completely broken. But in our situation, only the case is damaged and the LCD screen does not work. It seems that it makes more sense to repair the Starline remote.

Failure of the unit to operate when the body is hit, provided there is a shock sensor

This malfunction is usually a consequence of unqualified installation and configuration of the alarm. The shock sensor needs to be configured, and it is not always done correctly. If the alarm is working, but does not respond to an impact on the body, it may be necessary to re-set it.

Alarms that go off too often and unreasonably

The reason for the incorrect operation may be the same shock sensor, set to too high a sensitivity. At the same time, the alarm is triggered even by gusts of wind, which it mistakes for blows to the body. In this case, adjustment of the sensor sensitivity is also required.

The alarm does not respond to the key fob

First of all, in this case, you should check the power source of the key fob. If the battery is working, you need to make sure that the buttons do not stick and press the contacts inside the case. If the battery is in order and there is no mechanical damage to the buttons, you need to buy a new remote control and, contact the installer, “register” it in the program that controls the alarm’s actions.

The key fob works, but the doors don't open.

Provided the unit is operating correctly, you should look for the place where the signal is lost between it and the electromagnetic drive, and if the wires are intact and “ring” with a multimeter, you should replace the drive. If all the electrics are intact and the drive is triggered when current is supplied to it from an alternative source, it is necessary to deal with the alarm unit, which may be sending an incorrect impulse to close the doors.

The alarm goes off and the car is armed, but the siren does not sound

There may be no current flowing to the siren unit. In this case, you should look for a break in the wiring.

Not every motorist can discover the cause of an alarm malfunction on his own. If you understand that your knowledge is not enough, it is better to contact the service that installed the alarms.

The alarm is blocking the engine: how to remove the blocking

The car alarm set includes an immobilizer responsible for “recognizing” the owner. After identification by a special mark, the car owner will be able to start the “heart of the car.” But often people are faced with a dilemma when the signal does not allow them to do this. This often happens to owners of new cars equipped with newfangled security systems.

Maintenance specialists assure that the main reason for failure to start the engine is a malfunction of the alarm system. What to do if suddenly such a misfortune happened? What is the reason for what happened?

In general, it would be a good idea to start by figuring out whether the car alarm is actually at fault here. Carrying out computer diagnostics of the car can help with this. Sometimes it turns out that the reason lies in the operation of the standard immobilizer.

In some cars it is capable of slowing down the starter, in others - transferring fuel or starting the ignition. Other malfunctions of the control elements cannot be ruled out. Therefore, only computer diagnostics can give an accurate verdict.

The most rational solution to “revive” the engine would be to return to factory settings. This is where the operating instructions come to the rescue, which the owner will find in the accompanying documents for the car. It is best to keep such things in the glove compartment so that they are always within easy reach. Of course, you can use search engines, where almost any instruction manual is available for download.

The engine is blocked in several ways:

• Lost connection of the solenoid relay - to the starter;
• Program block - via can-bus;
• Along the pump circuit, where the fuel-air mixture is pumped;
• Blocking the functioning of nozzles or injectors.

It is necessary to begin to deal with the malfunction from the main unit of the alarm system. It is usually located under the instrument panel, namely behind the safety block, to the left of the pedals. The location, of course, is not the most accessible or comfortable for work, but nothing can be done.

There are additional ones located not far from the main safety block; it is also recommended to check them carefully. The technician will have to spend a lot of patience and effort to examine the case and open access to the fuses.

Using careful movements, remove the block from where it is attached. Close attention should be paid to the insulation of the wires and the degree of fit of the fuses themselves. Experienced specialists are aware that only heat-shrinkable pipes should be used to fasten wires. This prevents moisture from entering.

If the car alarm was installed via a can-bus, then fixing the problem will not be difficult - remove the bus and be done with it. This is done very easily - just open the contacts.

Nothing helped? Then the next step is to check the relay: gradually check each wire. Using a gentle screwdriver, open all contacts blocking the relay. A special multimeter or circuit shown on the block will be an assistant.

If you are not successful this time, try carefully opening the relay cover with a knife. To examine the relay, you should press the anchor located inside. But, this will be useless if the relay is functioning. So be sure to find out if it responds when power is applied.

Some cars have modern alarm systems with auto start. The sheriff, by the way, is also equipped with this function. In this situation, the immobilizer easily fails. It's probably due to damaged wiring leading to it.

His crawler is located behind the steering column not far from the safety block. Carefully pull it out and ring it. Once you find the damaged wiring, you should replace it. When looking for a wire, do not forget that it must have similar resistance parameters. Otherwise, instead of solving one problem, several new ones will be added.

Engine blocking with car alarm

If the car is protected by some kind of alarm system, then the electrical equipment is responsible for starting the engine. As mentioned above, anti-theft systems often fail. It is important to understand that the scale of the problem does not depend on the brand of the vehicle, but on the complexity of the installed security system.

The main sign indicating a car alarm malfunction is a failure to start the engine or stopping its operation immediately after it starts. The engine may not start either with the key fob or with the key. This is what speaks of complete or partial blocking.

Here are a few more “symptoms of the disease”:

• Flashing signals of a light bulb operating in abnormal mode;
• Notification of a locked lock on the key fob display after security deactivation;
• The siren is screaming;
• Emergency light signal;
• Abnormal functioning of alarm keys;
• The central locking does not respond to commands issued by remote controls.

Often the problem occurs when a two-way security system or immobilizer is installed. Quite often, one of the root causes is the inability of the alarm system to recognize the key. It happens that everything is much deeper, but we will talk about this in detail below.

Accidental activation of the engine lock function

Often, drivers themselves inadvertently activate the blocking function. To verify whether this is actually the case, you need to pay attention to the images displayed on the key fob display. It would not hurt to check the parameters of the LED indicator light, if there is one. It is she who demonstrates the light indication of the alarm system. A flashing signal confirms that the anti-theft protection is activated.

What should you do if, after turning the key in the lock and ignition, the indicator blinks frequently before starting the engine, but the key fob display displays the inscription “immo”? There are two ways to solve the problem:

• Remove the key and then press the central locking button;
• Leave the car, turn on the security mode, then deactivate it and try to start the car again.

Simply put, the owner must make sure that the alarm works as normal. About 30% of motor blocking occurs due to accidental resets. Therefore, you will have to spend time to be able to figure it out and disable unnecessary functions.

Some alarm systems have a two-step block removal process. You can also activate the function accidentally. The current state of the engine can be understood from the pictogram shown on the display. To deactivate the function, just press and hold key number 3. After two short signals, you must press the same button once again. Next, briefly pressing key No. 1 will remove the security mode.

Disabling locks using the service button in the cabin

Valet is a special service mode used when the cause of the engine block is not an accident. To activate it, you need to turn the ignition on and off using the key.

After such manipulations, you should press and hold the service mode start button in this position for some time. This takes approximately 10-20 seconds. The result will be indicated by a short-term signal, after which the LED light will turn on and remain lit continuously. This indicates that all functions are deactivated. The motor block option may also be disabled. After fixing the existing problems, do not forget to turn on the car alarm again.

In the car interior there is a hidden button intended for emergency deactivation of the alarm. This key is also pressed, held for about 20 seconds, and then the LED element begins to glow and immediately goes out. After waiting for the LED light to go off, try to start the engine.

The Valet button is small, located at the end of the two-wire wire. When exposed to it, it helps close the circuit. It is a jumper located between the contacts of the electronic car alarm unit. The button is located at the very end of the wire for safety - away from the central unit.

If the car owner does not know where the service button is located or has purchased a used car, the vehicle must be disconnected from power during the search period. This is easy to do - just remove the negative terminal from the battery. This will ensure the machine is “silent” while the owner is looking for the treasured button. Once you find it, you can turn off the car alarm.

As we said above, the functioning of the Valet mode is based on the principle of opening and closing contacts. At the same time, ordinary programming and the introduction of various codes for control are carried out. For example, a code for emergency deactivation of an alarm system.

Independent troubleshooting of alarm systems

Is it possible to figure it out on your own by finding problems? Most likely yes. See for yourself:

• Try to find any blown fuses. They are often the most common cause of car alarm malfunction. Try to check their safety carefully and carefully. If a burnt element is discovered, it is recommended to completely replace it with a new one;
• The terminals are poorly attached to the contacts or the battery is not charged enough - these are two more situations when the car alarm may fail. The battery may slowly crank the starter, but the engine block will work and will be an obstacle to starting the internal combustion engine. When the battery is completely discharged, an additional option will turn on, blocking the engine due to a power interruption or voltage in the vehicle electrical circuit;
• Another way to detect a malfunction is to inspect limit switches. Their usual location is the hood or luggage compartment. Often the limit switch sends an incorrect signal to the security system control unit if it gets wet or is oxidized.

Incorrect installation and configuration of car alarms, limit switches, and even careless, incorrectly carried out engine washing - all this can easily cause electrical equipment failures.

Resetting the car alarm

A car alarm, at its core, is also a mini-computer with a small number of functions. And, like any other computer, it can sometimes freeze. That is, the “brain” of the security system stops responding to all manipulations.

In this case, rebooting the system can help - to do this, you need to lift the hood, remove any terminal from the battery, then wait 3-5 minutes and return it back. This will turn off the power supply and the system will start again. Now you can check the functionality.

Important! When performing these actions, the security system will most likely be activated. This is a normal alarm reaction to manipulation of the battery.

If this does not help, then look further.

Fuse failure

The following fuses should come under close attention: on the positive wire of the battery, for emergency lights, for sound.

You can check them by visual inspection or using a tester.

Video “Do-it-yourself alarm unit chip repair”

Educational information on repairing the alarm unit microcircuit at home is presented in the video below (the author of the video is peling dot).

Instructions

It may happen that there will be no reaction to your attempts to disarm the system using the remote control. The siren will not “croak”, will not blink and, most importantly, the door locks will not open. There may be several reasons for such a reaction, or rather, its absence: 1. The battery in the remote control is dead or the remote control is faulty.

2. Communication interference

4. The alarm unit is faulty

It is necessary to look for a malfunction in the system using the simple elimination method. Start with the keychain. Change the battery in the remote control. If you have a remote control with an LCD display, the battery charge will be clearly visible there and a warning sound will be issued periodically. If you have changed the battery, but the car does not respond to the signal, take a second key fob (there are always two of them in the alarm kit) and try to disarm it. If everything works, then the first key fob is faulty or needs to be reprogrammed.

If both key fobs cannot disarm the car, unlock the car door with the key, the siren should scream. Find the Valet button - the button to turn off the alarm. The location of this button must be shown to you at the installation center! Open the instructions for the alarm, point “Emergency removal of the alarm without a remote control.” And according to the instructions, you manipulate the ignition and the Valet button. If you did everything correctly, the siren will stop screaming and the alarm will respond to the remote control.

If, when you turn on the ignition, the lights on the instrument panel light up faintly or the “battery low” sign is on, the car will not start, the siren constantly screams, it means the car’s battery is dead. To turn off the siren, remove the terminal from the battery. If the siren is autonomous, turn it off with the key. Remove the battery and charge it, or light it with wires from another car. As a rule, such an alarm malfunction occurs in severe frosts. If you have a weak or old battery, do not park your car for long periods of time in cold temperatures. After removing the battery, the alarm settings are lost and the remote control will have to be reprogrammed.

If all of the above steps did not help, then look for the alarm unit under the dashboard and disconnect all the wires from the connectors of the unit. Try starting the car. If it does not start, it means that the ignition, starter or fuel pump are blocked. To disconnect them, find the wires going from the alarm unit to the car's standard wiring harnesses. If the standard wire in the harness is cut through and wires from the alarm are connected to it, then this is a blockage. Disconnect the alarm wires and connect the ends of the standard wire together. If there is only one lock and you have found it correctly, the car will start.

A car alarm is a system designed to protect a car from burglary and theft. If the signal system malfunctions for some reason, this may jeopardize the safety of the vehicle. Why it doesn’t work - the reasons and options for eliminating them are described in detail in this article.

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Problems with car alarms while on the road

Alarm malfunctions occur quite often and are expressed in the fact that the car cannot be armed, or, on the contrary, it is not disarmed.

For these cases, there are only three tips:

• check the key fob battery;
• bring the key fob closer to the approximate location of the central unit and try again;
• perform the above-described manipulations with the battery, rebooting the alarm

False alarm

It also often torments car owners; it can trigger and stop working at any time. This situation hints that a personal car alarm needs repair. Often this behavior is associated with a complete or partial discharge of the battery. This is a protective reaction of the “guard”, which is associated with a voltage drop below 8V. Once the cause is eliminated, the unpleasant moments also disappear.

Problems with personal vehicles can be very different and there is not always a need to contact specialized service centers. Often, most troubles are so insignificant that you can cope with them on your own.

For example, repairing car alarms is easily done with your own hands, in half of all known cases. Because the problem turns out to be not too complicated, and its solution lies on the surface.

Alarm faults

Nowadays, a huge number of technical services are engaged in repairing car alarms. In addition, they offer their services for reprogramming key fobs, as well as other work related to car security systems.

It is noteworthy that it is precisely such repair work that is becoming one of the most common services of small and beginning car repair shops. Probably because these actions sometimes do not require special knowledge, and banal erudition can tell you how to deal with electronics that have gotten out of control.

The most common problems that may cause the alarm to not work and that motorists encounter are:

• unsatisfactory operation of the key fob, which does not control the alarm;
• the alarm turns on independently or, on the contrary, does not respond to influences;
• It is not possible to disarm the car alarm.

All these problems are fairly easy to fix. If there are problems with the key fob, then first you need to check the battery, since most cases of the key fob not working are associated with the battery.

When it turns out that the battery is fine, the key fob may need to be reflashed. The instructions for the alarm will tell you how to perform operations to flash the microchip. You can also contact the service center. Just like a non-working battery, the need for flashing is one of the most common problems.

If the above actions did not help and the car cannot be locked, then repair of the car alarm system is necessary. The center in which it was installed, or almost any other in the city, will help solve this problem.

You can also do some activities yourself. Before you begin repairing and troubleshooting the alarm system, you need to carry out diagnostics and find out the cause. The breakdown of alarms is individual in each case, so it is not always possible to solve this problem in a formulaic manner. Only after diagnostics will service specialists determine the specific problem and be able to repair the electronics.

At the same time, in a good technical center, before offering to purchase a new part instead of a non-working one, they will first try to repair it, since in this case there is an opportunity to significantly save customers money. Sometimes repairs will be several times cheaper.

Ways to turn off the alarm

If after the above diagnostics the problem is still not solved, you need to turn off the alarm manually. First of all, under the hood you need to find where to install the alarm. After this, de-energize the contacts of the speaker emitting the siren.

It is better to hide the Valet button not in the most obvious place. Photo: car-key.by

The alarm can be turned off using a special hidden button located in the car interior, under the instrument panel. It's called Valet. The rules for using this button can be specified in the instructions supplied by the car alarm manufacturer. If it is missing, then after detecting the button, you need to carry out the following actions:

If there is an alarm system with a GSM communication standard, you must read the instructions, which indicate instructions for entering a PIN code. After its introduction, the vehicle starts and the alarm loudspeaker is connected.

In any case, try to act according to the instructions that came with the alarm.

Below we will tell you how to deal with the most common alarms.

Disabling alarms of popular models

Starline (525)

To turn off the alarm, you need to follow the instructions:

1. Opening the car interior;
2. Turning on the ignition;
3. Hold down the service button for no more than 6 seconds. If the above steps are performed correctly, the car will emit a sound signal and the indicator on the key fob will flash occasionally.
4. Turn off the ignition.

Chinese clones perform quite well on the market. Pay attention to the Porsche clone - .

Starline (A6)

Disabling this alarm model differs in that it is unlocked using a special code. To enter it, you need to follow the following algorithm of actions:

1. Opening the car with a key;
2. Turning on the ignition;
3. Press the Valet button for at least 20 seconds. The first digit of the code indicates the number of presses;
4. Press the button again. The number of presses corresponds to the second digit of the code;
5. Turn off the ignition.

Tomahawk (RL950LE)

Two sound and light signals from the car will indicate that the alarm has been successfully disabled. Photo: aries-auto.ru

To completely disable the security system of this model, you should follow the following sequence of actions:

1. Opening the car with a key;
2. Turning on the ignition;
3. Press the service alarm button four times;
4. Turn off the ignition.

Sheriff

This signaling model is quite common. To unlock it, you must do the following:

1. Opening the car with a key;
2. Turning on the ignition;
3. Pressing the car alarm service button;
4. Turn off the ignition and turn it on again;
5. Press the Valet button again;

The above actions will help bring the alarm from a faulty state to repair mode, which will allow you to look for problems in its operation.

ALLIGATOR (D-810)

This alarm has two shutdown modes - standard and service, which is activated using a special code. To turn off the car alarm in standard mode, you must:

1. Use the key to open the car door;
2. Turn the key, turn on the warning lights on the instrument panel;
3. After 10 seconds, press the Valet button;
4. Turn off the ignition.

To enter the security system into service mode:

1. Open the doors with the key;
2. Insert the key and turn on the ignition;
3. Turn off all warning lights by turning the key to its original position;
4. After a few seconds, press the alarm service button. The number of presses is equal to the first digit of the code;
5. Turn the ignition on and off;
6. After waiting approximately 10 seconds, press the Valet button. The number of presses corresponds to the second digit of the code number;
7. Turn off and turn on the ignition.

If you enter an incorrect code more than three times in a row, the car alarm system will be temporarily unavailable.

Switching to the service mode of this alarm is quite complicated, unlike models from other manufacturers.

ALLIGATOR (LX-440)

To switch the model in question to service mode, you need to sequentially execute:

1. Opening the door with a key;
2. Use the ignition key to activate all warning lights on the dashboard;
3. Pressing the Valet button;
4. Turn off the ignition.

Emergency shutdown of car alarms from this manufacturer is carried out as follows:

1. Opening a car door with a key;
2. Turn the ignition key until the warning lights turn on for a while (up to 10 seconds) and turn it off;
3. With the ignition already on, you should hold the service alarm button for at least 10 seconds until the car emits a beep. It will mean that the alarm has entered maintenance mode.

If your alarm remote control has stopped working, pay attention to this video:

Unblocking car alarms

Now there is a huge selection on the car alarm market. Despite all this abundance, quite often these anti-theft devices fail. Therefore, at least once in their life, every car owner faces the problem of how to repair the alarm system, because, unfortunately, nothing lasts forever.

But don’t be upset, even if you have neither the desire nor the ability to deal with the problem on your own, there are many specialists in the city who will help solve any problem related to an alarm malfunction.

Very often, car alarms fail due to improper installation. Also, the alarm system may malfunction due to the car's electronics, a breakdown of the central locking system, or damage to the insulation on the wiring.

With the onset of severe frosts, it becomes necessary to unlock the car alarm. The reason is batteries that cannot withstand low temperatures and fail. And one of the protective systems of modern alarms is precisely when there is insufficient power. This makes it possible to prevent attackers from manipulating the car’s battery.

As paradoxical as it may sound, in addition to battery malfunction, the reasons may also be abnormal zones where the key fob signals are jammed. These are places located near large factories and factories, large metal objects, etc.

In all these cases, unlocking your car's car alarm can be done without much effort.

For example, a dead car battery simply needs to be recharged and the alarm system itself needs to be rebooted.

And when the key fob signal is jammed, you just need to bring it as close as possible to the central unit of the car alarm. Naturally, for this it is advisable to know where they were strengthened during installation.

What malfunctions occur most often?

What to do if the car alarm blocks the engine and you can’t unlock it yourself? Why does the device act up and not work as it should? What should I do if the system closes but does not open the doors?

First of all, you need to understand the reasons:

1. Nutrition. One of the most common reasons why the system does not open or close the car doors, locks the engine, making it impossible to start, is power. In this case, the system may not respond to pressing the key fob buttons, and the turn signals also do not turn on. Or the car alarm starts performing actions that you did not specify. Drivers often think that the signaling itself is malfunctioning or broken - first of all, it is necessary to diagnose the remote control, in particular the batteries. If you take the remote apart and change the battery, it only takes a few minutes. One of the signs that the battery is running low is that the light on the remote control begins to blink dimmer, and the device opens the car doors with a shorter range. Also, the reason why the remote control does not work can be due to liquid getting on the device.
2. The problem is in the wiring. If the alarm in the car does not work, the device blocks the engine and does not allow the unit to be unlocked and started, this may indicate a faulty wiring in the car. In this case, the car’s turn signals may also refuse to work. Moreover, problems with wiring can affect many motorists, regardless of whether the alarm system is installed expensive or cheap. As a result of exposure to external factors, contacts in connections will always oxidize. So, if the system locks and does not allow the car doors to be unlocked, do-it-yourself repairs always begin with checking the electrical circuit.
3. The computer needs to be rebooted. When the alarm in the car does not work, the diode lamp may burn brightly, but does not react in any way to pressing. If this is the case, then repairing the immobilizer system yourself begins with identifying the causes. The central unit may freeze, because it is a computer in any case, and if the immobilizer malfunctions and does not allow the engine to start, the first thing you should try is to restart the computer. You should try to disconnect the battery, that is, de-energize the system for a few minutes, and then reconnect the battery. If after this the car’s turn signals begin to blink, which is possible, then the problem was precisely the need to reboot.
4. Fuse malfunctions. The reason is that the fuse has blown. In the event that the system is blocked and does not allow the engine to start, the car’s turn signals do not work, the immobilizer is faulty, it is quite reasonable to think that the alarm system in the car is broken. But sometimes problems with alarms can be caused by failed fuses. When diagnosing elements, it would be advisable to check the fuses and turn signals, that is, the light alarm. Sometimes turn signals may not work due to a failed relay or fuse. If everything is in order with the turn signals in the car and with the fuses too, then you can try to ring the wiring on the negative side, but this method is relevant if you know where the signaling unit is installed.
5. Errors in or shock sensor. It often happens that when a car body hits a door, the system does not work. This does not mean that the immobilizer is faulty, but indicates that the shock sensor is incorrectly configured or the system is not installed correctly in principle. It may be that the sensor is installed incorrectly. In such cases, it makes sense to configure the regulator yourself.
6. Immobilizer sensitivity. It may happen that the system has blocked the car doors, but the siren turns on frequently and without reason. In this case, the reason, again, may be the need to adjust the shock sensor, in particular, it will be necessary to reduce its sensitivity. If the sensitivity is too high, the system may turn on randomly even from the wind.
7. Loss of signal between the key fob and the electromagnetic drive of the device. The remote control of the car's anti-theft system works in normal mode, but the alarm does not allow opening the doors and starting the engine. If this is the case and you cannot open the doors and start the engine, then the cause of the problem may be the loss of the signal between the key fob and the electromagnetic drive of the device. If the electrical circuit is intact, and when you apply current to the drive, it starts and operates, then you need to conduct a thorough diagnosis of the central unit of the system. Perhaps it is the unit that supplies the wrong impulse to start the system and lock the car doors.
8. Broken wiring. It often happens that the car doors close, the engine starts and immobilizer repair is not required, but the anti-theft system does not work correctly. In particular, it arms the vehicle, but when you try to open the car, the siren will not work. There is a possibility that no current is passing through the siren unit; it is quite possible that the problem is a break and you need to identify and eliminate it. Identifying the cause of a wiring break on your own can sometimes be problematic, especially if you have never encountered such a problem. If you have no experience, it is better to trust a qualified electrician who can do everything correctly (the author of the video is Anton Baitov).