Alarm light. Why is the alarm light constantly on? Self-Troubleshooting Alarm

Now it is difficult to find a car without an alarm. Some get the security system at the factory, some later - at the service station. But there are situations when everything worked yesterday, but today the alarm light is constantly on or blinking. What to do, and is it necessary to do something in such cases?

Causes

What does such a light bulb mean? Often this is a signal to the driver (or owner) that something is wrong with the system... Let's analyze the most common cases why the alarm light is constantly on. There can be many reasons, but there are only three main ones:

• accidental pressing of buttons on the key fob;
• there is no contact on the end switches of doors or hood / trunk lids;
• the system as a whole or individual sensors does not work.

If for the latter case the recipe is universal - a service center, then the first two can often be solved by ourselves.

Important! If the lights are on, the security system is partially working or does not work at all.

We'll talk about limit switches below, because in almost all cases, the reason is the same, and it is solved according to one recipe... In addition to the fact that the alarm lamp is constantly on, this can be understood by other signs. Now let's look at the first point - accidentally pressing the buttons on the key fob.

If the owner carries the keychain in his pocket, then a random movement can press a sequential combination that includes the so-called service mode. While the mode is working, a blue alarm lamp on the owner's call sensor is on. The mode is intended for servicing both the signaling components and the entire machine as a whole, and is turned on by the masters at the station.

In this mode, locks work, and that's all. This mode is sometimes referred to in the documentation as "valet" or "valent".

Attention! In this mode, the alarm is disabled (does not work).

Nevertheless, practice shows that the mode can be turned on by accident.

Blinking of a light bulb in popular models of alarms

Sherkhan

So, we have a light on the Sherkhan alarm constantly on. How to check if the service mode is enabled, and if this is it, disable it? Note that not only in Sherkhan, but in most systems, the key combination is written on the back of the key fob. Also, the owner should remember that the service mode indicator is blue. In other words, if a blue light is on on the Sherkhan alarm, the first thing you need to pay attention to is the accidental activation of the service mode. Sometimes, in the case of a key fob with an LCD display, a symbol resembling one or more Latin "Z" may be displayed on it.

To disable (or enable) maintenance mode, the owner must press simultaneously buttons "1" and "3" holding them for one second.

Attention! Holding it for two seconds will disable the shock sensor, which will not be indicated in the service mode.

If everything is pressed correctly, then the light goes out. Sometimes, depending on the modification of the security system, the car may respond with sound signals or flashing headlights.

Sherkhan can illuminate almost every event with light bulbs. Sometimes the light will not be blue, but red. A red light anywhere needs attention. If a red light is constantly on on the Sherkhan 5 alarm, you definitely need to pay attention to this. The security system indicates the presence of one of two problems:

• the battery is discharged below the normal winding mark. Most often, it is no longer possible to leave in such a car;
• the car needs a visit to the service center because the malfunctions are of an extraordinary order.

We will not dwell on these options in detail. If the car starts up - you need a center, if it doesn't start - you need a new battery. However, Sherkhan 5 is just an example. Everything described is also suitable for other models of this system. In any case, if the Sherkhan alarm light is on, it means that something needs adjustment.

Starline

If your car has a Starline system, then all of the above, in principle, is suitable in this case, with the exception of one trifle. In the latest models of the Starline alarm system, the light blinks, and does not light up constantly, like Sherkhan's.

Disabling Valet will also look different.

Attention! Enabling the mode allows you to open the car, the rest of the security functions are deactivated.

And if in normal mode we turn off the alarm, then open the car, then under normal conditions nothing will blink. However, when the Starline service alarm mode is turned on “car open”, the light will continue to blink. Again, this is not a problem. You can use the car, move around the city, but the blinking alarm lamp while driving will remind you that the security functions are deactivated at the moment.

To turn off the valet in the Starline alarm, just press the "2" button once(in the figure, the middle button on top). In this case, the light should go out, and the “VALET” mark will disappear on the key fob display.

Tomahawk

The developers of the Tomahawk system took a slightly different path. Unlike Sherkhan, who gives a lot of information with different bulbs - in the Tomahawk alarm, only one is lit when both the service mode and the "passive immobilizer" function are turned on. At the same time, the difference between the modes is visible when “disarming the car”. The immobilizer will extinguish the light on repeated removal, the service mode will not. Removal from the service mode is done by several pressing of the "z" button on the key fob. This is implemented differently in different versions, so you need to look at the instructions. Usually once with retention and once briefly.

Pandora

The red light, as mentioned above, is a reason to pay attention. If the red light on the Pandora alarm is on, the connection with the key fob may be lost. At the same time, the loss is not permanent, sometimes everything works normally. Here it is worth paying attention to the fact that, according to the specification, this security system checks the connection only in the armed mode. There are no checks at other times. Often, either the key fob battery or the contacts in it can be to blame for this. If replacing and checking the contacts does not help, only to the service center.

End fittings

Before writing about limit switches (limit switches), it is necessary to separately mention the feature of the Starline security system. At a good driving speed, in some cars the air flow running on the hood can slightly raise it. But the Starline bonnet contacts are located so that the warning light will be on when driving, indicating that the bonnet is not closed.

You can also note the limit switch on the trunk of cars in which the Sherkhan system is installed. While the trunk is not tightly closed (for example, due to non-standard cargo), a blue light will be constantly on on the Sherkhan alarm.

This is what a limit switch might look like.

If the owner has checked the functions of the "immobilizer" and is sure that the service mode is not turned on, it is necessary to check the limit switches of all doors, not just the hood. If the contact is oxidized, dirty, or the cover presses on it with insufficient force, this is the second reason why the light on the alarm is on. Checking and cleaning - usually fixes the problem, after which the light goes out.

The light does not blink

Finally, let's analyze a special case when everything worked before, but now the alarm light has stopped blinking. As in other cases, there are several solutions:

• at the service station something was too clever;
• the signaling works, it just does not blink.

In both cases, the problem can be finally solved only at the service station.... Just note that the owner knows the answer to the first option. The second case can be diagnosed at home, before going to the service station. If the light just went out, the alarm in this case is working normally. Switch on as usual, and then check. If the security system senses an alarm, the owner will immediately understand it. If nothing happens, decide only through the station. For simplicity of the test, some sources recommend trying while sitting in the car.

Advice! It is still worth contacting the service station. Alarm light - health indicator.

Sometimes the light goes out in another case. A reaction that can only manifest itself over time, and only at the driver's door. Here it's not about the limit switch, as it was written above. You need to check the contacts in the lock activator. It is easy to diagnose - from time to time the lock sticks (does not freeze).

A constantly burning light bulb has been mentioned several times in this article.

In conclusion, it should be noted that the security system today includes a number of parameters, and the question of what to do if the alarm light is on constantly should not arise for the current owner. First you need to diagnose yourself (in particular, the service mode), and do not postpone with a visit to the service center. Of course, the on-board computer often helps in diagnostics, but there is something that it simply does not understand what is normal and what is a problem.

In this material, we will consider the question of many car owners concerning, namely, why is the alarm light constantly on? But, as expected, we cannot do without a short preface.

The alarm light is constantly on - a problem that motorists often face

The evolution of the auto industry never stands still. Comfort, safety, reliability, power, quality of control and so on increase. Undoubtedly, along with the growth of the development of the automotive industry, prices for cars also rise. The car protection system does not lag behind the general development. If earlier the only thing that protected your car from intruders was a lock that opened with a simple key, now whole complexes of electronic security systems, popularly referred to simply as alarms, have come into play. Such systems provide not only highly effective protection, but also improve the comfortable use of your "iron friend", for example, such functions as: remote control of door locks, hood lids, luggage compartment lids, as well as provide the ability to remotely control power windows and start the engine.

Nowadays, it is quite difficult to find a car without an installed one, except perhaps an old Moskvich, who has been gathering dust in the garage of an equally young grandfather for a long time. And more modern models are already initially equipped with standard electronic protection devices from the automaker. However, electronic security systems have an unpleasant tendency to break down, "glitch" and give other failures, which make negative changes in our daily routine.

Most car owners determine the state of their "signaling" by the LED lamp, which is made in order to display the current status of the protection system with various light signals. However, not everyone has an idea of ​​which light signal means this or that alarm state. Most are guided by what signs the LED has given from the moment it was installed in the car, mainly this is a measured blinking. And as soon as this very blinking turns into something else, then every car owner certainly considers it his duty to dig into the protection system and find out what is actually the matter. On the one hand, this is correct, because no one wants to leave their car in the care of an "inadequate" one. On the other hand, if you are not a car thief and not an employee of a service station, then it will be quite difficult to understand such complex devices, and is fraught with the final breakdown of the security system. And the most, perhaps, the most frequent question, which is usually followed by picking "signaling", is - why is the alarm lamp constantly on? To this we will try to answer you further.

Reasons why the LED is constantly on

There are several reasons why the alarm light is constantly on:

• The most common reason is that the Valet service mode is running.
• The second fairly common reason is the malfunction of the door limit switches, hood and trunk.
• Well, a less common reason why the alarm light is constantly on is a software failure in the operation of the security system itself, as well as the failure of one or more sensors.

After reviewing the list, let's look at all the points in more detail, and start with perhaps the most common reason, the occurrence of which is most likely.

Service mode "VALET"

The very designation "service" already indicates that this function is intended for service work both in the security system itself and in the car as a whole. In this mode, all security functions of the device are deactivated and do not react to anything. The entire functionality of the alarm in this state is reduced only to the possibility of remotely opening and closing the locks of doors, hood and trunk. At the same time, the LED lamp stops blinking and goes into constant operation mode, on some devices the lamp goes out when the engine is running.

The mode is activated on most devices from the remote control by pressing a certain combination of buttons. Thus, if you carry the remote control in your pocket, the buttons could accidentally be pressed in the desired combination, thereby activating the mode. Basically, such combinations consist of pressing and holding two or three buttons at the same time, less often there are complex combinations of successive pressing of the corresponding buttons.

There are systems that do not provide for the inclusion of such modes through a remote control. For such devices, a button is installed in the cabin, the so-called "Valet". Such a button in the cabin is a real happiness for car thieves, since it allows you to instantly turn off all car protection, including engine control. Therefore, having discovered such a button, an attacker can easily drive off in your car wherever he pleases.

How to find the "Valet" button

When installing an anti-theft device, each owner has the right to choose the location of such a button himself. A similar button is placed in the secluded corners of the car, and the better you hide it, the more chances that the hijacker will not find it. You can install it anywhere, even in the trunk or under the hood. But if for some reason you did not take such part in the installation of the alarm, then basically, by default, the button is located under the steering column, covering it with an inconspicuous plug.

If there is nothing under the steering column, in this case, we recommend that you look through the technical instructions for your alarm, namely the location and designation of the output sockets to which various sensors are connected, and our cherished button. When you find the right connector, just follow the wire leading from it, and in the end you will run into what you were looking for.

If the remote alarm has a display, then when Jack mode is on, the screen in most cases will display an icon in the form of the letter "Z". In order to deactivate the mode using the button in the passenger compartment, press and hold it for about ten to fifteen seconds, after which the car will emit several short beeps, accompanied by light signals of the side lights, and the LED lamp in the passenger compartment will go out.

However, this method of activating and deactivating the mode is not suitable for all devices, just as the key combination on the remote control is different for each manufacturer. Below we will provide a combination of the necessary buttons on the remote control of the most popular alarms. For more information on enabling and disabling the mode in systems that are not included in our list, refer to the instructions or contact the service center of the manufacturer of your security system.

Activation and deactivation of the "Valet" function in the Star Line Twage B6 alarm

To activate with the remote control, hold down key three until the remote emits one long and two short beeps. One of the icons will start blinking on the remote control screen. By short pressing the key three, set the blinking of the "VALET" icon. Press the one button, after which the car will notify you with a light signal of the side lights, and the remote control will emit two short and two long beeps. After that, the "VALET" icon will be permanently displayed on the remote control screen, and the LED lamp will switch to continuous operation.

Deactivation is performed by pressing key two, after which "VALET" will cease to be displayed on the remote control screen, and the alarm lamp in the passenger compartment will go out. Similar manipulations apply to the Star Line Twage B9 system.

Activation and deactivation of the Valet function and the Scher Khan Magicar 5 alarm

In order to activate the mode, simultaneously press and hold for no more than one second the keys "I" and "III". Be sure to observe the duration of holding the keys, since the same combination, when held for two seconds, deactivates the shock sensor.

To deactivate the Jack, repeat the combination of activation - "I" and "III" hold for no more than a second. If the shock sensor is accidentally deactivated, press the "I" and "III" keys for at least two seconds. Similar combinations are used in the Scher Khan Magicar 6 system.

Technical and software problems

Another common reason why the alarm light is constantly on are faulty limit switches, hood and luggage compartment. The end switch is a small button that is installed in the car door. The security system unit is connected to them, when the door is closed, the limit switch button is pressed, thereby closing the circuit. The alarm thus recognizes that the door is closed. Defective, oxidized contacts in the limit switch may not close the circuit, as a result of which the protection system may not understand the current situation, and will notify you about the allegedly unprotected place of the car by the constant operation of the LED light. Such problems can be eliminated on your own, you just need to disassemble all the limit switches, thoroughly clean the contacts, rinse in alcohol and lubricate with electrically conductive grease. Then you can reinstall the buttons to their original place.

Although in rare cases, the answer to the question of why the light bulb is constantly on can be various sensors that have failed, for example, sensors for shock, volume and position of the body. In such cases, it is better to seek help from a service center. Also, you should contact a specialized center for help if the alarm lamp is constantly on due to a software or hardware failure in the security system unit itself. If none of the check of the above reasons gave a positive result, then, most likely, a failure is in the signaling unit.

In conclusion, we wish that from now on you will never again be tormented by the question of why the alarm light is constantly on, as well as a restful sleep at night without worrying that someone will take your "iron friend" away.

Blocking the engine start is a function that is in the list of available options for almost any anti-theft complex. In this case, there is an immobilizer in the system, which recognizes the owner by a special tag and allows the engine to start. Ordinary car alarms, which have a similar function in their arsenal, can also block the start of the engine.

According to the assurances of specialists who work with automotive electrical equipment, more than half of all unexpected cases are directly related to car alarm malfunctions. Note that the complexity of the implementation of locks in this case is much simpler in comparison with complex anti-theft solutions. This significantly increases the chances of removing the engine start blocking on your own in the event of a breakdown or malfunction. Next, we will look at what to do for the driver if the alarm blocks the start of the engine.

Read in this article

Engine blocking with car alarm

In the presence of installed anti-theft systems, electrical equipment is responsible for blocking the start of the motor. Immobilizers or car alarms can be faulty and give constant or occasional failures during operation.

It should be added that the severity of the problem will depend not on a specific model or brand of car, but on the complexity of the installed protective anti-theft complex.

The main sign of problems with the alarm is that a working engine will not start or immediately stall after starting. The engine may not respond to starting from the key fob, and may not start with the key. This means that the system has made a partial or complete blocking.

Accidental activation of the engine blocking function

First of all, carefully study the displayed pictograms on the alarm key fob. A common reason for blocking is accidental activation of additional functions. It is also necessary to observe the indications of the LED indicator lamp (if any) in the passenger compartment, which serves as a light indicator of the alarm status. Blinking of the LED lamp in most cases indicates that the anti-theft function of the immobilizer is activated in the menu.

If, after turning the key in the lock and turning it on, there are frequent blinking of the warning lamp (for example, the StarLine car alarm) before starting the engine, and the key fob itself displays an icon with the inscription "immo":

1. one of the ways to solve the problem is to remove the key from the lock, after which it is enough to press the button for opening the central door lock on the key fob.
2. You can also leave the car, put the alarm on, then disarm and then start the engine.

In other words, you need to make sure that the alarm works in the normal and usual mode for the owner. Up to 30% of cases of blocking the engine start by an alarm occur due to an accidental change in software settings. The driver's task is to disable all unnecessary functions in the settings.

Using the StarLine signaling as an example, let us note that this system has an option for "two-stage" unlocking. The activation of the function can happen accidentally, a separate icon will light up on the key fob screen. To deactivate the key fob, you must hold down the 3 button. The key fob will emit two peaks, after which the 3 button is pressed once again. Then button 1 is pressed for a few seconds, then the security functions are removed;

Deactivation of locks using the service button in the passenger compartment

If there are no signs of unintentional activation of the engine start locks, you can try to unblock the engine using the service mode. This mode is called Valet and is used to transfer the system to the service mode. To activate, you need to insert the key into the ignition switch, turn on the ignition and then turn it off.

After that, you need to hold the button for turning on the service mode for about 10-20 seconds. The result will be a notification with a special short signal, after which the signal lamp (indicator light, LED) will be constantly on. This method means disabling all security functions, which can also mean removing locks from the engine. We add that after the problem is eliminated, it is necessary to activate the security alarm functions again.

In some cases, emergency deactivation of the alarm by means of a hidden button in the passenger compartment also helps. The specified button is also held for 10 to 20 seconds, after which the signaling LED of the alarm status lights up and then goes out. After the light has gone out, you can try to start the engine.

Self-Troubleshooting Alarm

• It is often possible to eliminate the malfunction and remove the engine blocking with your own hands if it is possible to detect blown fuses. This problem often leads to malfunctioning of the alarm. Fuses must be checked, if a problematic element is found, it is necessary to replace the blown fuse with a known good one.
• Alarm malfunctions can also be associated with insufficient charge or poorly secured terminals on the battery contacts. In this case, the battery is still capable of sluggishly cranking the starter, but the engine blocking can already work and further prevent the engine from starting.

When the battery is discharged, a protective function can be activated, which blocks the start of the engine as a result of a power outage or a voltage drop in the car's electrical circuit.

• Another step will be to check the limit switches (limit switches), which are located under the hood and trunk lids. The ingress of moisture or oxidation of the limit switch often causes an incorrect signal to the alarm control unit, which leads to the engine blocking. Please note that unprofessional installation of alarms and limit switches, as well as incorrectly carried out, can lead to malfunctions of electrical equipment.

If attempts to remove the engine blocking and start the engine were unsuccessful, then there is a high probability of a serious failure or failure of individual alarm elements. The result is an arbitrary operation of the engine locks, which cannot be disabled using standard methods. The defective machine must be taken to a service station, as the removal of the lock will require professional intervention.

The specified delivery can be carried out by a tow truck. Another available way is to call a car electrician who works at the exit. Note that the final costs of paying for the service of an exit engine unlocking, turning off the car alarm, emergency opening of locks, etc. often turn out to be less than the delivery of the car to the service center on a tow truck and payment for repairs at the technical center.

Read also

Why does the starter turn normally, but the engine does not pick up, does not start. The main causes of the malfunction, checking the fuel supply systems, ignition. Advice.

Alarm malfunction is one of the most common vehicle malfunctions. At the first manifestations of abnormal operation of the car alarm, measures should be taken to identify the causes of failures, and begin to eliminate them.

Otherwise, a situation is possible when the anti-theft system will deny access to the passenger compartment or prevent the engine from starting. Consider the main symptoms of a car alarm malfunction, the reasons and how to fix them.

Why the alarm light on the windshield is not on

In this situation, there are three possible options for the security system:

1. The alarm works in normal mode, except for only the light indication of the control LED

Most likely, the connection of the main alarm unit with the control LED is broken. Usually, the connection of the indicator LED to the head unit is organized by a two-wire conductor through the chip.

It can be damaged by mechanical stress. The wire is usually routed from the lower zone of the front driver's pillar (there is usually an alarm) up to the windshield, the driver can touch it with his foot. The connector contact may also loosen or corrode, in which case it should be tightened.

If such actions do not help, you can ring the LED with a multimeter. It rings like a regular diode: in one of the directions, the resistance is equal to infinity, in the reverse connection of the probes, the resistance will be about 600 ohms. If the LED is defective, it must be replaced with any low power LED of the appropriate color.

2. The alarm does not respond to key fob signals when arming

For example, the LED on the key fob blinks, the display key fob is operating normally, but the car is not locked.

The probable reason is the absence of one of the supply voltages for the alarm or a reliable connection to the body. It should be checked serving the central alarm unit. They are usually found in the steering column space on abnormal conductors or sockets.

You should also check with a multimeter the presence of the supply voltage "+12 Volt" on the fuses, the quality of the connection of the blocking alarm relays. If these actions are unsuccessful, using the Valet button, you should try to reset the alarm to its original (factory) state. To do this, you must follow the instructions supplied with the security system kit.

3. The alarm does not respond to key fob signals when disarming

The LED on the key fob blinks, the display key fob works normally, but the car remains locked.

First of all, you need to open the car with a mechanical key. Then, using the Valet button, remove the car from the alarm, then bring the car alarm to the factory settings. Next, you need to try the methods listed in the previous paragraph.

What to do if the alarm indicator is constantly on

There are three situations of such work of car alarms:

1. The car is locked and does not respond to signals from the working key fob

If the car is closed, use the key to open it and deactivate the alarm using the Valet button. Most often, a constant glow of the diode indicates a software failure of the security system.

Modern security systems are a complex microprocessor controlled complex. They can freeze like a computer. You can try to restore factory settings using the Valet button. Sometimes it helps to disconnect the alarm from the power supply by removing the fuses serving it. It is safer to disconnect one of the terminals of the storage battery for 15 - 20 minutes.

The Valet button is usually located near the driver's left knee or in a hidden place no further than 50 centimeters from this zone.

A typical way to deactivate the alarm using a secret button: turn on-off-turn on the ignition, then briefly press the button one (sometimes three, five) times. If the car reacts to it, pressing will be accompanied by a sound or light signal.

2. The car is not locked, does not respond to signals from the working key fob

The sequence of actions is approximately the same as in the previous paragraph. If there is a spare or additional key fob, you can try its interaction with the alarm.

If the alarm does not respond to the Valet button, most likely one of the voltages supplying it is missing, or the main alarm unit is faulty. It is possible to check the serviceability of a block only by temporarily installing a known working block of the same model. It can be temporarily borrowed (not free, most likely) from a workshop that installs alarms from this manufacturer.

3. The car is not locked, the alarm works normally

The probable reason is the breakdown of the control transistor in the head unit of the car alarm.

If it is built into a microcircuit, then such a repair is carried out by replacing the microcircuit, but this cannot always be implemented in practice.

Another possible cause is a short in the wiring leading to the LED.

If the light on the alarm key fob

Lights up constantly

Possible situations:

The reason for the constant glow of the diode can be a breakdown of the control transistor in the keychain. It is located separately on the board or built into the control chip. In the second case, it is cheaper to change the key fob or the entire board. If the transistor is faulty, it can be re-soldered to a serviceable one. Such repairs require appropriate qualifications.

The probable cause is a software or technical failure of the key fob.

The first step in such a situation is to try to temporarily (for 15-20 minutes) get the keychain battery. Just in case, you need to check the value of the residual voltage on the battery. If it is less than the nominal value by 20 percent, it should be replaced.

At the moment of re-installation of the battery, the microcontroller of the key fob is rebooted, after which it can return to working condition. If a similar situation repeats again for a short time (a month), the key fob should be replaced, after which it must be "registered".

Does not burn

Possible situations:

1. The car alarm works normally

Most likely, the cause of such a malfunction is the failure of the LED or corrosion of the place of its soldering. It is necessary to disassemble the key fob, ring the LED and the additional resistor with a multimeter.

If the LED is working properly, it is necessary to solder the place where the diode is installed into the board. Sometimes corrosion (cold soldering) is not visible even under a magnifying glass.

2. The alarm does not respond to key fob signals

Typical malfunction. The most probable reasons are battery discharge or key fob malfunction.

Some car owners confine themselves to dismantling the battery from the remote control and checking the residual voltage with a multimeter. After making sure that it corresponds to the nominal value, they decide to replace the key fob. This is not entirely correct. Under load, a heavily discharged battery may not provide the current required for normal operation of the key fob circuit. Therefore, it is safer to replace the battery.

In the case when the key fob inadvertently fell into a puddle, another water environment, was stored in damp conditions, it is possible that mold, corrosion has formed on its board, which leads to large leakage currents, inter-track short circuits. The battery in such a situation can be discharged within a week. It is necessary to disassemble the keychain and clean its board with alcohol. Do not use other solvents.

The operating modes of the car alarm are controlled by the alarm indicator lamp. The alarm status is monitored without using a key fob with an LCD screen. From what mode the security device is in, the alarm lamp is on, blinking or at rest (off). The article provides a brief analysis of LED indicators for several types of alarms.

Alarm light options

Each developer of car alarms puts a certain state of the LED into the algorithm of functioning. Under different conditions, it burns, blinks, there is an alternation of flashes or is in an extinct state.

Below is a table of the states of the light bulb (on continuously, blinking, at rest) placed on the machine.

The car alarm PANDORA (more about) uses a three-color light bulb. The car alarm indicator on the car is on or blinking, we suggest that you familiarize yourself with the table below.

The LED can blink from 1 to 3 times per second or does not light up at all.

Different states of the alarm lamp

Today, vehicles without car alarms are some of the classics of the distant Soviet period. Security systems are installed at service stations, supplied with cars from manufacturers. Like all technical means, they are prone to breakdowns and failures. A failure is signaled by a light bulb, it is on all the time, blinks without stopping or has gone out completely. Let's analyze the most common situations.

Causes of constant burning of a light bulb

A constantly lit light bulb signals that something is wrong with the car alarm. The reasons can be very different, among the main why it burns are considered:

Accidental activation of the "VALET" mode. In normal modes, it is activated in car alarms by combinations of key fob buttons. Inadvertently pressed activation buttons cause the LED to glow continuously, which causes unpredictability of the driver's actions, when the light does not blink, but is on all the time. If the service alarm mode is accidentally activated, the security options are deactivated. There is an option that remotely controls the opening and closing of locks of doors, hood, trunk of the car. Bringing to a working condition is carried out according to the operating instructions for the car alarm.

Breakdowns of a technical nature. In cases where the lamp should blink, and it is on, the malfunction should be sought in the technical component of the alarm. One of the reasons is problems with limit switches. The essence of the problem often lies in oxidation, burnout of the limit switch contacts. As a result, the car alarm circuit does not close, the LED is constantly on, the car is unprotected. The problem is eliminated by cleaning the contacts, replacing the switches. Another problem, when the car alarm lamp does not blink, but is on, arises when the device's sensors fail. The problem is properly solved in service centers.

Failure in software or hardware. If the LED on the car remains on after checking the above reasons, there is a problem in the main car alarm unit. An accurate diagnosis will be made by the specialists of the service center, followed by troubleshooting.

Causes of frequent flashing of the alarm lamp

A common problem with signaling vehicles is the frequent blinking of the indicator light, followed by blocking the start of the engine. One of the reasons is the improper operation of the limit switches, the closing parts of the car. It is enough to fail one of them and a failure occurs in the correct operation of the device. It is enough to clean the contacts or replace the switches.

Another reason is the incorrect location of the powertrain temperature control sensor. The car alarm LED will start working in normal mode if the sensor is reset according to the instruction manual.

The alarm light has stopped burning - reasons

In the practice of motorists, situations occur when the alarm LED does not light up and does not blink at all. Experience shows that the main reasons can be as follows:

• The main unit is overheating;
• Installation errors, with power off, the alarm returns to the factory settings;
• Contacts, wiring, fuses burn out.

Diagnostics of specialists will help to accurately determine the problems in the security system on the car. For a car owner ignorant of the nuances of electronics, it is difficult to identify the reason why the LED is off. Service centers that have devices and tools will perform the alarm recovery with the highest quality, so that the light bulb meets its purpose: when necessary, it blinks; when necessary - it burns.

So, this article discusses the main reasons for what problems there may be in car alarms, determined by the state of the light bulb. It burns incessantly; blinks out of place; does not light up.

As a result, it was revealed that the alarm malfunctions are associated with the operating state of the limit switches. Sometimes sensors are the cause of the wrong behavior of the car alarm LED. There are problems with the main processor unit: hardware failure; incorrect software operation.

Timely diagnostics and troubleshooting will save the car from intruders and theft.