Causes of malfunctions of the alarm key fob of different models and their elimination. Why the alarm may not respond to the key fob and how to fix it The main alarm key fob does not work

13.05.2020

If the Starline alarm does not respond to the key fob, this greatly complicates the process of controlling the anti-theft complex. Malfunctions in the operation of the communicator may be associated with a software or hardware component.

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Causes of alarm failure and their elimination

First, let's analyze why the car alarm Starline A61, A91, A93 and other models with feedback do not work and what to do in such cases.

Dead battery in alarm key fob

If the primary or secondary communicator stops working, the problem may be due to the low battery inside. If the pager of the system is equipped with a display or a diode indicator, then the battery discharge can be determined by the brightness with which the light blinks. On the screen modern models systems have a special icon that appears when the power source is discharged. To solve the problem, the battery is replaced with a new one.

In order not to encounter such a problem during the trip, we recommend that you carry spare batteries in the car. If you don't have a spare battery, you can remove the old battery from the case and tap it on a hard surface. Alternatively, you can try rubbing it with your hands. If there is a residual charge in the battery, these actions will slightly restore the functionality of the communicator.

Symptoms that will allow you to determine the discharge:

the car owner needs to press the buttons harder when sending commands;
communicator keys work every other time;
the diode bulb on the pager case became dimmer;
The low battery indicator appeared on the display of the communicator.

The GO FASTRELIABLE channel spoke about the independent procedure for replacing the battery in the Starline communicator.

The car has entered the radio interference zone

If a car with a Starline A61, A91 or other model signaling installed does not accept communicator commands, the reason may be interference. When the vehicle enters the radio interference zone, the transmission of packet data between the key fob and the microprocessor module will be difficult. Most often, interference appears near factories and enterprises, airports and sensitive facilities. The reason for the appearance of radio interference can be other cars equipped with powerful anti-theft systems. In particular, we are talking about places of accumulation of such cars, for example, in parking lots near supermarkets and shopping centers.

To solve the problem, it is necessary to minimize the distance between the communicator and the signal transceiver. If you bring the pager as close as possible to the antenna module, the alarm should respond to the command. If such manipulations did not help, then the only option would be to tow the car to another place where there is no interference.

Not enough voltage to trigger the system

If the car battery is discharged and its charge has dropped to a critical level, the voltage parameter will not be enough to execute the signaling commands. Such a problem may be due to the failure of the battery itself. Often, consumers encounter a similar malfunction during the cold season - when low temperatures The battery drains faster.

To determine why the on-board network of a car is low voltage, it is necessary to test the operation of the battery and the generator device.

Deterioration of the alarm system

The reason why the key fob does not see the signaling is often associated with the wear of the structural elements of the complex. As a result of prolonged use, the operating range of the system is reduced. The cause should be sought in the transceiver installed in the passenger compartment on the windshield. If the antenna module was initially installed incorrectly, its radius will decrease faster. Near the transceiver in the cabin, at a distance of 5 cm, there should be no metal products and electronic devices, their presence leads to interference.

The key fob does not sync with the car

A problem in pager synchronization can be understood by a properly functioning system and communicator. Typically, this problem occurs as a result of malfunctions in the software installed on the remote control. To turn off the alarm, you have to open door locks car key. The siren is then deactivated by entering the emergency stop mode. To solve the problem, it is necessary to perform the procedure for deleting the pager from the memory of the microprocessor unit and re-register the device.

To reset and link a new device, do the following (for example, model A91):

Turn the ignition key to the off position. Find the Jack service key, click on it seven times.
Turn the key in the lock to the ACC position to activate the ignition. The siren of the system will play seven beeps, which indicates that new communicators have entered the binding mode. Please note that when programming new pagers, information about old devices will be automatically deleted from the memory of the microprocessor unit.
Find buttons numbered 2 and 3 on the communicator body (other models may use keys 1 and 2). Hold them until the siren speaker plays one signal. The first communicator has been successfully programmed into the signaling memory.
The previous paragraph is repeated for all programmable communicators. If multiple pagers are bound, the interval between recording each subsequent device should be no more than five seconds. After programming the communicator, the siren will chirp.
Perform ignition deactivation. Exiting the binding mode will be signaled by five flashes of light devices.

If the binding did not help, flashing the device can solve the problem. If the signaling kit comes with a disk with a program, then you can program the communicator yourself. In its absence, seek help from specialists.

The Autoaudiocenter channel spoke about the self-binding of the Starline communicator.

Control unit problems

The microprocessor module is the brain of the anti-theft complex. Therefore, malfunctions associated with the control unit are considered one of the most serious problems. It is not always possible to eliminate them on your own. It is necessary to open the device and check its board. If traces of dirt or moisture are visible on it, they must be removed with a brush or cotton swab. AT modern complexes this problem rarely occurs. Depending on the problem, you can try to solve the problem by flashing the microprocessor module.

Symptoms that indicate a device malfunction:

The functions of the anti-theft complex do not work correctly. They can work or turn off on their own.
The microprocessor module responds to commands sent by the communicator with a delay.
The alarm siren is activated for no reason.

What should I do if the alarm does not see the key fob after replacing the battery?

If replacing the battery did not solve the problem and the Starline alarm does not respond to the key fob, you will have to repair it:

Open the back cover of the device and remove the battery from it. Depending on the model, dismantling can be done by snapping off the back cover or by removing it after unscrewing the bolt.
Disassemble the case of the device, evaluate its condition. Visually inspect it for board damage and cracks. If there are microcracks on the case, moisture will get inside the communicator through them, which will lead to its breakage.
If there is dirt or dust inside the device, use a soft brush to clean the inside of your device. For the purpose of removal of pollution use of alcohol solutions or solvents is not allowed. Processing the board with such liquids will destroy the capacitor devices.
Assess the condition of the contact elements on the board. If you can see that they are damaged, they must be re-soldered, this will require a soldering iron with a thin tip. Pay attention to the diagnostics of the buttons - their contact elements during long-term operation of the signaling fail more often than others. The buttons have special springs. If they are worn out, you need to purchase new keys and solder them to the board.
If you have a multimeter, then use this tester to diagnose the voltage parameter on the conductors. Check the operation of the LED bulb.

The repair procedure for the Starline communicator at home is shown by the Blue Box Ufa channel.

What to do if the car is not removed from the alarm?

There are two options for disabling the anti-theft complex if the key fob malfunctions - with or without a special password, to implement both options, you need to access.

If you have problems finding the service key, contact the installers, usually the button is located in the following places:

under the steering wheel in the car;
behind or under the glove compartment;
behind the ashtray under the car radio;
in free space in the central tunnel;
under the control panel;
in a block with safety devices, if it is located in the passenger compartment of the car;
next to the driver's pedals.

Insert the key into the lock and turn it to the ACC position.

Find the Jack service key and click on it several times. The number of clicks varies depending on the signaling model, but usually it is three or four clicks. After activating the ignition, you must have time to press the keys for twenty seconds.

Switch off the ignition. The siren should turn off.

Deactivating the alarm with a code

If the Starline A6 signaling is installed in your car, then when the key fob is not working, it can be turned off only by knowing the password. If you do not have a code, then the only option to solve the problem is to contact specialists. Initially, the anti-theft system is assigned a password of 11.

Turning off the signaling siren using the code:

Open the car door with the key.
Install it in the ignition lock and turn it to the ACC position.
Within twenty seconds after that, click on the Jack key several times. The number of clicks corresponds to the first digit of the password. If it is 4, then the button is clicked four times.
The key in the lock is turned to the Off position, and then back to ACC.
The second digit of the password is entered in the same way. If it is 2, then the service key is clicked twice.
The ignition is switched off.

To avoid break-ins, thefts and thefts of the car, as well as its contents, car owners massively install alarms on cars. This is the most common security tool.

The alarm can be standard, provided from the factory in the vehicle configuration, or installed separately. But they are all controlled remotely using a special remote control.

We are talking about electronic system, which periodically may fail, work incorrectly or fail. And often the failure occurs unexpectedly and at the most inopportune moment.

A fairly common situation is when the protection system stops responding to commands given through the control panel. It is important to quickly understand the causes and take appropriate measures to eliminate the problem.

Reasons for not responding

First of all, you need to understand why exactly when you press the buttons on the key fob, the alarm installed on the vehicle does not react in any way, does not execute commands.

Even the most experienced car alarm repairmen will not be able to tell at a glance why this is happening. Here you should study possible reasons. Sometimes by elimination.

But since this malfunction is widespread, there are several most likely problems. It is with them that you need to start. The probability of encountering some other reason, in addition to those listed, is minimal. Almost all possible mistakes and problems are taken into account. Having found a specific cause, it will be possible to focus on its elimination.

The lack of alarm response to commands from the control panel is usually associated with:

battery;
batteries in the remote control;
keychain damage;
radio interference;
loss of communication between the vehicle and the remote control;
electronic malfunctions.

Having studied these potential malfunctions, as well as determining their characteristic features, even the car owner himself will be able to accurately diagnose his vehicle and begin troubleshooting work.

Battery

One of the most common reasons why cars do not open with an alarm key fob is considered to be a corny dead battery in a vehicle.

When the battery is completely discharged or is at the limit of performance due to the minimum charge, the protective system may not respond to manipulations with the control panel.

Here it is worth trying to get closer to the vehicle, and again press the desired button. In some cases this helps. Although it is hardly worth counting on the ability to start the engine if the battery is dead.

The cause of such a malfunction is often the inattentive driver himself. Someone does not turn off the headlights when leaving the car, others leave the audio system and other battery-powered components on when the generator is not working. Sometimes a few hours is enough for the battery to completely use up its charge.

Correcting the situation is not difficult. Need to try . Various methods are used. But it is best to use charger with the required characteristics. If you are in conditional field conditions, then the method of lighting from another machine will help. The car will start, the alternator will charge the battery, and everything will start working normally again.

But with frequent battery discharge, you need to check the causes. Sometimes damaged wires, oxidized terminals are to blame. But the life of the battery itself may come to an end. The only solution here is to buy a new battery.

Batteries in keychain

If we take into account the statistics of calls to car services, as well as the reviews of the car owners themselves, then the most popular reason lies precisely in the dead batteries used to power the alarm control panel.

In a situation where the alarm remote does not open any doors and does not execute commands sent by pressing the corresponding buttons, take a close look at the device itself.

Many modern security systems are equipped with a key fob equipped with a display. If it goes out and does not light up when you press the buttons, then the problem is definitely in the batteries.

But there are other key fobs where the screen is missing. In this situation, look for a small diode on the case. Often, alarm manufacturers install a small LED that signals the driver when the batteries are low.

If such a problem is found, the only and logical solution is to replace the batteries. But they are not always available. Alternatively, you can try to remove them from the body, apply a few blows from each other or a hard surface. The batteries are then replaced and an attempt is made to activate the system again.

When this folk method does not help, go to the nearest store to purchase the necessary batteries. The replacement procedure obviously should not cause any difficulties. The problem is solved in just a few minutes.

Remote control damage

It is impossible to exclude the possibility of damage to the remote control itself, due to which the car doors do not open from the alarm key fob.

The device can get similar defects in a pocket, if it accidentally falls on a hard surface, and also due to mechanical influences. There are a lot of ways to damage the remote control.

Less commonly, motorists are faced with a situation where the button sticks or breaks. This is also related to mechanical damage, excessive force when pressing and inaccurate handling of the device.

You can get out of this situation by using a spare remote control, if available. Often, manufacturers of car alarms complete sets with two key fobs at once. Also, when equipping a car with a security system from the factory, the set comes with a main and a spare key with alarm control buttons already built into their body.

If there is no spare key, it is better to contact the company or store where it was purchased and installed security system. If the alarm was included, then call official dealer. They should provide you with another keychain. Depending on the availability of the warranty and its conditions, a new remote control will be issued free of charge or subject to an additional payment.

Radio interference zone

This is not the most common, but still occurring reason why alarms may not respond to the key fob. There are certain areas in which it will be problematic to transmit a radio signal from the key fob to the car. Various environmental causes can jam the signal.

If the motorist is in one of these zones, it will be somewhat difficult to send an alarm command on the car through the remote control. This will not work immediately if the radio interference is strong. But you can still get out of the situation.

To begin with, we will determine why these radio interferences occur, where they can be encountered. Airports are the most striking example. Here, the blocking of radio waves is carried out specifically so as not to disrupt the performance of navigation equipment, fine electronics from flight control points in the aircraft themselves.

Also, the areas where radio signals are jammed are important government facilities, large industrial enterprises, military bases and factories.

Once near such points, do not be surprised that the alarm does not turn on and off, or the car does not respond to other commands from the control panel.

You can check whether or not there are working radio waves using your phone. Look at the screen in the area of the cellular indicator. If it is not there, the signals here will not pass well. You can also check the operation of the GPS system in the phone.

Tomahawk alarm key fob

Now regarding what the driver needs to do when the alarm on his car stubbornly does not turn off. There is nothing particularly complicated here. But a lot depends on how much the radio signal is jammed at a particular location of the car.

The principle of turning off and on the remote control will not work here when it comes to existing radio interference. It's not the remote control or the batteries. The signal simply cannot be transmitted. Especially from a fairly long distance, as drivers are used to doing, being in zones without radio interference.

Remove the car from the alarm, or activate the security system through the remote, everything is real. To do this, try to get as close to the car as possible. It is good to know the exact location of the signal receiver from the control panel. Making money in this zone near the car, there is a high probability that the signal will be sent and the key fob will perform its functions.

If you are in areas where radio interference may be present, do not move far from the car before pressing the key fob button. Otherwise, the security system will not be activated in the car, and the car will become easy prey for car thieves. They quite often trade on, relying on the fact that radio interference will not allow the car to be closed. Better activate the guard at close range, make sure it works, and only then go about your business.

This recommendation does not only apply to areas with potential radio interference. Try to always turn on the alarm while near the car. This will make sure that the key fob has worked and the car is armed.

Communication loss

There is another reason why the alarm installed on the car may not respond to your key fob. It concerns the loss of communication that connects the signaling and the control panel.

This is due to a software glitch. From this, the transmitter or control device, that is, the key fob, cannot communicate with the receiver, which is the control unit in the car itself.

The situation is not simple, since its solution will require reprogramming the dysfunctional and broken communication. Here you have to use the emergency mode to turn off the control unit. Just remove the wires from the block. And then there is a new synchronization.

However, it is not necessary to contact service center or go to the office of a company that sold or installed a security system on a vehicle. The possibility of reprogramming is with the car owner himself. To do this, use the instruction manual for your alarm model. It tells you what to do and how to do it. If the guard is disarmed and the alarm works normally again, you can continue to operate.

Although after self-flashing, the protection may still not be removed from the alarm. Then the car is sent to the service center. Here, specialists will already deal with the car and will be able to accurately diagnose why the protection is not removed or the security mode is not turned on when you press the buttons on the remote control fob.

But there is one exception when you still have to go to a service center. In rare cases, the loss of communication between the control unit and the receiver in the car is accompanied by the loss of the software stored in the system memory. Self-synchronization will not help here. The only way out of this situation is to visit the service center. Here, specialists will restore the firmware, which will restore the functionality of the alarm controlled via the remote control.

Vehicle electronics

Before understanding possible alarm malfunctions, you should make sure that there are no problems in the car itself.

If there are malfunctions in the car's wiring, as well as other problems associated with electronics, the security system itself may not respond to the alarm key fob. If the central main lock does not work for you, or individual locks, you should check the status of the central lock.

Electronics problems most often occur after a short circuit. It occurs due to damage to the wires, exposed contacts and during sudden power surges.

It is impossible to exclude a malfunction of the control unit of your alarm, which provokes the failure of the wiring. These problems usually appear with characteristic features. The system starts behaving rather strangely. This can manifest itself with different symptoms:

arbitrary switching on and off of the alarm;
wrong reaction
executing one command instead of another;
partial failure of some functions, etc.

If there are suspicions that the alarm is not working correctly, it is unlikely that you will be able to figure out the reasons and eliminate them yourself. Here it will be correct to contact the service center.

What to do if there is no response to the key fob

Often drivers get lost and do not know what to do if the alarm suddenly does not respond to the key fob. It is easy to explain this confusion. The alarm may go off and make very loud noises. The driver panics and does not understand what he should do.

It is much worse if, due to problems with the alarm key fob, it is not possible to open the doors. Then you should count on the quick arrival of specialists, the independent sending of the car to the service on a tow truck, or on a dead battery.

If there is access to the salon, but the alarm still does not stop, experts and experienced motorists give a couple of useful tips.

Use the emergency stop functionality. All car alarms have a secret code that allows you to disable security in emergency situations without a key fob. The code is reported to the car owner at the time of purchase and installation. It should be remembered.
To enter the code, you need to find a special Valet button. It is she who is responsible for the settings, connection with the control panel and performs a number of other important functions. The button itself is often installed near the fuse box. It is also likely to be under the steering wheel, on the dashboard, etc.
Find the button and enter the code. There is different variants, starting from combinations of pressing the button, ending with starting the engine, switching the gear knob in a certain sequence, etc. This already depends on the specific alarm.
An alternative would be to increase the signal strength. If your alarm suddenly stops responding to commands from the key fob, try to get into the car and bring the remote control as close as possible to the receiver. Here it is important to know exactly where the control unit of the security system is located. In this case, you need to actively and often press the key fob button. Often this method helps to cope with the situation.

Even when you managed to turn off the alarm, the problem still remains. The most correct decision would be to visit a service center for diagnostics. Specialists will check the status of the alarm, diagnose the key fob itself, and will be able to draw the appropriate conclusions, followed by repair and restoration work.

Spontaneous alarm

In addition to the fact that the car alarm may stop responding to commands from the key fob, there is another common situation among drivers. It is connected with the security system without objective and visible reasons.

Here, experts focus on 3 main reasons why this can happen to a car.

Contact problem. When the car is operated carelessly, or the car gets into difficult weather conditions associated with heavy rainfall, the contacts of the wires and buttons may oxidize. Because of this, commands begin to be transmitted, although the car owner himself did not press any buttons at the same time. To remedy the situation, you need to make problem contacts more frequent or completely change the limit switch.
Faulty door mechanisms. Sometimes there are other circumstances in which, after pressing the button, a notification is received that the car has been unlocked. Even though it doesn't actually happen. Here it is worth checking the condition and operability of the central lock. If the cause is not in it, then pay attention to the fuses and wiring. Mechanical failures cannot be ruled out. Plus, in conditions of extreme cold from freezing, the mechanisms for opening and closing the doors of the vehicle may not work.
The sensors are malfunctioning or incorrectly adjusted. The car contains a large number of alarm sensors, which are guided by the security system in the operating mode. The most common among them is the shock sensor. It breaks down or has settings that are too sensitive. Because of this, any slight impact leads to the fact that the sound and light signal is activated. Although at the same time, leaves from a tree simply fell on the car, a branch touched it, or a car just drove by. Here it is recommended to change the sensitivity settings. If the sensors are out of order, they must be replaced.

Alarm systems on cars are quite effective protection against burglary, theft and theft. But the security equipment itself needs careful maintenance and monitoring of its performance.

In most cases, the alarm stops responding to commands from the key fob for very banal reasons. It will not be difficult to remove them with your own hands. In case of more serious malfunctions, it is worth contacting the masters.

Car owners often face a situation where the Panther alarm does not respond to the key fob. The doors have to be opened with a key, which leads to the siren and an unpleasant experience. The reasons for the failure of the remote control can be very different:

dead battery. Replace with a new one;
the machine is in a radio interference zone. Park your car elsewhere;
insufficient voltage to trigger the alarm. Charge the battery;
anti-theft system wear. Contact the service center;
desynchronization of the operation of the key fob and the control unit. Re-register the remote control in the memory of the security system.

The alarm does not close the doors with the key fob

The Panther anti-theft system is represented on the modern market by models:

bidirectional: SPX-1, SLK-468, PR-1, SLR-5625RC, QX-270;
with one-way communication: CL-500, SLK-25SC, CL-700, CL-600, XS2500, CL-550, QX-44;
with autorun function: SLK-635RS, PR-2, SLK-675RS, SPX-2RS, SLK-650RS, LX-320, SLK-775RS two way, SLK-868RS, SLK-625RS.

These are inexpensive and reliable models of the anti-theft system. But sometimes they also fail. Key fob does not respond to buttons. Unable to unlock car. Consider the most common causes of alarm pager failure.

Remote control failure. Repair it yourself or contact a specialist.
The battery in the key fob is dead. Insert another.
The car battery is dead - there is not enough voltage to trigger the system. Charge the battery or install a new one.
Remote control "fell out". Write it back to system memory.
Control unit failure. Contact an electrician.

Pager Pantera SLK 10i does not work properly

At the most inopportune moment, the car alarm remote control refuses to work. The key fob does not work when the buttons are pressed, the car cannot be armed and disarmed. What are the reasons?

Remote control "fell off" remote control. Program it again in the system memory.
My battery is almost done. Change the battery.
The car is parked in a radio interference zone. Move it to another place.
Low battery voltage. Recharge the battery or replace it.
Failure of the alarm control unit. Contact the experts.

Keychain SLR 5100 fell off: what to do

There are several reasons why the pager refuses to work.

One of the most common is a dead battery. Insert a new battery and test the remote control.
Key fob out of sync. Rewrite the transmitter in the alarm system's memory.
Exposure to external radio interference. Park your car somewhere else.
Depreciation of the anti-theft complex. Contact the warranty center.
Low battery voltage. Charge it or install a new one.

The car does not start from the Panther remote control: how to fix

For the entire period of operation of the Pantera alarm, you once encountered such a problem as autorun stopped working. A car engine may not start for three reasons:

there is no control of a running motor - problems with programming, connection or with standard wiring;
problem with the wires to the handbrake;
low battery.

Remote start and stop of the engine is performed according to the following algorithm.

Tighten the handbrake, set the automatic transmission to “PARK” mode.
Set the air conditioner settings.
Set ventilation to recirculation mode.
Press the star key twice. Once the turn signals blink. The engine will start.
To stop the motor, press the button with the star symbol. A siren will sound and a 2 second vibration will follow.

How to turn on the key fob after replacing the battery

The battery is changed every three to four months, depending on how often the remote control is used. You can change the battery yourself by following the instructions.

Pry off the battery cover from below.
Slide to remove the cover.
Remove the dead battery.
Insert a new battery (type AAA). Observe polarity.
Set everything in its place.

After that, hold down two keys at the same time: "Open lock" and "Snowflake". The key fob must independently restore the communication code with the control unit.

How to turn off the Pantera car alarm without a remote control

If you have lost your pager or its batteries are dead, unlock the car with the key. Do not pay attention to the fact that the alarm is yelling, the lighting lights are blinking, the lights in the cabin are on. The security system worked normally, and you can turn it off even in the active phase.

Insert the key into the ignition lock. Turn on, turn off and immediately turn on the ignition.
Press the "Jack" key for 10-15 seconds.

The alarm mode will turn off, the blocking will be removed from the engine.

Quite often, during the operation of a car, owners are faced with the fact that. Often the problems come down to the fact that the car does not open from the key fob or the alarm does not see the key fob.

In this case, it happens that the alarm does not work completely or individual commands are not executed. In any case, if the alarm in the car does not work, the reasons may be different. Next, we will consider what breakdowns are most common, as well as how car alarms are diagnosed and repaired.

Let's start with the fact that if the key fob does not open the car, and this happened unexpectedly and for no apparent reason, there is a high probability that the power source in the key fob itself is discharged. In other words, you just need to replace the battery. Of course, this cannot be considered a problem.

A more serious problem is the situation when non-working buttons on the key fob are detected. It turns out that after pressing the arming or disarming button, the alarm key fob does not work.

As a rule, if the alarm does not open the doors, the control unit does not receive a signal from the key fob to disarm and the central lock does not work. With this, the close button and others can work normally.

In this case, diagnostics of the key fob is necessary, since mechanical wear of the buttons occurs, and malfunctions can also occur as a result of falls, moisture, etc. The solution in this situation is the repair or replacement of the alarm key fob with the subsequent registration of a new remote control in memory.

It may also be that the key fob works, but only at a distance of 20-30 cm from the car. In this case, the antenna module inside the remote control may fail, while the signal from the key fob is present, but too weak. Again, you need to disassemble and check. By the way, if you have the skills and equipment, you can independently disassemble the key fob, solder the buttons, antenna, etc.

We go further. As you can see, if the key fob does not see the alarm, there is no connection between the remote control and the control unit, then common cause is the keychain itself. However, this is not always the case. In some cases, the key fob can be completely serviceable.

To check this and more accurately understand why the alarm stopped working, you need to use a second (spare) key fob, provided it is available. If the system works fine with a spare key fob, then the reason is in the main remote control.

If both key fobs do not work, then the problems should be sought in the alarm itself, that is, the elements installed on the machine. This requires certain skills and a set of tools (screwdrivers, pliers, electrical tape, multimeter tester, wires).

So, the first step is to check the power supply. If the system does not open or close the doors, blocks the engine, etc., this often happens as a result of the fact that power is not supplied to the car alarm control unit.

Naturally, the system in this case will not respond to key fob button presses, the dimensions also do not blink, the car cannot be armed or disarmed. Also, as part of the diagnosis, problems in the wiring or contacts should not be ruled out.

Often, wires can break / fray, oxidation occurs at the joints, etc. In any case, to determine the problem area, the circuits need to ring with a multimeter.

If the ringing of the circuits did not help, then you need to separately check the fuses and relays. As a rule, if the fuse is blown, the system goes into blocking mode.

You may also encounter the fact that the system status indicator diode in the cabin is constantly on, and the alarm does not respond to commands from the key fob. Often this means that the central unit is frozen and needs to be rebooted. To do this, you will need to disconnect the terminals from for 10-15 minutes, then reconnect the battery.

If after such actions the turn signals start flashing and the system is restored, then this sure sign the fact that a software failure occurred and the unit needed a normal reboot.

Also in the list of reasons why the alarm in the car does not work or there are failures, one can single out the incorrect installation of the alarm itself or the immobilizer, the setting of the shock sensor, etc.

In this case, the shock sensor may not work, false positives occur, the immobilizer blocks the engine, the door locks may close or open arbitrarily or not work on all doors.

As for the shock sensor and other sensors (such as the motion sensor), in this case it is often enough to adjust to increase or decrease the sensitivity.

In parallel, it is possible to single out a situation in which, after arming the car, the doors are closed, the engine is blocked, however, if the doors are opened, the siren does not work and there is no sound. In this case, you need to check that power is supplied to the siren unit. If there is no power, this may indicate an open circuit.

If the Starline, Pandora, KGB and other models alarm does not work: useful tips

As you can see, in the event that the electronics are faulty, there can be many reasons (some of them were discussed above). On the initial stage you need to make sure that the key fob is in good condition. Also, the possibility of software failures of the alarm itself should not be ruled out.

If there are failures, you should check the immobilizer, sensors, the alarm control unit itself, ring the wiring, etc. You should also try to bring the remote control closer to the car (closer to the installation site of the central unit or antenna).

It happens that if the car is standing near an object where there is a strong electromagnetic field or a lot of radio interference, then the signals from the remote control are jammed. By the way, this situation is also not considered a breakdown.

Please note that if the engine suddenly stalls while driving, or after turning off and on the ignition again, the siren sounds and the internal combustion engine is blocked, this usually indicates a power failure.

In this case, the alarm unit responds to the fact that the voltage level has dropped below 8 volts and the system activates the blocking modes. This is an anti-theft feature that assumes that when power is restored, the locks remain and must be removed by the owner.

Of course, the engine remains blocked and the siren goes off. To solve the problem, you need to make sure that the battery is good and charged, and that power is supplied to the alarm unit normally, there are no wiring problems, etc.

We also note that common problem associated with the signaling may be the central module itself (control unit). The ingress of moisture or mechanical impact over time affects the operation of the unit, a short circuit may occur on the microcircuit.

In this case, the unit hangs, blocks the engine from starting, or the entire system malfunctions. In this situation, it is optimal to dry the unit, if necessary, its microcircuits are repaired. You can also immediately replace the microcircuit or carry out a complete replacement of the entire block assembly.

Summing up

Given the above information, it becomes clear that the main reasons for the failure of the alarm system can be associated with both breakdowns and software failures. The system may also not work stably if there are power problems, etc.

At the same time, it is important to immediately diagnose, so even the slightest signs of problems can be harbingers of more serious problems that will arise in the future. For example, if today the alarm works every other time or sometimes blocks for no reason, then after a while the blocking can completely occur on the go, the car doors cannot be opened, etc.

We also add that if the alarm is new (under warranty) and / or recently installed in the car additional elements, it is better to abandon attempts to repair with your own hands. In this case, you must immediately apply with a claim to the center where the security or anti-theft complex or other equipment was installed.

The car does not respond to the alarm remote control

If you are faced with the fact that when you press the alarm unlock button, the car does not respond, then you must first find out if the cause of the malfunction is really in the key fob. After all, it is quite possible that your alarm key is working and the problem is related to the breakdown of the car's electronics or the failure of its anti-theft security system.

In order to find out if your remote car key is working, you need to take the second key fob and use it to open and close the vehicle. It is worth noting that most vehicles come from the factory with two fobs or remote keys (some car companies even ship cars with three smart keys).

So, in order to determine the cause of the key fob failure, check if the spare remote key works. If your car still does not respond to the second (spare) key, then the problem is most likely not with the remote key.

In this case the problem is most likely related to the car's electronics. For example, most often it could be either a mechanical or electronic malfunction of the vehicle's door locks. It is also not uncommon when the car does not see the key due to a breakdown in the receiving antenna of the car alarm.

If your backup or emergency remote key fob opens the car and also closes it without problems, then this means that the main key is inoperative and the problem is not related to the malfunction of the car door locks. In this case, most likely, the power element (battery) has sat down in the key fob.

Unfortunately, not all car owners have a second spare car key fob. In this case, you need to check the operability of the key battery.

Check the battery in the car's remote key fob

Most remote car keys or alarm fobs use 7 types of batteries. Some cars use rechargeable batteries instead of batteries in the keys, which are recharged from the ignition switch while the car is moving. True, in last years automakers mainly supply new vehicles with key fobs powered by batteries.

So most often, drivers of modern cars, released quite recently, face the discharge of batteries in car keys. Including many vehicle owners, in addition to the regular car alarm security, equip it with an additional security complex to reduce the likelihood of theft.

As a rule, most non-factory car alarms also come with remote controls, with which the driver can open and close the car. Such remotes are also usually equipped with conventional batteries.

As a result, like any battery, sooner or later it will completely lose its charge. and the car key or key fob to the additional alarm will stop working. In this case, you have to change the old battery for a new one.

To change the battery in the car key, you first need to know what type of battery is installed in it. This can be done in several ways. The easiest way is to disassemble the key fob yourself and see which battery is installed in the remote control.

You can also find information about the key battery in the car manual, on the forum on the Internet, or call the dealership. But of course it is much easier to do everything yourself and just open the key fob and look at the marking of the battery, which is usually applied to the surface of the battery.

Typically, car remote keys that work with a car keyless entry system use 4 types of 3V coin cell batteries: CR2025, CR2032, CR1620, CR1632. Some vehicles use other types of batteries.

For example, many vehicle owners equip their vehicles with aftermarket security systems in addition to the factory ones. As a rule, additional car alarms are supplied with remote key fobs (panels) with which you can remotely turn on / off the vehicle security system.

In most cases, these remote controls use the following batteries as batteries: A23 (12 Volt), A27 (12 Volt) and AAA "little finger" (1.5 Volt).

Knowing the type of battery, you can check its voltage with a multimeter.

Also, if you have a new battery, you can simply install it in place of the old one and then check the operation of the key. If, after replacing the battery, your car began to respond to the key, then the cause of the malfunction was in a discharged battery.

If, after installing a new battery, the key still does not work, and the second key opens and closes the car without any problems, then most likely the battery compartment contacts were damaged in the key fob or there is a malfunction of the key buttons.

In particular, remember that in some car models, after replacing the battery in the alarm key, it is necessary to reprogram the electronic alarm, which, after a long discharge of the key, forgot it.

Faulty battery contacts in the car key

Unfortunately, not all drivers treat car keys, electronic key fobs and remote controls of the security system with care. For example, most often motorists drop keys or even fill them with water. In this case, any key may be damaged.

The most common key fob failure is damage to the battery contacts, as well as button wear.

The best way to check key contacts and button wear is to perform a visual inspection. To do this, remove the battery from the remote control and carefully inspect the contacts. If the contacts have oxidation or other damage, then this is the reason for the failure of the key. You should also check if the battery terminals are firmly seated. If the contacts move freely, then there is damage inside the key at the junction of the battery contacts with the remote control board.

If the battery contacts are good, then the most likely cause of the remote control malfunction is the buttons. Many keyfob remotes are equipped with rubberized buttons, which are subject to wear or damage due to the remote key being dropped.

So check all the buttons carefully. Pay attention to those buttons that either sink when pressed or are pressed too freely. It is possible that the key needs to be repaired.

Reprogramming the remote car key after changing the battery

In order for the remote control for keyless entry into the car to work properly, it must be securely connected via a radio channel to the radio receiver unit by the security system of the car. So, if your remote control has a dead battery, the car will not be able to recognize you as the owner of the car and will not disarm it.

Unfortunately, many car models stop detecting keyless entry fobs after changing the battery. This is due to the fact that the key fob and the security system of the car no longer understand each other over the radio channel. In this case, it is necessary to reprogram the keyless entry system in the car. Including some car models supplied with conventional remote keys may also stop recognizing the keys after changing the battery.

In order to restore the functionality of the remote key-fob in some cars, you need to open the car with a mechanical key, then insert it into the ignition (if you have a stop-start button, then you need to remove it to gain access to the emergency connector of the ignition lock) and initialize the remote , in which you changed the battery according to the manual for the car.

Unfortunately, within the framework of this article, we cannot describe to you all the ways to restore the functionality of the key due to its desynchronization after replacing the battery, since each automaker has provided its own individual method for reprogramming key fobs and keyless entry remotes in the car.

We will describe only the most common reprogramming methods that will help you register a new key, remote control, key fob or remote tag for a keyless entry system in a car.

For example, if your remote key is no longer recognized by the car, then, as we have already said, you must pull out the emergency key from the key fob or pull out the emergency key from the remote control and use it to open the car door. Then you must get into the car, closing the door and insert the key into the ignition .

Next you must turn the key to the working position without starting the engine. Then you must turn the key back. So you need to repeat several times until you hear sound signal, which will tell you that the security system has entered programming mode.

Then, after the beep, you need to press the button on the remote to unlock or lock the car, after which a beep will sound, informing you that the key has been synchronized with the car alarm.

In some models, in order for the car to enter the key programming mode, it is necessary to first insert the key into the ignition lock and pull it back out at least 6 times within 10 seconds. If your car uses this method of synchronizing (programming new key fobs) remote keys, then in the case of your right action you will see how the external lights start flashing (in some models, the icons on the instrument panel or hazard warning lights may also start flashing).

After the lights flash, you must insert the key into the ignition and turn it to the position that turns on the dashboard. Please note that you do not need to run. Otherwise, the car will automatically exit the key programming mode and you will have to start over.

After you have turned the key to the position that turns on the dashboard, press the button on the key (fob) to lock or unlock the car. If you did everything correctly, then you will also see the external lights flashing or the emergency lights flashing.

Unfortunately, it is not so easy to synchronize a new key on your own in all car models or re-register the key fob after replacing the battery. In some vehicles this may require special equipment. In this case, you may need to contact an authorized dealership or an unofficial auto repair shop that is experienced with your make and model of vehicle.