Do-it-yourself alarm keychain repair

In detail: do-it-yourself repair of alarm key fobs from a real master for the site my.housecope.com.

Unfortunately (for car enthusiasts), fortunately (for entrepreneurs), services that include a column in the list of services: repair of car alarm key fobs are flourishing, and all because they have enough customers. Installing a security system designed to protect against vehicle theft, it would seem, should solve all the problems of the car owner, but no one is immune from breakdowns. And, as a rule, the most vulnerable element of the system breaks, namely: the alarm key fob.

If the car alarm stops responding to commands from the control panel (key fob), then first you need to understand what is the reason for this development of events and only then decide what to do in this case?

There are enough reasons to either contact a company that repairs alarm key fobs, or spend time studying this issue in order to further repair the key fob yourself. To get acquainted with the list of the most common malfunctions of key fobs and the causes of them:

Buttons do not respond. The problem may be due to:
- sticky buttons;
- failure of the button itself, contact or wire as a result of natural wear or mechanical impact (impact);
- the absence of a sufficiently strong fastening of one of the elements of the main board (the contacts have come off).
- Weak illumination. The indicator LED is dim and the screen is dark. A malfunction can be caused by:
  - insufficient charge of the power source (batteries);
  - failure of the controller;
  - the departure of quartz from the processor;
  - violation of the integrity of the fastening of the contacts (often observed after the fall of the car alarm key fob).
  - There is no feedback. The system does not respond to commands sent from the key fob. Possible causes of the malfunction:
    - key fob decoupling (disruption of synchronization between the remote control and the elements installed on the car);
    - wear (breakage, damage) of the transmitter reception antenna;
    - the alarm was installed incorrectly (errors either during installation or connection).

Video (click to play).

There are other reasons forcing a car enthusiast to use the service: repairing the alarm key fob or trying to restore this most important element of the security system to its original characteristics with his own hands.

If the key fob is broken, it is not at all necessary to immediately buy a new remote control. In most cases, a faulty key fob can be reanimated. Some breakdowns can be repaired on your own. In this case, you need to act in stages:

Step one (diagnosis). First you need to identify where the failure occurred (disassemble the key fob into its component parts, ring the board contacts, the tester will point to problem areas, check the condition of the battery, carefully inspect each part for damage or wear).
Step two (feasibility assessment). Based on the results obtained, decide how to proceed further (contact professionals or still repair the key fob with your own hands).
The list of tasks that you can handle on your own (if you have basic knowledge that does not imply special training) includes the following items:

replacement of parts (a car enthusiast can replace such elements of a key fob device as: a case, a display, a button, but there is one “but”: it is rather problematic to find spare parts for some alarm models);
soldering contacts (gluing quartz with thermal paste);
reprogramming the control panel (detailed information on how to link the key fob to the alarm system, including those already stored in the system’s memory, can be found in the instruction manual).

Step three. Direct troubleshooting, performance check.

In the event that it was not possible to repair the key fob using your own skills and abilities, it makes sense to seek help from specialists. At the same time, neither the brand of the alarm system (Starline, Sherkhan, Pandora, Tomahawk, Pharaoh and others), nor the type of security system (GSM, GPS alarm), nor its class (economy, business, premium) matters. Highly qualified craftsmen are able to restore the functionality of the key fob of any alarm (if possible and justified).

The list of works available to customers of such a service includes such actions as:

diagnostics of the technical condition of remote controls (carried out using modern equipment that allows you to get accurate results within just a couple of minutes);
replacement of parts (display glass, display itself, faulty button, damaged housing, metal or plastic antenna, battery cover);
restoration of the microcircuit (elimination of breaks in the circuit of the main board);
car alarm key fob coding (reprogramming - in case of successful repair of the old one, binding of a new one - in case of an unsuccessful attempt to repair or the masters recognize it as an inappropriate event).

What are the benefits of professional repair? In 100% quality of work performed, confirmed by warranty and in a short time to solve the problem.

What is the downside? In need of parting with their own finances.

Summing up, I would like to say: in most cases, the car alarm key fob can be repaired. Breakdown is not a sentence!

The car alarm system is a complex electronic mechanism that can sometimes malfunction. Most often, problems arise due to malfunctioning alarm key fobs. If the security system is under warranty, in case of a malfunction, it is better to contact the service or the installer, in other cases, you can correctly identify the problem and try to fix it yourself.

If there are power problems, then the key fob buttons may not respond to pressing or perform independent actions, for example, opening and closing without pressing the button. As practice shows, in 90% of cases, a faulty battery is to blame. The failure of the latter is also indicated by the dim glow of the key fob power LED or the complete absence of a signal. To check, use the tester. At this stage, it is better to replace the battery with a new one, perhaps the problem will be solved by itself.

On some models of car alarms (StarLine, Pantera, etc.), after replacing the battery in the key fob, it is necessary to program it. As a rule, this process is described in detail in the instruction manual. To the sound of a screaming siren, you need to find the Vallet service button. With the help of it, an emergency shutdown of the alarm and automatic synchronization of the system with the memorization of various functions and key fobs occurs.

Sometimes the key fob can freeze even with a good battery. This happens when the alarm is in the range of radio transmitters, the so-called car alarm jammers. In addition, the operation of the key fob also depends on the degree of charge of the car's battery. In the first case, it is necessary to perform an emergency unlocking of the car alarm and leave the transmitter coverage area, in the second case, replace the battery and reconnect the wiring.

On some vehicles, connecting the alarm system involves powering a separate positive wire from the battery and accessing a separate system fuse.Then the tester checks the health of the fuse. At the same time, it is recommended to check other car fuses that may affect the signal malfunction (dimensions, sound signal, etc.). In some cases, you need to reset the power supply of the security system, that is, remove the connector from the contact, remove the terminal from the battery, wait a few minutes and connect everything in reverse order. After that, a beep will sound, and the key fob can “come to life” and work normally. Otherwise, the problem lies in the microcircuit and the contacts of the key fob itself.

Consider the DIY repair process using the popular StarLine alarm key fob as an example. Such a key fob is a small device with a color display, which also often fails. Image - Do-it-yourself repair of alarm key fobs

In order to disassemble the Starline keychain, you need to remove the battery, unscrew one screw on the left side with a screwdriver, the rest of the body is held on by latches. After that, we completely disassemble the keychain into its component parts. To do this, disconnect the transmitter and the graphite cable from the main board. Next, you need a multimeter, which you need to put on a dial; a unit on the screen and a sound signal on the device indicates a working electrical circuit.

Often one of the main buttons in the key fob fails, for example, the open and close button or the program button. After opening the key fob with a tester, we call all the contacts, including the contacts of the buttons, they should close together, which will indicate serviceability.

If the tester responds poorly, the buttons may stick. In this case, go over the surface of the buttons on the board with a toothbrush and a solution, while trying not to damage the display. If the tester does not respond at all, then the button or other wire or contact is “dead” and must be replaced. You can buy a button in a store or look for a “donor” button, for example, in an old player or radio with a similar microcircuit, from where it can be soldered.

At this stage, you should also check the fastening of all elements on the main board of the key fob. Often, after the key fob has been dropped, quartz (a fragile part on two legs under the display) can move away from the processor, it can be glued with thermal paste. Solder paste (flux) is applied to the place of the old button and cleaned with a copper braid. Next, a new button is installed, and all contacts are carefully soldered. We remove the solder paste with anti-flux and use a toothbrush to remove carbon deposits and other “industrial” dirt using a cotton swab dipped in an alcohol solution. Some old key fobs have special “tuning” capacitors, so it is not recommended to wash the entire board with an alcohol solution in this case.

The display on the key fob is also do-it-yourself, you will need a new display and soldering tools, as well as a multimeter, screwdrivers and other tools. If the malfunction cannot be solved by soldering and replacing structural elements with your own hands, it is advisable to purchase a new key fob, since repairs can be even more expensive.

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Service stations break a lot of money for simple computer diagnostics

To find out the mistake you need to go to specialists

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During the operation of the car, it becomes necessary to repair its systems and assemblies. The security system is no exception in this regard. To save money, you can do it yourself. In this article, you will learn how to repair car alarms and key fob with your own hands.

It is conditionally possible to divide all alarm malfunctions into the following types:

nutritional problems;
wiring problems;
software failure;
false positives;
key fob malfunction.

Let's take a closer look at each of the malfunctions in the car alarm.

Often the causes of incorrect alarm operation are power problems. This can happen both with the equipment installed on the car and with the car alarm key fob. The power failure of the system occurs due to a discharged vehicle battery. The machine stops responding to the owner's commands. The battery that serves as a power source for the key fob can also be discharged. In this case, the lamp and the display of the device will turn off. A decrease in battery charge can be noticed in a timely manner by reducing the range of the key fob.

The reason for the de-energization of the system is sometimes wiring defects. Over time, the contacts oxidize, which leads to the termination of the transmission of electricity. The wires themselves may also be damaged. This happens during the installation of additional equipment or when trying to steal the car. Another reason is faulty fuses. The same symptoms appear as with power problems - the car does not respond to commands. This is provided that the key fob is in working order.

Sometimes car alarm malfunctions are caused by incorrect operation of the control unit - the "brain" of the system. This is the result of a software failure.

These malfunctions are caused by errors in setting up or installing a car alarm. If the sensitivity of the sensors is set too high, the alarm will be triggered at the slightest shock or vibration. The triggers can be caused by small dry tree branches falling on the machine, rain or even a loud sound. Sensors set to optimal sensitivity, but mounted on plastic parts, will also not work correctly. The fact is that plastic amplifies the vibrations that the sensors perceive. When heated, this material expands, which can cause sensors to trip.

During operation, the key fob may start to work incorrectly or even break. The reasons for this are wear and various damage caused by a fall or exposure to water. A cracked display significantly reduces the information content and ease of use of the security system. Dropping the key fob can also cause damage to the quartz.

Before starting car alarm repair, it is necessary to find the cause of the malfunction. Completely different breakdowns can have the same symptoms. To accurately determine the cause of the malfunction, it is necessary to consider all possible options in stages.

You need to start with a keychain. Inspect it for mechanical damage and traces of water. If the key fob has been immersed in water, condensation will form on the inside of the display cover. The operation of such a device (if it turns on) will be unstable. If the key fob did not fall and fell into the water, but the display is off and nothing happens when you press the buttons, then the battery is to blame.

If the key fob is fully functional, but nothing happens when you press its buttons, then there can be two reasons for this - strong external interference or problems with the car and the alarm.Try to bring the key fob to the part of the car where the car alarm antenna is installed and press the button. If nothing happens, then faults must be sought in the machine itself or in the alarm equipment installed on it.

Next, power and wiring diagnostics are performed. Check the battery charge and inspect its terminals for oxidation. The completeness of the battery charge can be easily determined by the operation of the on-board electronics. If everything is normal, then the next step is to check the wiring. To do this, you need a special tester, which calls the contacts. Inspect the wires for mechanical damage. Special attention should be paid to fuses. Usually they are in a box, which is located on the wire coming from the positive terminal of the battery.

If the cause has not yet been found, then the defect in the control unit or the failure of its software is to blame. It will not be possible to eliminate such a defect with your own hands, but with a software failure everything is much simpler - it is enough to carry out simple manipulations, which we will discuss below.

Most often, repairs require a car alarm key fob. The buttons wear out and begin to respond poorly to pressing, and the device itself may fall on the asphalt or in a puddle. Button repair includes disassembling the case, cleaning the contacts and replacing the button pads (if necessary). To raise the recessed buttons, you can make a plastic substrate that is glued to their seats on the board.

Most often, when a key fob falls, quartz comes off its board. To eliminate this defect, it is enough to disassemble the key fob and solder the quartz to its original place.

To fix cracks in the display, you need to completely replace it. Remove the old display, clean the contacts and solder the cables of the new display. The process itself is not very complex and requires initial soldering skills. The difficulty lies in finding a new display. You can hardly find it in stores, so you have to order from China via the Internet. Defects caused by water ingress cannot be repaired by yourself.

Power and wiring problems are solved by cleaning battery contacts and terminals, as well as replacing fuses and damaged wires. In order not to do unnecessary work, use the tester to find the exact cause of the malfunction, and then eliminate it.

To eliminate the problem of false alarms, it is necessary to adjust the sensitivity of the sensors. The adjustment process is extremely simple. To do this, screw in or unscrew the adjusting screw located on the sensor housing.

To resolve software failures, you must reboot the system. To do this, de-energize it by disconnecting one of the terminals from the battery for a few minutes. If this does not help, then reset the car alarm to factory settings. A step-by-step reset instruction can be found in the instructions for your alarm model.

The best way to test a car alarm is to use it for its intended purpose. Arm the car and try to open the doors, trunk or hit the car. You should hit the wheels, hood and windows, gradually increasing the force of impact. After checking the sensitivity setting of the sensors, open the car doors with the key and try to start it, also using the key. The alarm should go off. Check the rest of the functionality, depending on the specific model, the functionality will be very different, we suggested how to check the basic and general alarm functions.

Most of the problems associated with the operation of car alarms can be fixed by hand. It is better to entrust the repair of the control unit and other complex electronics to specialists. If, after following the above recommendations, the breakdown is not eliminated, then you need to contact the car service.To continue driving with a broken alarm, you need to master the process of turning it off with a secret button, which you can read about in the instructions for the car alarm.

It would seem that it is easier to take and replace the battery in the alarm key fob. The owner himself will be able to perform this action without errors. Only now, after the replacement, the connection between the key fobs and the signaling is lost for some reason. In fact, there is a loss of synchronization, and the consequences of this "loss" can be corrected according to the text of the manual supplied by the manufacturer. Here we consider what actions should not be allowed when repairing car alarms, as well as immobilizers and key fobs.

A keychain with feedback, or the so-called pager, contains several elements in its design. The display is connected to the printed circuit board via a cable. But soldering this part (cable) is difficult in practice. That is why the replacement operation has an increased cost.

Nevertheless, you can do the indicated replacement with your own hands. As proven in the video.

Having disassembled and opened the plastic case, you will notice an important detail covered with a metal shell. The cylinder is watch quartz, and you need something like that.

Let's say the pager's display shows that there is no connection. In this case, the alarm key fob is repaired as follows:

Solder the junction with the antenna, assemble, check;
If the defect remains, change the main quartz.

In general, the repair of car alarm key fobs does not involve the search for defects with the help of special equipment. More often they are guided by logic, changing "suspicious" components and details. They also seek to eliminate mechanical defects: replace button modules, restore contacts. The main thing is to remove all power elements before soldering. And wait 20 seconds.

Do-it-yourself keychain repair is a painstaking and complicated job. Having removed any battery, it will be necessary to restore synchronization. But equipment that works with dialog code does not lose synchronization.

In any modern car, a module is installed that automatically blocks the engine. Such modules are called "immobilizers", and their malfunctions are characterized as follows:

The starter cannot be started even with your own (regular) keys;
Commands from the buttons of the remote control (key) are not perceived in any way.

It happens that the malfunction lies in the electronics of the remote control. But hardly anyone will undertake to repair it.

Here we consider how to repair the immobilizer, more precisely, the antenna and the main unit. The block itself, at least, can be disassembled by hand without using special equipment.

The standard equipment of the MAZDA GF-626 is an immobilizer, in which the main communication frequency is set by a ceramic resonator. The specified part looks like this.

Over time, details change. Therefore, the immobilizer repair will consist of the following: we solder the “bad” resonator, install a new quartz in its place. The frequency of the quartz resonator can be selected experimentally (here the numbers 2.4576 are indicated on the case).

Let us make a digression regarding the choice of resonators. Having bought a replacement quartz with the corresponding numbers, a good result can not always be obtained. The reason is the following:

Low thermal stability;
Frequency jitter.

In general, a new part is selected as one of several. What you need to know when repairing an immobilizer, key fob and even an alarm. Who said it would be easy?

The immobilizer reads data from the key, establishing communication with the latter via radio. For standard automotive systems, the following is typical: an inductive antenna is wound around the ignition switch. Let's say you can't start the starter even with your own keys, stitched in the memory of the main unit. Then the immobilizer repair begins with checking the antenna, completely disconnecting it from the connector.

The appearance of the antenna module is shown in the figure above.It may turn out that the resistance between the black and white wires is infinity (open).

No one will succeed in winding a similar coil with their hands. But you can do the following:

A soldering iron without solder is installed between the turns, and each turn passes like this until the ohmmeter shows 5-10 ohms;
The gap is eliminated, even with the appearance of short-circuited turns.

When repairing the alarm, you will not encounter the problem discussed here. The antennas are located there in a separate module, and their appearance inspires respect.

Consider the scheme of the main module of a home-made signaling.

The value of all resistors sometimes has to be selected so that the operation is stable. This must be remembered when repairing an immobilizer or signaling device that does not have electromagnetic relays in its circuit.

Alarm repair is a difficult task, and special training is needed to solve it. But the block design provides for the replacement of blocks. This property should not be neglected in practice. The choice between the speed of repair and the cost due to the price of the unit or module will be made by the owner.

There are many publications on how to repair the electrical equipment of a car with your own hands. These publications give advice: you need to disconnect the negative terminal of the battery. Probably, this recommendation should not be neglected by anyone. We wish you success.

The remote control of the anti-theft complex is the main control device. If it breaks down, the consumer will be able to use the main signaling options - enabling and disabling the protection mode, but other functions will not be available. Car alarm key fob repair can be done by hand.

If there are problems in the power supply, then the remote control buttons will stop responding to commands, the signal transmission will fail.Sometimes alarm communicators Alligator, Sherkhan and other models randomly send commands to unlock or lock door locks. In most cases, the reason for this is a faulty power source, this will also be indicated by a weak glow of the diode bulb on the device case or the absence of a signal. To diagnose, you can use a multimeter, but it is better to immediately change the battery.In some models of Pandora, Starline, Panther and other signaling devices, after changing the power source, reprogramming of the device is required so that the device can work. The binding procedure is always detailed in the technical instruction manual. To carry out this process, you will need to find the Jack or Override service key, which is used to emergency shutdown the complex. Depending on the model, the button must be pressed several times with the ignition switched off or activated; check the exact number of presses in the service book.The Telemaster Korolev channel tells about the reasons for the failure of the Starline key fob button and its repair.It happens that the car alarm key fob freezes with a working power source. This problem usually occurs if the machine is located within the range of anti-theft jammers or other sources of interference. The solution lies in the emergency shutdown of the protection mode, after which the car owner must leave the interference zone. The operation of the communicator largely depends on the amount of charge in the car battery, so if the battery runs out, it must be charged or replaced.Sometimes the problem can be solved by rebooting the processor module, for this you need to remove the plug from the connector, disconnect the battery and reconnect it after a few minutes. An audible signal may sound, the pager will restore its operation, if this does not happen, then the malfunction should be sought in the operation of the board and contact elements.You can repair a failed communicator yourself, we will analyze the repair process using the example of a pager from the Tomahawk 9010 signaling.Practice shows that the control devices of these models fail more often than others.AlanMorfreeman told about the repair of the pager.You need to repair the device after disassembling the case:After diagnosing the board, the fasteners are checked on the diagram:

If the pager fell, then the quartz element could be disconnected from the main processing unit. This part is quite fragile, it is fixed on two contact elements under the screen. In case of minor damage, the quartz is glued to the board using thermal paste.

Instead of the old key, flux is applied to the circuit, stripping is carried out using a copper braid.

A new key is being installed, all contact elements are securely soldered, this will require a soldering iron with a thin tip.

Solder paste residue is removed from the board using a toothbrush and anti-flux. The remnants of soot, as well as dust, are removed. To do this, take a cotton swab and treat it with alcohol. It is not recommended to completely treat the circuit with a liquid; trimmer capacitor devices can be used in older models of communicators. Exposure to alcohol will damage them.

You can change the screen on the device yourself, for this you need a new display. The work is carried out using a tester, screwdrivers, soldering iron and other tools. Before installing a new screen, all remnants of cracked glass are removed from the board.

Anton Baitov talked about how to repair the transceiver keys.If you cannot repair the car alarm key fob by soldering, it makes sense to buy a new communicator.In large cities, there are dozens of specialized service centers that offer services not only for repairs, in such workshops you can find used keys with key fobs from different models of signaling devices. Pagers are often repaired by qualified electricians. You can find specialists without leaving your home by looking at ads on the Internet.Many service centers today offer repair services for communicators:

replacement of screens on consoles;

replacement of pager cases, protective glasses, contacts, etc.;

full restoration or reconstruction of devices, flashing devices.

The cost of the service depends on the nature of the damage. The minimum repair price will be at least 250 rubles, the region of residence and the alarm model play a role in determining the cost. To repair communicators of modern complexes, you will have to pay a higher amount. Button replacement services are cheaper than repairing the board or changing the display.The cost of repairing the alarm key fob depends on the type of malfunction.Eugene Irimia demonstrated the procedure for repairing keys on a DaVinci car alarm pager.In order to protect the car, StarLine brand alarms are often used. Security systems are functional and reliable in operation. However, with prolonged use, car owners find that the starline complex does not work. Breakdowns are mainly faced by car alarm key fobs, the repair of which can be done independently. First you need to find out the cause of the breakdown and choose the best way to eliminate it.ATTENTION! Found a completely simple way to reduce fuel consumption! Don't believe? An auto mechanic with 15 years of experience also did not believe until he tried it. And now he saves 35,000 rubles a year on gasoline! Read more"

The StarLine alarm key fob most often encounters the following malfunctions:

Battery failure. A sign of a low battery will be the absence of a car alarm response to any actions, the LED light will deteriorate and the feedback range will decrease. Installing a new battery takes a minimum of time.

Display damage. Occurs due to mechanical action.In some situations, even the cover does not protect against damage. Replacing the screen is a time-consuming process, so you should use the device carefully.

Hull damage. Drops and impacts may cause scratches on the case, or it may be completely broken. The body of the StarLine key fob has a low strength and does not withstand high loads. If it breaks, it will have to be completely replaced. The chance of damage is reduced when using a case.

Button breakage. If you push them hard, they can sink, damaging the internal components. The button may look good, but it does not respond when pressed. For repair, you will have to disassemble the device completely, check the boards, dismantle the old one and install a new element. The complexity of the procedure is the need to work with a soldering iron with a thin tip. Carelessness will damage the buttons and the board and the need to purchase a new starline key fob.

Buying new parts is quite difficult, as most stores offer to buy a new car alarm device. If the key fob is working normally and has some malfunctions, it is advisable to repair them. If there is no housing, screen, cover or buttons at the point of sale, you should find components for the alarm key fob on the Internet. Spare parts can be purchased at low cost.

The starline alarm key fob can be easily disassembled. The fasteners are removed with a screwdriver, after which the case and buttons are removed. The device is fully functional, but it shows traces of damage to the display. For ease of repair, you need to remove the board with the antenna.

The display is removed completely by detaching from the backlight pad. To do this, a flexible graphite cable is carefully peeled off from the contact pads.

The contact pads of the alarm key fob are cleaned. The new screen must be tried on and checked for compliance.

Then the repair of the Starline car alarm key fob becomes more complicated. Experts recommend building up special wire needles on the legs and soldering. This method does not always work, as the points are quickly unsoldered. For the alarm keychain, you should use a soldering iron with a thin tip and tin to get a kind of "bridges". If the device has a thick tip, copper wire can be attached to it. Having connected the screen to the site, it is worth proceeding to the next stage of work.

Since the screen of the alarm key fob was completely removed, it should also be attached to the body. It is worth working carefully so that the device does not break again and is not immersed in glue. The adhesive base should be only on the sides of the glass and connect it to the frame. If glue gets on the glass, it will take a long time to clean it.

The next step is to install the board in the car alarm housing. Basically, the part falls into place with ease. Installing a new case and case can be difficult. If there are unnecessary pins in the new case, they must be cut off with a clerical knife. Then fasteners are installed on the car alarm panel with a screwdriver. Then you can put on a protective cover for the key fob. The display has a special protective film. It can be eliminated at the time of assembly of the device.

It is important to check the key fob for performance. The display should show all the necessary details, it should respond to button presses and all alarm functions should be performed when necessary. If the device is fully functional, you can start operating the car's security system.

Video (click to play).

The Starline brand car alarm key fob often encounters malfunctions. To prevent them, you will need to install a cover and be careful during application. Spare parts for the device are low cost and easy to install. Do-it-yourself keychain repair is available, subject to the recommendations of specialists and following the proposed instructions. With a minimum of effort, the car owner will be able to use the car's security system again.

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