Do-it-yourself car anti-theft system. Overview of car anti-theft devices

Every car owner is afraid that his car will be stolen. That is why we spend a lot of money on insurance and anti-theft systems. Unfortunately, even the most expensive alarm systems do not provide 100 percent protection. So why then buy an expensive security system if it's not 100% effective? Yes, it's not logical.

In most cases, an inexpensive electronic car alarm will do. Theoretically, by installing an inexpensive security system on a car, we slightly reduce the safety of the car. But what to do? How to increase the protection of the car in this case? Fortunately, there is a simple but very effective solution. Few people know, but every driver can make his own anti-theft device in a short time, which will be very cheap.

In order to protect the car from theft, you need to install in the car in advance faulty relay fuel pump. To do this, you must find a faulty fuel pump relay at a junkyard, or deliberately break a new one, making it inoperative. You can also drive up to any car service and ask the car repairmen for a faulty relay.

If your fuel pump relay is currently not working well, then this is the best time to buy a new one, and use the old one to additionally protect the car from car thieves. The purpose of protection is simple. When you leave your car in a parking lot, you remove the good fuel pump relay from the car and replace it with a bad one before you leave.

As a result, in the event of an attempted car theft, attackers will face a problem. Your car won't start. The reason is that the engine will not receive fuel due to the fact that a broken relay will not start the fuel pump. Accordingly, the spark during the start of the car will have nothing to ignite.

If you do not have a non-working fuel pump relay, we will tell you and show you how you can make a fuel pump anti-relay from a working relay that can confuse intruders at least for a while.

Step 1: Locate the fuel pump relay in the car

The first thing you need to do is find out where in your car the relay that controls the fuel pump is located in the fuse box. To do this, open the fuse box (if you don’t know where it is, you can find it in the user manual or in the book for the operation and repair of your car, which you can buy on the Internet or in a car shop) and using the same car repair book (perhaps that information about the fuse block diagram is also in the instruction manual vehicle) determine which relay is connected to the fuel pump. Once you have found the relay, remove it from the fuse box.

Step 2: Locate the Fuel Pump Relay Power Pin

The easiest way to find out is to use control light or special tool(for example, an indicator screwdriver with a light that lights up when an electric current passes through the circuit).

Using an indicator screwdriver, you should check each connector on the fuel pump relay to find out which prong powers the relay.

Remember or write down those contacts on the fuse box board that do not supply power to the fuel pump relay. It is easy to find out with the help of an indicator screwdriver. If there is no power on the contacts, then the lamp inside the screwdriver will not light up. Check all the contacts on the board into which the fuel pump relay is inserted. Remember the contact on which the light in the indicator screwdriver lit up. This is exactly the connector through which power is supplied to the relay.

Do not forget that power is supplied to the fuse box only when the key is turned in the ignition switch. Remember that if you don't insert the ignition key into the lock and turn it, you won't be able to figure out which pin on the fuse box powers the fuel pump relay.

Step 3: Break the Fuel Pump Relay

Now it's time to spoil the working relay of the fuel pump by removing one "leg" from it, through which power is supplied. To do this, you just need to break off exactly the “leg” of the relay that is inserted into the power contact, which we determined using an indicator screwdriver.

The "leg" of the fuel pump relay is very easy to break. Just move it from side to side and it will break.

Now in your hands effective remedy against car thieves. If you install such a non-working fuel pump relay, then due to the fact that the relay will not receive power on the fuse box board, the car engine will not start.

This good anti-theft device really reduces the chances of your car being stolen. After all, the hijackers will not be ready for such problems with starting the engine. Yes, of course, professional car thieves will probably establish the cause sooner or later.

But for this they need more time. And in combination with a regular car alarm, as well as with an additional electronic security system, your secret relay will possibly force intruders not to contact your car. It's no secret that car thieves steal cars that can be stolen in a short time. And when faced with an unforeseen problem, they are likely to prefer to retire.

This simple and cheap way to protect your car from criminals will always come in handy. Especially if you left the car in an unfamiliar area. By installing a non-working fuel pump relay, you will be much calmer while your car is in the parking lot.

Yes, of course this device is not very convenient. After all, every time before the trip you will have to change the faulty relay to a working one. But, nevertheless, this additional obstacle to criminals can stop car thieves and can actually save your car.

Ideally, of course, for optimal protection of the car, you need to use a set of protective anti-theft systems. For example, using a standard (factory car alarm), an additional anti-theft security system, mechanical protection(for example, a lock that blocks the brake pedal, gearbox or steering wheel), as well as a secret fuel pump relay, you really significantly increase the burglary resistance of your car and significantly reduce the risk of theft.

In conclusion, we would like to note once again that there are no stolen cars. Remember that even the most expensive security systems cars do not guarantee you 100% protection against theft. So why overpay for expensive security systems when you can use ordinary inexpensive car alarms, mechanical protection and a fuel pump anti-relay to get about the same level of car security that you get when installing expensive anti-theft systems.

Do-it-yourself anti-theft - it's not difficult!

Look at the photo below, it just shows a homemade mechanical anti-theft device that is easy to make with your own hands.

As you can see, there is nothing complicated in such an anti-theft for a car. In fact, this is just a bracket with holes (ears) for fixing with a conventional padlock.

The only difficulty in the manufacture of such a mechanical anti-theft system is the need for a welding machine to make a “heel” with which a home-made anti-theft device does not allow an attacker to press the car pedals.

In general, mechanical anti-theft systems are the most reliable. Especially if they are made by a very non-standard method. It is impossible to get around such a do-it-yourself car anti-theft. You can only break it. However, it is not so easy to do this, because in order to break this anti-theft system, it is necessary either to break the lock or saw through a curved metal plate.

The padlock is strong enough, it is not possible to knock it down with a sledgehammer blow or with the help of a crowbar - as there is no room for a good swing. It’s the same with a saw for metal - you won’t really turn around. Of course, you can drill the lock cylinder or use the "bumping" method to open it. However, car thieves do not go into such areas of knowledge; usually “burglars” specialize in this.

By installing such an unusual homemade anti-theft device, you will make your car "problematic", and car thieves prefer to problem cars do not contact. If they cannot manage in 10 minutes, they prefer to leave such a car and look for a more pliable "victim".

Of course, in a Lamborghini or Mercedes, such an anti-theft unit will look wild, but it is unlikely that the owners of such cars will read articles on how to make an anti-theft device with their own hands. :)

Jenny comments:

going to start

Victor comments:

Nonsense! It moves up. does not fit snugly to the pedals ... It must be detachable and with two locks

Artem comments:

Viktor, open your eyes! Below this homemade anti-theft the support is installed - hell, where will it move!

Michael comments:

It's a "thing"!!! I think on inexpensive car this self-made will justify itself. The hijacker has a lot of trouble with her.

Gennady comments:

I think if a protective box is built on top of the lock and if the entrance to this box is made from the side of the floor ---- feeling for the lock cylinder with a key - putting your hand inside ---- then I can argue with anyone --- do not open the lock and knock down by definition. Just figure out how best to implement the idea ....

Alfred comments:

simple and reliable way. From the wire leading to the minus of the reel, a tap is made to a toggle switch hidden in the cabin. 2nd end from the toggle switch to ground. This option cannot be overridden. To get around such a secret, you need to find the indicated wire in the bundle and cut it.

Vandal comments:

Excellent, Alfred! Thanks for the idea, I'll make myself such a secret.

Demon comments:

right now, mini-grinders with batteries in bulk.

Alfred comments:

On older cars, an additional wire was installed from the negative terminal of the reel, it is brought into the passenger compartment and connected to the mass of the car through a hidden toggle switch. When the toggle switch is on, the engine will not start.
On new models of cars, the same hidden toggle switch breaks the power supply circuit of the electric fuel pump.
Tested on many machines by me personally. Even in the service, fixing this “malfunction” takes a lot of time. Installing all this on your own is not a problem and does not require expenses (toggle switch and wire).
All blessings.

Alfred comments:

I want to add about the wire with the toggle switch. This method was invented by Soviet skilled drivers before the 1941 war.

Electronic alarms do not always allow you to protect a car from unauthorized access, so many people use additional funds security. In this article, we will consider what anti-theft mechanical devices for cars and how they differ from each other.

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Types of mechanical anti-theft systems

On sale you can find different types devices designed to protect machines.

The most popular of them are castles:

• hood;
• steering shaft;
• ignition;
• doors.

There are also various types of locks, for example, the steering wheel, pedals and wheels.

Checkpoint locks

Anti-theft mechanical means for cars can perform the function.

On sale you can find several variations of such devices:

1. Arc. Such models, when activated, fix the transmission in one of the positions, fastening is carried out by means of a special bracket. This element covers the gearshift control lever. Modern devices are equipped with special larvae with increased cryptographic resistance. To ensure maximum security, a floating PIN code is used, which makes it impossible to pick the lock with a master key. The main disadvantage of such systems is their large size.
2. Pin type devices. This is a more modernized version of the locks described above. The main element of the anti-theft is a metal pin designed to block the transmission. As a result of its operation, driving a car will be impossible. The block body itself is made of steel. Unlike arc systems, pin devices harmoniously fit into the interior of the cabin.
3. Wireless blocker. This type of locks for checkpoints is the most advanced. The blocking procedure is carried out directly inside the structure. Turning the blocker on and off is only possible with the key.

The Omkey channel made a video showing the process of cracking a mechanical transmission lock.

Hood locks

The main purpose of this hijacking device is to protect the engine compartment from the penetration of criminals.

The degree of reliability is determined by the security of the larva. If it is not thought out by the manufacturer, then it can be easily hacked. The main disadvantage of such blockers is the weak protection of the drive cable. An attacker can gain access to the lock without getting into the car interior.

Steering locks

With your hands under the steering column, next to the pedal.

The device of such a lock includes several parts:

• locking mechanism;
• locking element;
• latch operating in automatic mode;
• clutch;
• bolts;
• key (sometimes lock manufacturers use secrets).

The principle of operation of the blocker is to clamp the steering shaft with a clutch, which structurally consists of several parts. This element rotates with the steering wheel, so it is impossible to notice it with the naked eye. To activate the blocker, the driver must insert the locking element into the corresponding groove and close the anti-theft. As a result, when you try to rotate the steering wheel on one side, it will rest against the engine shield, and on the other, against the pedal.

Opening such a device is difficult. Most effective option blockers are considered in which keys and larvae are not used, but secrets are mounted instead. You can get around such an anti-theft by cutting it with a grinder, but with such a tool, hijackers rarely go to work.

The oblomOFF ART channel in the video spoke in detail about all the advantages and disadvantages of this type of blockers.

Ignition locks

The body of such blockers is made of alloyed steel. The basis of the castle is a device of high secrecy. Some models are additionally equipped with protection of the starter device against reactivation.

When you try to break into the structure, the electrical circuits are broken, with the help of which the engine starts. When installing, the toggle switch must be brought out, and then disguised so that intruders cannot find it. On sale you can find several types of locks - with radio-controlled and touch control. To install the device, it is better to contact specialists to ensure the complete reliability of the system.

Door locks

Door locks are used to prevent a criminal from entering the interior of the car. The lock is made in the form of a steel pin that blocks the door even if it is open. The locking procedure can be carried out using a key or using a special key fob, depending on the type of system.

Steering wheel locks

This type of blockers is designed to be installed on the steering wheel rim or its spoke. The essence of the action is that in the event of theft of the car, the attacker will not be able to turn the steering wheel. The second part of the lock will rest against the door or the central panel. There are blockers, one part of which is installed on the steering wheel, and the other on the pedal.

Most manufacturers offer consumers devices that can be easily hacked. But you can find locks that use a reliable secret. Hacking such devices will be problematic.

Pedal locks

There are two types of pedal locks:

1. The persistent device preventing pressing a pedal. The main disadvantage of the blocker is inconvenient installation, although sometimes this disadvantage can become an advantage. In the event of a break-in, or when trying to steal, the larva of such a lock will be difficult to crack due to its inconvenient location. This moment works, even if the secret is very weak.
2. A retaining lock that blocks the operation of the pedal at one end, and clings to the steering wheel with the other. Installing such a lock is much easier, but usually such blockers have massive dimensions.

Wheel locks

To ensure protection, the car owner must stop the rotation of one of the drive wheels. This will prevent further movement vehicle. The blocker is installed on the machine wheel and fixed on the disk. The main disadvantage of the castle is that it is inconvenient to use. The dimensions of the device are large, you will have to carry it in the trunk. The use of a lock is relevant if the owner plans to leave the car for a long time in an unguarded parking lot.

Photo gallery

Wheel lock Theft protection mechanism

Ranking of mechanical systems firms

TOP of the most popular manufacturers:

1. Interception-Universal. The lock is made in the form of a steel cylinder, which is mounted on steering column. The blocker is fixed in a certain position, and when it closes, it will no longer be possible to turn the steering wheel. The case and the secret part are made of stainless steel, which prevents the possibility of rapid wear devices. The procedure of installation and dismantling can be done in a few seconds. High reliability provided due to the fact that the device does not have a keyhole. The blocker turns off special key, made in the form of a ring with notches located on it. average cost 7300 rubles.
2. Python. The principle of operation of the lock is to block the steering wheel from turning. For this, an elongated pin sheathed in leather is used. This element rests on the control panel. The main advantage lies in the use of reliable protection against different options hacking. The Python lock blocks both the mechanical and electronic components at the same time, we are talking about the steering wheel, as well as the starter device. The blocker is equipped additional protection from lock picks and other devices that can be used for hacking. If the criminal is able to open the lock, then he will still not be able to start the engine, since the starter device is started using a special key located on the remote control with keys. The price of the device is about 7600 rubles.
3. Ignition lock Garant Bastion. The device is characterized by increased secrecy of the blocker larvae. Implemented in the castle reliable protection starter device from reactivation. The average cost is 8800 rubles.
4. Defentime. A device belonging to the category of hood locks. The main feature is the use in the production modern technology protection. In fact, breaking such a lock is very difficult. The design of the blocker is made of durable materials, so if an attacker decides to cut the lock, he is unlikely to succeed. The price, depending on the model, ranges from 2500 to 7000 rubles.
5. Barracuda. The company produces both universal models of locks and locks designed for specific models. We are talking about locks for gearboxes. Installation of the device takes about two hours. For greater convenience, you can use universal solutions. These locks allow installation on regular places, the car owner does not have to drill additional holes. The blocker itself has a rigid contour, which helps to increase the mechanical strength of the device. approximate cost 4500 rubles.

Remember that no mechanical blocker can guarantee one hundred percent protection of a car from theft.

A simple but effective do-it-yourself anti-theft device. Such a device can be made quite quickly and simply. complex and expensive parts not required, but, despite this, the device can be very useful in protecting your favorite "horse". At present, anti-theft devices have taken the path of complication, and in their manufacture there are already even space technology, but despite this, the protection of the car is still relevant. Hijackers are also evolving and using the same modern technologies.
Perhaps this simple device will be the tool that will confuse the kidnapper, who expects that “cool” anti-theft ones are everywhere.
The scheme works like this: anti-theft is on. The attacker opens the door, turns on the ignition, starts the engine and rejoices that he succeeded. But suddenly the engine stalls. He starts it again, but after 5 - 15 seconds (depending on how you adjusted the anti-theft device), the engine stops again and there is a feeling that there are problems with fuel system. But he will not find a malfunction, since the time relay blocks the engine ignition system with a delay in the blocking time, and not the fuel one.
The proposed anti-theft device, in fact, is a relay with a time delay to turn on.

Here is his diagram

Parts are used for this device.

• Chip D1 - K176LA7 or her imported analogue CD4011.
• Transistor VT1 - KT315 with any letter or import 2SC634, 2SC633, BFP722, 2N2712, BFP720, BFP721, BFP719.
• Transistor VT2 - KT815 or BD 135, BD 139, BD 137.
• Capacitor C1 - 33 uF 25 volts.
• Capacitor C2 - 10 - 20 uF 25 volts. This capacitor is the time setting, which means that the value of the time delay before the relay is turned on depends on its capacitance. With a 10 uF capacitor, the time is about 7 seconds, and 20 uF, about 15 seconds, but it also depends on the resistor R1, which is also a component of the timing chain - R1 - C2 and the time also depends on its resistance.
• R1 is about 300 kΩ, but I set the potentiometer to 680 kΩ in order to be able to demonstrate the change in the time delay before switching on the Rel1 relay, depending on the value of its resistance. IN finished device, when you have decided what time delay suits you, the potentiometer can be replaced with a constant resistance, equal to resistance potentiometer.
• R2 - 100 Ohm.
• S1 - any toggle switch that you like. It will be securely hidden in the car.
• A toggle switch is connected to terminal 1, and the toggle switch is connected to a wire that receives power after the ignition switch is turned on.
• Terminal 2 is connected to the ignition switch wire. When the device is turned on, the anti-theft relay contact will close the breaker wire to ground and thereby turn off the engine.
• Terminal 3 is connected to ground.
• It is better to make a device on a breadboard, it will be easier and faster.

Device Assembly

We solder the wires to the toggle switch and the potentiometer and connect them to the circuit.

Nowadays, not everyone is in a hurry to equip their car with locks, sirens and mechanical traps. Many are firmly convinced of the inviolability of protection, the rest rely on a full-fledged insurance compensation. Personally, I have a different view on the methods of preserving movable property. If someone covets my car, let them call a tow truck - other methods of hijacking just won't work.

My advice is designed to protect against theft of relatively inexpensive car. They do not require major investments.

Signaling

You can install the alarm yourself, or you can entrust the work to a specialized workshop or car dealership where you buy a car. Choose alarm from feedback. And connect so that it reacts to various, but does not open door locks. Opening and closing (or just opening) the doors should be controlled by the buttons on the standard key. This is the first and fairly reliable line of defense: the hijacker will not be able to open the car with the signaling code intercepted using the grabber code. Let him look for another.

Against the "bears"

Often intruders open doors by turning the lock cylinder with force. Therefore, I advise you to remove the traction coming from the larva to the lock - then the cranking will not work! But there is reasonable question: how the owner himself will get into the car if after long-term parking? In this case, I propose two methods of emergency access to the cabin - electrical and mechanical. And it's better if you implement both at once.

To build an electric "redoubt", it is necessary to pre-stretch a hidden wire from the "plus" of the battery (through a 20 A fuse). IN emergency pull it out through the gap between body elements or from under the bumper, remove the insulation from its end. "Minus" will have to be looked for on the towing eye or taken from somewhere on the body. Suspension parts due to rubber elements are often completely isolated from the "mass". We supply voltage of 12 V from a third-party source through wires of any section - the power supply is restored, the electric locks can be opened.

Another way is to stretch inside driver's door thick (about 1 mm) fishing line so that by pulling it you can unlock the lock. At the end of the fishing line we make a loop and bring it to a place where it is easy to hook it. Stretch the fishing line so that it does not touch the sharp edges of the body parts.

Internal protection

Suppose that the attacker still got into the car - for example, by breaking the glass. He does not have a key, as well as an electronic head - a counterpart to regular immobilizer.

If the hijacker solves the problem with the mechanics harshly, with the help of a convolution, then he neutralizes the immobilizer with the so-called winder. This device replaces the ignition key code or sets the engine control unit to emergency mode, in which the on-board electronics do not require a "password". The thief's device is connected to the OBD connector. Hence it follows: you need to remove the connector!

More precisely, an additional male-female connector of a completely arbitrary configuration, for example, a computer or from a car radio, should be installed in the open circuit of the standard OBD. The location of the contacts will be known only to you, and when you connect the "adapter" with a standard OBD connector, all output signals will be in the appropriate places. We leave the "adapter" at home or hide it in the car. It will be needed at scheduled maintenance so that the dealer can diagnose the system with a scanner.

Block to block

Without finding the OBD connector, the crook can try to replace the standard engine control unit with his own, which does not require a signal from the immobilizer. Therefore, under the hood it should be waiting for ... the “safe” of the ECU is a kind of steel welded box that covers the control unit and connectors. You can install and remove it only by dismantling the battery and unscrewing a certain number of bolts and nuts. For greater protection, you can put fasteners with shear heads.

If the hijacker did not give up, then most likely he will use a "spider" - an ECU unit with a wiring harness that connects to the sensors and executive mechanisms fuel injection and ignition control systems. Therefore, you need to rearrange several wires in the connectors that go to the small harnesses that power the ignition coils or injectors. And these last flagella are not included in the “spider”: it is too long to join each candle and each nozzle.

And further

Finally - another good and inexpensive idea to implement, which works in cases where the car is protected by a simple immobilizer. Signal exchange between regular key and the immobilizer coil occurs once, before starting the engine. Therefore, one of the wires going to the coil can be cut and connected through a secret button or through the reed switch contacts. We seal the structure and fix it somewhere under the instrument panel. We press a secret button or bring a magnet to right place- and start the engine. Such blocking is useful when you do not want to take unwanted passengers on board: they say, the car will not start. And it will give you some head start if your keys were fished out of your pocket in your store.

AND IF EVERYTHING... One of the most reliable and at the same time affordable is the steering shaft lock of the Guarantor or Interception type. I advise you to put such locks on your own, if only because for better protection should be paid Special attention to the position of the steering shaft. Usually servicemen install the lock in a position in which the regular lock, - steering wheel while standing straight. Now look at how the bolts are located that secure the intermediate shaft crosses to the steering wheel and steering gear shafts. Most often they are facing you - this is done for ease of assembly. And, accordingly, it is most convenient to unscrew them for a burglar who will bring an intermediate shaft with him. Therefore, we install the lock so that when locking, the bolts are turned away from you: it will be most inconvenient for the hijacker to unscrew them. And the position of the steering wheel, at which it is installed, you will remember in a few days.

Everything you need to know about OSAGO, hull insurance and the work of insurance companies is in the selection of publications "Behind the wheel". You will find the most interesting articles about anti-theft technologies at.