Car alarms perform the function of notifying the owner vehicle about the penetration of unauthorized persons into the interior of the car. They are different types, many manufacturers produce security systems for cars.
If the owner of the car found the right security system for himself and brought it to his home, this means that the system needs to be installed.
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The motorist can trust professionals or his loved ones in this matter. But this is not particularly necessary, because instructions for installing an alarm are always included with the security device.
What a vehicle owner needs to know about alarms
Models of security and automotive systems different brands and species differ from each other not only in terms of appearance and configurations.
Each installation can have its own diagram, using which the owner of the car can place all parts of the alarm system in in the right order.
The pitfalls of this process can be hidden not only in the diagrams, but also in the following indicators:
- in different alarm systems, wires of the same color can perform different functions that will not be identical;
- Some types of alarms require more effort in terms of installation on the part of the car owner, because they may have additional elements responsible for various functions of the system;
- The connection diagram of the alarm system itself may not be suitable for a certain type of car - you should choose a security system for a specific car model.
If a person has taken into account all the features of his vehicle, considered a number of possible complications for the installation work and realized that he can do it, installing an alarm with his own hands will not be a problem for him.
Preparing tools for installation work
To quickly, correctly, and efficiently install an alarm system on your own car, you need to stock up on endurance and strength, and also prepare the following tools:
Having prepared an alarm with an autostart function for installation, the car owner can install the alarm on the car in a few hours. It is advisable to have at hand not only necessary tools, and also a diagram that will help you do everything correctly.
Installing a car security system yourself - where the connection is made
Car security systems with auto start work on the same principle and their installation scheme is the same. The alarm connection points on the car are as follows:
- Free cavities that are located behind the dashboard.
- Parking brake department.
- Places for locking and unlocking doors.
- Stator and turn signals.
- Near the door and trunk opening sensors.
- Near the brake pedal and parking brake.
The owner of the car can find all these points for alarms with auto start using the indicators of the UCH module or looking behind the instrument panel. The alarm connection points in cars of most brands are located in approximately the same places. 
Carrying out the process of installing a security system yourself
Having chosen a car alarm with auto start and feedback, a person must take care of it correct installation. The general algorithm of actions, which involves installing a car alarm with feedback and an auto-start function, is as follows:
- The instrument and steering panels are removed;
- the lower steering column pad is carefully removed;
- the alarm system unit is installed in a hidden location;
- wires are laid, protected and extended;
- a shock sensor and siren are installed in the luggage compartment;
- connect the wires of the required colors, according to what the diagram shows, to special points on the machine;
- The alarm wires are connected to the machine's power system.
- The functionality is checked using auto-start of the alarm with feedback.
Installing an alarm on a car yourself requires a lot of effort and time on the part of its owner. The installation diagram helps to carry out each process correctly, step by step.
It will be easy to install an alarm on your car yourself if you use the instructions for the security system. 
Additional facts to remember when installing an alarm system with auto start
Alarms for cars with auto start and feedback require special attention during installation. Every owner who wants to protect his car from theft by installing a powerful car alarm should know that its proper operation depends on the installation method. In addition to what is stated in the instructions, a person must be guided by the following rules:
Maps for installing car alarms are included in the instructions for the device. If it is easier for the car owner to use their Internet schemes, that too good decision. Each driver will be able to independently install alarms with auto-start and feedback functions. To protect his car, he needs the security system itself, a diagram for its installation and a set of tools. Check functions feedback and autostart is necessary immediately after mounting the system. Three beeps – the installation was unsuccessful. If there is only one signal everything is fine.
Self-installation security system for a car with auto start and feedback it is possible, but for this you need to be patient and do everything according to the rules.
If you are the owner of an expensive car, then most of all this article is not for you. And if you have a rather modest car and you want minimal costs(which is not at all proportional to the quality) protect your car - then this description is for you.
The fact is that car alarm should not cost more than 5% of it market value, which for a used car is an amount for which you cannot buy a ready-made, more or less reliable alarm system. The danger for a car without an alarm system lies not only in its theft, but also in the entry into the interior itself, the theft of property, documents, etc., which is very common in current conditions.
The damage may be minor or may exceed the value of the vehicle itself. In the traffic police, such cases are often not considered at all, since there is little evidence for them and the case is not opened at all, stating that you yourself forgot your purse or documents somewhere, and you had no money at all. My friends had several similar cases, although the cars were equipped with commercial alarms.
But the fact is that scammers and thieves have long learned to bypass standard alarm systems that are not expensive (although this is for some), and quite expensive. And it has become much easier to open (steal or rob) a car equipped with such a standard purchased alarm system. Now there are many different scanners with which an attacker can read your alarm code when you arm your car by sending a command via radio from the key fob.
That’s it, the “bad person” already has your code and can easily both open and close the car without attracting attention at all. Further, I think everything is clear to everyone. Therefore, having such an alarm system, you significantly increase the potential theft or theft from the car, even compared to if you simply locked it with a key, without the possibility of remotely opening the doors. And if you also take into account the human factor - the technician who installs the alarm system for you can naturally know how to turn it off, make a duplicate, etc.
Of course, most masters are decent people, but the facts show that if there is an opportunity, someone will always take advantage of it. The data can be transferred to interested parties and “shot” a year or two after the alarm is installed. It will be almost impossible to connect this into one whole, and even more so to prove it.
There are still many arguments not in favor of standard low- and middle-class purchased car alarms, not to mention the costly part.
Let's look at the functions that a simple, inexpensive, DIY car alarm should perform:
- The alarm must respond to intrusion into the car, for example using an IR motion sensor, or from standard light buttons that are triggered when the door or trunk is opened (most cheap option, simple to implement, but nevertheless quite functional).
- A car alarm should notify you of intrusion using sound, a standard signal or an additional siren. This alert should last for a certain amount of time, such as two to five minutes, and then automatically turn off.
- After the alarm is triggered, the system should go into unauthorized entry mode - trigger repeatedly, block the engine from starting, etc.
- - The car alarm must consume low current, excluding the discharge of the battery (standard or additional) during long-term parking of the car under guard.
- Switching mechanism, switching to security mode and disabling the alarm. In a simple case, a short delay (5-10s) after turning on the secret toggle switch, while leaving the car and closing the door.
- Easy to manufacture and connect with low financial costs and maximum efficiency.
Such an alarm will reliably protect even such a product as the Six-wheeled "Cossack Hummer"
Below is one of the most simple car alarm circuits that you can make yourself.
The car alarm combines an acoustic alarm that is triggered by the closure of sensors (door and trunk light buttons) and when the ignition is turned on and blocks the engine from starting.
This circuit is suitable for installation on domestic cars equipped with a classic contact ignition system (VAZ, Moskvich, Volga, etc.) and any foreign cars with a similar contact ignition system. (Previously, all cars had a contact ignition system - turn the key - the contacts closed). Installation in many new cars is also possible.
Homemade car alarm circuit is quite simple and understandable to any novice radio amateur. All details are publicly available and cost pennies. The connection to the car's electrical circuit is also shown in the diagram. The bold line highlights the alarm unit itself, which is assembled in a small plastic case, selected from those available or can be purchased on the radio market - to suit your taste.
Everything outside the bold rectangle is the electrical equipment elements of your car, as well as other additional elements that are introduced into the car circuit (Sensors K2 and KZ, two relays P1 and P2, toggle switch 51).
Two types of contact sensors are used - standard interior lighting switches located in the car doors (they are connected in parallel, so the diagram shows one sensor K1 and one lighting lamp H1), and specially installed sensors(such as door ones) under the hood and trunk lid, if the trunk is not equipped with a standard switch similar to the door ones - so that when closed their buttons are pressed and the contacts are open. When opened, the contacts must close.
As a source sound signal Car alarm systems can use the standard signal of your favorite car or an installed purchased siren. The signal is turned on using an additional electromagnetic relay of sufficient power (since a fair amount of current passes through the signal coil), which must be installed in the engine compartment of the car - P1. The same relay P2 is used to block the ignition system. In principle, this relay can be placed in the alarm box itself. Its winding is connected in parallel with winding P1 and when the alarm is triggered, relay P2 with its contacts bypasses capacitor C of the ignition system, which makes it impossible to spark and start the engine.
The car alarm is turned on using microswitch 51, which must be installed in a “secret place” inside the car (usually somewhere under the panel), known only to you and trusted persons. After turning on the power, the device will not respond to the status of all sensors for 15-20 seconds. This time is allotted for getting out of the car and closing the doors. After this time, the car alarm goes into security mode.
To increase reliability, you can use an independent additional small battery, depending on your desire, desire and financial capabilities.
Even without an independent power source, such an alarm system modern conditions It will be more reliable than a simple store-bought one with a remote control. It’s clear about the cost.
The system is economical. In standby mode it consumes less than 0.7 mA, the trigger mode is 1.1 mA, and the signal or siren current is 0.2-0.5 A
You can also add infrared sensor movement - purchased or if you have one lying around on the farm.
If the sensor is rated at 220V, it needs to be converted to 12V (8-20 Volts). A standard household motion sensor needs to be opened. The spherical part is removed by bending one support. The halves are secured with latches.
Take out the board. A sensor is a passive IR receiver that responds to changes in IR radiation hitting it. Typically, the viewing angle of the motion sensor is 180 degrees.
Another one simple circuit car alarm without chips
The circuit works on a similar principle, using the same sensors as in the previous case
Short description:
SA2-SAn - intrusion sensors (door buttons, etc.). Diodes VD5-VDn are used to decouple the sensors, if they are used for other purposes. If the sensors are only for signaling, diodes can be excluded.
The supply voltage supplied from any closed sensor is supplied to VD1 through R1 C1. Circuit R1 C1 creates a short pulse of current even if the sensor remains closed. Capacitor C2 prevents the alarm from going off when toggle switch SA1 is turned off.
The output switch and multivibrator are assembled on elements C4, R4, R5, VT2, K1. The duration of K1 being in the on position is determined by the selection of resistor R5 (you can install a variable resistor), and in the off position - R4. The overall pulse frequency is set by C4. This part of the circuit requires more careful configuration. Approximately around 2 Hz.
An assembly is assembled on elements C3, VD3, VD4, which forms a delay in alarm activation when the intrusion sensor is closed. This is necessary to delay the activation of the siren when the owner opens the car for 4-8 seconds to turn off the device (so as not to scare others :-)). The delay duration is set by capacitor C3. The discharge of the capacitor when the power is turned off is provided by resistor R3.
In this scheme there is no node that would turn off the alarm after a while; this is the simplest option. If desired, such a unit can be modified, slightly complicating the design, or you can use an autonomous time relay with periodic reset.
VD1 - any low-power thyristor, for example KU101. You just need to select C1 (increase if the alarm does not trigger when the sensor is closed), R2 (decrease if it does not trigger) and C2 (increase if it triggers immediately when the circuit power is turned on). Diodes - any low-power ones. Relay K1 - RES55A, or similar (selected according to the power of the switched current of the siren signal). If you use a more powerful relay (more than 1A), then you will need to significantly increase the capacitance of capacitors C3 and C4 (this will entail an increase in the size of the device). Therefore, if you have a fairly powerful load, it is better to connect a powerful relay to the RES55A output. Transistors can also be any, with the appropriate transition structure, and VT2 must withstand the relay switching current. SA1 - any small-sized switch (toggle switch).
To arm the car alarm:
1. Turn on toggle switch SA1 with the sensor closed (with open door). The circuit will not turn on in this position and can remain indefinitely.
2. Close the door - the circuit goes into security mode.
To turn off the car alarm:
1. Open the door (this will close the intrusion sensor).
2. Quickly, within 8-10 seconds. disarm - turn off toggle switch SA1.
Car alarm connection:
The modern realities of our lives make installing a car alarm one of the most current problems. First of all, it is ensured reliable protection car from attempted burglary and theft. Currently, car enthusiasts are offered the most wide choose alarms. And then the question of how to connect the alarm to a specific car comes to the fore. However, first of all, it is necessary to consider the main types of these devices and make the right choice.
Types of modern alarms
Any car alarm can perform several basic functions. All of them, in one form or another, are present in every design. First of all, these devices must respond to all actions towards the car that are illegal. Many of them can block the engine, preventing unauthorized start attempts. In such cases, good alarm attracts not only the attention of the car owner, but also the people around him.
Based on functionality, modern alarm systems are divided into the following types:
- Alarm without feedback. This design represents a budget option and is installed mainly on inexpensive cars. The radio channel is considered the most vulnerable point. This car alarm is not capable of protecting the car from experienced car thieves, however, it may well scare away petty thieves.
- Alarm with feedback function. Compared to the first option, it is capable of solving much large quantity tasks. That is why it is so popular among drivers. With the help of feedback, the car owner remotely receives information about his car, which is sent to a special key fob. In addition to security functions, it is possible to remotely start the engine. You just need to disable the mobilizer installed at the factory. In urban conditions, the range of such an alarm is up to 1 km.
- Usage GSM alarms with GPS module. These devices are becoming increasingly popular due to the ability to control the car via mobile phone. Thus, you can track your car from anywhere, provided the network of the service operator is covered. All information is transmitted in both directions via SMS. Some operators provide a service that makes it possible to track the position of a vehicle linked to a map via the Internet. With this service it will be much easier to find a stolen car.
- Satellite signaling belongs to the area high technology. The level of protection allows it to be used in expensive cars. All information is transmitted via communication satellites. This is the most reliable and expensive type of car alarm.
Wide choose electronic devices allows you to choose the most suitable option car alarm system, which includes all the necessary functions. After purchasing, you can install it. To solve this problem, there are two ways: contact a car service center, an experienced auto electrician, or try to install an alarm on your car yourself.
Rules and procedure for installing alarms
If you do not have knowledge of electrical engineering, you should not try to install the alarm yourself. These devices are quite complex and require special knowledge and skills to operate them. After all, the electrical circuit of the alarm system will be combined with the electrical network of the car at many points. The slightest inaccuracy in installation can lead to failure of various relays, blocks and other elements.
Exists certain order installation instructions that must be followed. First of all, the places where the main alarm elements will be installed are determined. Typically, an electronic control unit, sensors, antenna, light and sound signals are used for this. A mistake many car owners make is trying to make design changes to a circuit or connection at random. individual elements. At best, such equipment simply will not work.
The main connection point for the alarm is the control unit, in which all the wires are concentrated. This greatly simplifies the connection. In addition, the unit is located under the instrument panel, in hard to reach place. After determining the connection locations, you can proceed to the actual installation of the device.
Alarm connection procedure:
- Installation of sensors in places recommended by the manufacturer.
- Installing a sound siren under the hood of a car.
- Sensors, sound alarms, light sources are connected to the control unit in accordance with the diagram.
- At the end of installation, the unit is connected to the power source.
As a rule, this procedure does not cause any particular difficulties. You just need to carefully understand the connection diagram supplied with the equipment. There are certain connection difficulties with central locking. In such cases, you have to individually understand the circuitry of each car.
Connecting an alarm to a car with central locking
Most modern cars are equipped with central locking. Along with a security alarm, it also performs protective functions. Therefore, these individual systems must work in harmony, and this depends on correct installation.
The main function of the central locking system is to open and close the locks located on the doors, trunk, hood and fuel filler flap. When the driver's door closes, other body elements are locked at the same time. To control the central locking, there is a button installed in the cabin and a key fob with a remote control. Considering the features of both devices, it should be remembered that the car alarm and central locking circuits must be compatible with each other, and their operation must occur synchronously.
After installing the alarm, additional useful functions appear in the car:
- Automatic closing of the sunroof and lowered door windows.
- Upon command from the control panel, you can remotely start and warm up the engine.
- Create a simulation of an engine breakdown so that the thief lingers in the cabin.
- Complete blocking of engine starting.
- Driving a car using SMS messages.
In some cases, the installation of a car alarm is carried out simultaneously with the central locking. This makes it possible to immediately combine electrical circuits both devices.
DIY alarm installation rules
In some cases, mainly in the absence service centers, car owners try to install the alarm themselves. This matter is not at all hopeless. You just need to follow the basic rules for installing such devices:
- All connections of wires to each other and to device elements are made through terminals or by soldering. All connections must be carefully insulated.
- The wiring is carried out hidden, under the interior trim. Special attention you need to pay attention to the transitions between body elements.
- During the connection process, the colors of the wires must be observed in the same way as in the attached diagram.
- During work, the battery must be completely disconnected.
Connecting the alarm system to the central locking is enough difficult process, which is usually performed at car services. But if desired this operation You can do it yourself.
Connecting an alarm system to the central locking - the main difficulties of the procedure
Nowadays, motorists have the opportunity to choose any type of security system for their vehicle, focusing on their own needs and wishes.
But choosing the “best” alarm system is half the battle. It still needs to be properly mounted and connected to the central locking.
Specific connection points security device are selected depending on the following factors:
- type of purchased alarm (without remote control or with one);
- model of the vehicle on which the system is planned to be installed;
- location of the main security mechanism (block).
Before starting work, you need to decide on the type (CL) of your car. The most common types of central locks are:
- driven by positive impulse;
- controlled by negative impulse;
- with variable polarity.
Connecting an alarm to the central locking system with a negative and positive pulse
IN in this case when a minus is applied to a pair of lock wires, they close or open. Finding such wires is relatively easy using a probe (lamp). You should alternately close the wiring that comes out of the car doors on the driver’s side. As soon as found the right pair wires (the door opens or closes), the problem can be considered solved.
In those cases where it was not possible to find the wires, you will have to “dig” into the central locking unit. You will need to find a special relay in it that is responsible for closing/opening the doors, and then solder the security system wiring into it.
Working with a lock controlled by a “plus” pulse is similar to the scheme described above. Only the required pair of wires in this case, as you yourself understand, will have a plus polarity. In other words, positive wires should come from the alarm.
The connection diagrams for the voiced types of central locking with a built-in relay will therefore be as follows:
- “Negative” pulse: NC (normally closed) contacts are not needed, NR (normally open) contacts are connected to the “minus”, common contacts go to the control wires.
- “Positive” impulse: open contacts are connected to positive, closed contacts are not used, common ones, as in the previous version, are connected to the found control wiring.
Features of connecting the system to a lock with variable polarity
In this case, the car alarm must be connected directly to the car's power wires, which are again looked for with a probe. First, use it to find the negative power wire (the device should be connected to the positive, and then press the corresponding button on the alarm, determining the required wire). They look for another wire (power) in the same way.
In this article we will tell you how to install a car alarm in any car with a step-by-step guide.
Car alarm - effective method insure your investment and give you peace of mind. While many cars come standard with some kind of alarm system, some do not. It's no surprise that many people want to install an alarm system, either because they don't have one or because they think they need to upgrade the system. Installing a car alarm may seem challenging task, but with a little preparation and information it turns into a series of small tasks.
Planning your installation
Develop an installation plan. Planning ahead can reduce installation time. Specifically, gather documents and manuals that describe your vehicle's wiring colors, locations, and polarities.
Check each of your doors
You want to make sure that they trigger the "door ajar" light on the dashboard. If a door fails, the alarm will not sound when that door is forced.
- Most alarms come with additional contact switches that trigger the alarm when the door is opened. This may be a good alternative if your doors don't cause light to flicker when opened.
Alarm connection diagrams
Write down which panels will need to be removed and what tools you will need to remove them. Study the wiring diagram of your car and draw a plan where you will connect the car alarm.
Car alarm installation
Remove the necessary panels. This will allow you to access the wires needed to connect your car alarm. This will also give you access to areas under the dashboard where you can install an alarm. Typically, this will include panels near the center of the dashboard on the driver's side. They are often located near the floor or under the steering wheel. These panels will be different for each vehicle, but you can consult your vehicle's service manual to find the correct panels.
Install a car alarm
Try installing a car alarm in a hidden place. Some people will mount it inside the dash if there is room, or under the seat. Just keep in mind that if the alarm is visible, a thief could disable it. The harder your alarm is to find, the more effective it will be. Install the mount using the screws and accessories included with the car alarm.
- Be sure to look at the other side of any surface before you pass the screw. You don't want to accidentally screw in wires or other parts.
Drilling protection in the car
You can avoid this step by running the wire from the car alarm to the siren through the existing hole in the guard. It often helps to run the wire near the heater core hoses, power amplifier wire, ignition power supply, or any other wire going to the other side of the guard. If not convenient location, you will have to drill a place for the wire. If you need to make a new hole, be sure to look at both sides of the guard to make sure the area you want to drill is safe.
Pass the wire through the protection
This wire will connect the car alarm to the siren.
- It is important that you insulate this wire with rubber gasket or fill the hole with silicon. This prevents the wire from being damaged by friction with the guard and short circuiting. You should also try to put the wire somewhere where you won't be able to touch it.
We install an alarm system
You can choose a place on the guard or somewhere else in the engine compartment where there is enough space. It is important to install the alarm face down to prevent water from accumulating in the voice coil.
Wiring connections
Start the valet switch. This will be the wire from the car alarm module. This switch will allow you to disable the siren functions. This will make it easier for mechanics when working on the machine.
Fire up the LED
The car alarm LED indicates when the alarm is on. This light is usually installed on the dashboard by drilling a small hole in the dashboard and running a wire to the car alarm module. The light is then attached to the dashboard using super glue to hold it in place. Be sure to look at both sides of the dashboard and make sure your drill won't hit other parts.
Install an external antenna
If you have an external antenna, it extends the range of your wireless remote control remote control, receiving a signal from outside the car and transmitting it to the car alarm module. Most external antennas are glass mount antennas. This means that you will install the receiver on outside your glass and repeater on inside the same glass. The signal will be transmitted through the glass without the need for drilling holes and repeater wires directly to the antenna wire of your alarm module.
Connect the siren
The siren must have two wires, one negative and one positive. Most car alarms produce a positive siren, so connect the alarm box to the positive wire of the siren and connect the other wire of the siren to ground.
Connect alarm sensors
The sensors are responsible for signaling that something is wrong and the siren should sound. You'll connect the sensor wires from your car alarm to the wires that signal your door ajar or dome light. You can also connect them to the trunk and hood sensors and the ignition switch, depending on the features available in your security system.
Connect the power wire
You must connect the power wire of your alarm module to a test or other source direct current. This will ensure that the alarm sounds even when the vehicle is turned off. Your alarm is now turned on and active.
Reinstall the panels on your car
Be sure to replace them in the correct order so that all panels line up correctly. It is also recommended that you consult your service manual for this step.
