The sequence of connecting the central lock to the alarm depends on its type: pneumatic, with constant or variable polarity. However, in order to correctly connect the central locking system using any of these schemes, you first need to prepare a lamp probe. To search for circuits on cars of recent years, it is better to use a voltmeter so as not to damage the wiring.
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Central locking device
A central lock is a complex of units with an electromechanical drive.
The central lock includes the following components:
- Control block;
- input sensors and buttons;
- actuators (activators).
Central locking components
The trunk lid and fuel filler flap can also be equipped with locking devices connected to the central locking system.
Control block
The control unit monitors the position of limit switches, control buttons, as well as contact groups of door locks and other sensors that are connected to the unit by wires.
Initially, the electronic part of the unit was contained in one housing with connectors. However, new car models also use CAN buses, with which you can divide the central locking control system into separate elements. This allows you to install them in different places on the body.
Example of a central locking control unit
Additionally, the BU may include:
- Sending a signal to the turn signals, which flash briefly when locked/unlocked. With this option, the alarm can be connected to the appropriate wires and the turn lights will be activated.
- Receiver of signals from the remote control. If this receiving device is located outside the unit, then the connecting wires can also be used to control the car alarm.
If the central locking system has a multifunctional complex control unit, then most of the wires of the installed security system are connected to its connectors. A siren, alarm sensors, and, if available, an engine blocking device will require separate connections.
Input sensors and buttons
The central locking system includes several groups of input sensors used in alarm installation:
These include:
- “Limit switches” are limit sensors of car doors that determine their closed or open position. The supply of light to the corresponding lights in the cabin depends on their signals.
- Door lock microswitches. They signal the closed/open state of the car door lock.
- Microswitches in the electric lock drive. They send signals about the status of door locking devices - locked/unlocked.
The control button in the cabin can be one on the driver's door or on the panel, or two on both front doors. The central locking is usually controlled using a two-way button with three contacts - one common and two normally open. There are also two- or five-pin keys.
Actuators
There are electromechanical drives and pneumatic drives for central locking actuators (activators).
In the design of central locks of modern cars, pneumatics are no longer used; electric drives are used everywhere.
Electric drive
There are several different types of electric drives with a traction force of 2.5 - 6 kg. The most common types are square and T-shaped (“pistol”).
The electric drive mechanism is housed in a plastic case. Structurally, it consists of an electric motor and a metal (or plastic) gearbox. When the polarity of the voltage supplied to the electric motor changes, the shaft rotates either clockwise or counterclockwise. Torque is transmitted to the gearbox, which converts rotational motion into linear motion. The direction of rotation determines whether the door lock is locked or unlocked.
The drives are controlled by short-term pulse voltage - lasting from 0.8 to 1.5 seconds. This is enough to trigger the lock mechanism to open or close. If the voltage supply time is made longer, the electric motors will fail.
Electric door lock circuit diagram
Among electric drives there are options with two electric motors. One is used to close/open the lock, the second blocks the mechanical drive of the locking device, preventing it from being opened from inside the car using a handle or rod. Such electric drives are controlled by three wires.
Electric motors differ in the presence or absence of a contact microswitch mechanically connected to the retractable rod. Two motor wires complemented by three switch cables form a five-wire electric drive.
They are usually installed in the front doors of the car, and a microswitch transmits signals to the two-wire motors found in the rear door locks. The corresponding commands (to close or open) are sent when the front doors are locked or unlocked with the key or when the control button is pressed.
Photo gallery: types of electric drives
Electric door opening/closing drive Electric trunk opening/closing
Pneumatic drive
The main design element of the pneumatic actuator is a rubberized membrane with a rod, placed in a plastic housing, which contains a fitting for air supply. Under pressure, the membrane rises, and under vacuum it lowers, moving the rod and locking or unlocking the lock.
Some pneumatic devices, like electric drives, are equipped with a contact microswitch. It is connected mechanically to the rod and works on the same principle as in electromechanics.
Some types of pneumatic actuators have electromagnets with a movable core (solenoids). They serve as additional protection and prevent unauthorized attempts to open the lock. If an effort is made to lift the rod without an enabling command from the control unit, the microswitch is activated and voltage is applied to the solenoid. The electromagnet core blocks the rod, at the same time a command is sent to the compressor to create a locking vacuum of air.
Operating principle of central locking
Locking and unlocking of car doors and other body elements is carried out by turning the key in one of the door locks or by pressing a button installed in the passenger compartment. Control signals are sent to the electronic unit, which issues commands to the drives to lock or unlock the doors, trunk and gas tank hatch.
Signals are transmitted by wire or contactless - when an impulse is sent from the remote control to the antenna and then to the control unit.
The central locking system also provides a function for automatically unlocking all locks if the vehicle is involved in an accident.
How to connect the alarm to the central locking system yourself?
To independently connect the central locking to the alarm system you need:
- experience working with auto electricians;
- set of tools;
- connection diagram (detailed instructions) taking into account the type of central locking installed on the car.
Preparing tools
The required set of tools for self-installation of an alarm system on a car should consist of:
- a set of Phillips and flat blade screwdrivers;
- wire cutters or scissors for cutting cables;
- set of wrenches;
- pliers or terminal crimping tool;
- knife or wire stripper;
- drill or screwdriver with a set of drills;
- soldering iron;
- network voltage meter;
- insulating tape.
Connection diagrams
The circuits under consideration are intended for car alarms equipped with built-in relays for controlling locks - they have three wires each for locking and unlocking.
The universal connection option looks like this.
Connection diagram of the alarm system to the central locking
Central locking is controlled by constant polarity
The alarm wires connected to the central locking can be power or signal. For power outputs use the following circuit:
The white cable connected to the alarm connector provides a signal for unlocking (UNLOCK), and the green cable provides a signal for locking (LOCK). The relay indicated in the diagram above is responsible for locking. Normally open contacts must be connected to the “minus”; common contacts must be connected to the signal wires of the central locking system.
During installation, please note that the wiring from the connectors of the electronic central locking unit is not cut off - both alarm cables (white and green) are simply connected to it. The security system wires do not have to be connected to the relay connectors; you can connect them to low-current signal terminals.
If the central locking system uses not negative, but combined polarity, then diodes should be installed when connecting (the arrow on them should be directed towards the alarm connector).
To connect to the central locking system with constant positive polarity, the same circuit is used, but with minor differences.
Normally open contacts in this type of central lock are connected to the positive pole, but not to ground. In the diagram, the upper relay gives the command to lock, the lower relay gives the command to unlock. In this option, instead of relay contacts, you can also consider using signal pins, but when installing diodes, the arrow should be directed in the opposite direction - to the central locking connectors.
Central locking controlled by variable polarity
When controlling central locking with variable polarity, the alarm is connected directly to the power wires.
Use a probe to determine the required cables:
- One contact is placed to the positive pole, and the other is looking for a wire, upon contact with which the light bulb of the device lights up. When a command to open or close is sent to the central lock, the probe lamp goes out.
- Then the first probe of the probe is moved from “plus” to “minus” and again sends a signal to the central locking. The device lamp should light up when opening or closing.
When two power wires that control the door lock actuators are found, you need to cut them to connect the alarm.
If the “signaling” has low-current positive/negative outputs, two additional relays are used when connecting
After this, you need to make a connection according to the following diagram:
- NO contacts are connected to the positive wire;
- NC contacts – to cables going to the electronic unit or to the central locking control button;
- O-contacts are connected to control wires going to the door lock drives;
- The alarm output cables are connected to the relay coils on either side.
The second side of the relay is connected depending on the polarity of the car alarm output:
- positive output – to “minus”;
- negative – to “plus”.
Central locking with pneumatics
In pneumatic (vacuum) versions of central locking control, instead of two wires, signals are transmitted one at a time. You can find the control cable in the luggage compartment near the compressor or under the rear seat. When the locks are unlocked, there will be a positive charge on it, and when locked, it will be negative.
Alarm connection diagram:
The required cable is determined by a probe - one probe of the device is set to “minus”, the other one checks the wiring, closing and opening the central lock. When unlocked, a positive charge is recorded on the control wire, and the device lamp lights up. Then the probe probe is moved to the “plus”, and the other is held on the same wire and when locked, a “minus” should appear.
The found cable is carefully cut and connected to the alarm contacts. To avoid confusion and damage to the electronics, you can apply first a positive, then a negative charge through the probe to the end going to the compressor. If everything is correct, the door locks will open and then close.
If the alarm system being installed has built-in power relays, then the connection is made as follows:
- at the unlocking relay, the NR contact is connected to the “plus”;
- NC contact - into a break in the wire directed to the central locking control button;
- O-contact – to the NC-contact of the locking relay;
- at the locking relay, the NR contact is connected to the “minus”;
- O-contact - into the break in the wire directed to the compressor.
Independently connecting the central lock to the alarm system has the following difficulties:
- If you do not have the skills to work with the electrical circuits of a car, it is easy to make an error in the installation, which can lead to a short circuit, failure of the central locking elements and the alarm system.
- Access to some parts of the central locking system and additional equipment may be difficult.
- For self-installation, simple security systems with a minimum set of sensors are more suitable.
- To connect complex car alarms (with a GSM module, starting turbocharged engines, car heaters, etc.), it is better to contact specialists.
- When installing an alarm system, it is advisable to avoid interfering with the central locking control units. Soldering into them should only be done as a last resort, making do, if possible, with installing relays, diodes and other elements. You can use special modules that allow you to connect and configure the security system via CAN buses.
Checking for correct installation
To check the installation is correct, perform the following steps:
- They connect the battery and give a command from the remote control to lock the central locking. To be on the safe side, leave one of the door windows open. This will allow you to open the car manually if for some reason the unlock command does not work.
- After locking the central locking system, a command is given from the remote control to unlock it.
- After correct execution of the commands, the wire connections are insulated with heat-shrinkable tubing or electrical tape.
If at any stage of the test the system does not receive a signal and operate, you should once again check that the wires are connected correctly. If they are connected correctly, there may be damage somewhere.
It takes two people to determine the malfunction - one will send signals from the remote control to lock and unlock the central locking system. At this time, another, using a tester, will check the voltage at the power outputs of the security system and at the fuse contacts. You also need to check the voltage at the contacts of the central locking button.
Video rules for checking the alarm connection
Filmed by the AUTOSECURITY channel - Anti-theft Studio.
Which is better: alarm or central locking?
The central lock has low anti-theft capabilities compared to the alarm system. An attacker can break the glass without much effort and relatively easily steal a car without a key by closing the ignition contacts.
Compared to a standard central locking system, a car alarm provides additional degrees of protection:
- The fact that an alarm system is installed, as indicated by a flashing LED beacon in the cabin, reduces the risk of burglary.
- Sound and light signals given when an unauthorized entry into the car is attempted attract attention and deter burglars.
- Modern security systems have an option (immobilizer). Even if someone breaks into the car and turns off the siren, it will be impossible to steal the car.
- Many alarms provide the car owner with information about the condition of the car, which is displayed using a feedback system on the key fob display. When attempting to break in, an alarm and a danger message will be sent to the remote control.
Installing a modern car alarm also makes car operation more comfortable. For example, you can use it to configure or turn on the pre-heater.
Progress does not stand still; new technical solutions and developments appear every day. In the world of automotive electronics, there are already a lot of instruments and devices that can make life easier for the driver.
On foreign cars, even older ones, you can find not only an alarm system with central locking, but also heated side mirrors, an electric sunroof, heated seats and other electronic gadgets. You can only dream about this in a Zhiguli, so in this article we will tell you how install central locking yourself on a VAZ 2101-2107, which will be controlled using an alarm system.
central locking- a central locking system that allows you to simultaneously close or open all the doors of the car. The system can be remote controlled and belongs to the category of vehicle auxiliary systems.
I would like to warn you right away that the article does not claim to be the best instructions or installation method. Personal experience is described here, so you always have the opportunity to do something better, more beautiful, more convenient, and so on.
What is required to install central locking on 2 doors?
- A working and installed car alarm system with power outputs for controlling door locks.
- Activators, actuators, actuators, solenoids, electric drives or, finally, just central locks - 2 pcs.
- The wires are two-core, copper. The diameter or cross-section of each wire must be at least 0.75 square. Length about 3-4 meters.
- Plastic clamps - 10 pieces, maybe more, "in reserve".
- Other: electrical tape, heat shrink tubing, wire cutters, screwdriver, soldering iron, solder, multimeter, drill, drill bits, electrical extension cord, etc.
Before we begin directly installing central locks, we will analyze each point above in order, in more detail.
1) In this article we will not talk about how to install an alarm yourself, but we will assume that it is already installed. The cheapest option (about 1300 rubles) - simple alarm no feedback.
Which model to choose, how to connect correctly, how much it costs and other questions about car alarms will be discussed in another article. Just a few important points to keep in mind.
Firstly, the main alarm unit must have a connector (usually 6-pin) with power outputs for connecting door locks. Secondly, before purchasing, decide in advance whether you need an additional alarm channel. It can be used to open the trunk or, for example, implement the “light path” function and other similar functions. It all depends on your imagination and ideas, so it’s up to you.
2)
Lock activators no matter how they call it, so don’t be surprised by so many names. We will stick to this term. The central locking solenoid most likely refers to an electromagnet, which is most often installed to open the trunk. In terms of power (traction force) it is much stronger than plastic activators, but it is also more expensive.
The approximate price for a regular central locking activator with 2 outputs (two-wire electric lock) is 100-120 rubles. a piece. For 2 doors you will need two activators, the total cost is about 250 rubles. The kit for each activator includes a special strip for attaching the central lock and self-tapping screws, as well as a rod, screws and a metal retaining plate.
3) To save electrical tape copper wires It is advisable to buy them in general insulation around the insulated conductors, but you can also buy them separately (single-core). The cross-section of the conductor must be at least 0.75 square. The current consumption of a conventional electric central locking drive can reach 5A at its peak.
In auto stores you can choose wires of various diameters, colors and lengths. Some are sold in ready-made installation kits or kits. Individually or “by meter,” most often, single (single) wires are found.
We recommend going to a regular electrical supply store and purchasing a two-conductor copper cable (the individual wire of which has a stranded conductor). For example, a PVS 2x0.75 cable (with a polyvinyl chloride sheath) or a PVS 2x1 mm cable is suitable. These wires are used to connect various electrical appliances, power tools and other machines and devices. The cost is about 12-15 rubles per 1 meter.
You can look for special automotive PGVA wires, which are intended for automotive equipment and instruments. They also have polyvinyl chloride insulation and are undoubtedly suitable for connecting central locks.
For reference: PGVA wires are designed for flexible connection of electrical equipment and devices with a low rated voltage (up to 48 V) in temperate, tropical and cold climates. PGVA wire is resistant to vibration loads, cracking, gasoline and oils. When laid alone, it does not spread fire.
When installing additional devices and using a second alarm channel, carefully study the table with permissible current loads. Most likely, to install a powerful solenoid that will open the trunk lock, an additional unloading relay will be required.
Plastic tape clamps will be needed to secure the wires. Purchase at will, 10 pieces will be enough.
A set of 100 pieces measuring 2.5x100 costs about 50 rubles.
5) Other tools, devices and materials that may be needed during installation.
Installation and connection of central locks
Installation of the central lock should begin by removing the door trims and other elements that may interfere with installation. Then holes are drilled in each door to install a metal strip on which the door lock activator will be attached.
Having secured and adjusted the plastic activator, we move on to connecting and laying the wires. The task is to bring the wires into the car interior and connect them to the alarm unit.
In order to avoid moisture getting on the wires and further failure of activators and other devices (power windows, door lights), consider laying the wires along the door in advance.
Avoid placing wires at the bottom of the door, as this is where water tends to accumulate.
When laying the wire, also pay attention to the most “problem” area, namely the place where the wires bend in the opening between the door and the body.
The best option is to use a rubber tube through the pipe. This corrugation will protect the wiring from chafing and kinks.
For a competent approach to the matter, as well as to be able to easily identify and find the necessary wires (+12 Volts, ground, control outputs from the alarm unit), it is better to remove the instrument panel (dashboard) completely. Thus, you will not only simplify your work on laying wires, but you will also be able to connect, solder and insulate them without much difficulty.
On a VAZ 2106 car, the instrument panel can be removed quite simply (four self-tapping screws and four nuts).
Twist or solder wires?
We recommend purchasing female and male terminals, as well as a special tool for crimping wires. If the activator fails, you can easily replace it with a new one. To do this, you just need to disconnect the terminals, dismantle the old one and connect a working activator.
Twisting the wires and wrapping them with electrical tape is not a reliable option, in this case it is better to “twist” + “soldering” + “heat-shrink tube”.
How to connect the central locking to the alarm system?
Since the VAZ 2101-2107 car is not initially equipped with a central locking or electric door lock drives, you can install additional electric drives and connect them to the system as follows.
The blue-white and orange wires of the 6-pin connector of the main unit of the alarm system are connected through 15A fuses to +12 V DC. Green and blue wires to the vehicle ground or, in other words, “ground”.
The white wire is to the blue door lock activator unlock wire, and the yellow wire is to the green power lock wire.
Most Chinese car alarms, especially inexpensive models (A.P.S. 2600 SHERIFF, Pantera CLK 355), have blocks similar in structure. Sometimes it seems that Chinese manufacturers only change the label, but the “filling” remains the same. At least, the 6-pin connector itself with power outputs for locks, as well as the colors of the wires, differ quite rarely.
Having familiarized yourself with the central locking connection diagram, feel free to start connecting the wires and checking the operation of the activators. After successful tests, all that remains is to assemble all the removed parts in place and then carry out a “control” check.
Job done, congratulations! The approximate cost is about 500 rubles, excluding the cost of alarm.
Conclusions, purchasing a central locking system with remote control and other useful information
In order to install a central lock that will close all doors when turning the key, you should purchase a separate central locking unit(small “black box”), as well as a special master activator (5 pins) for the driver’s door, or also for the front passenger door (where there is a lock cylinder and the ability to open the door with a key).
In this case, there is no need to install an alarm, and the process of installing and connecting the actuators is similar to the example above. The only differences are that you will have to lay additional wires for the driver’s door electric lock, and also “figure out” the wiring diagram for the central locking control unit.
You can also buy a separate one central locking kit with remote control. This set already includes a central locking control unit, 4 activators, wires, fasteners and 2 key fobs. A universal kit will cost about 1000 rubles.
Where can I buy? You will not find such a kit in retail stores at the price mentioned above. To do this, use sites that sell electronics and other devices directly from China. Try not to deal with intermediaries, but order directly.
The site is entirely in English, so if you do not speak it well, use Google Translator or another similar one to translate into Russian.
If you have any questions about installing central locking, or would like to learn more about how to buy on this or similar sites, write to us using the “contact” form (at the bottom of the page). We will try to answer.
The presence of central locking in a car significantly increases the level of comfort. The vast majority of modern cars are equipped with a similar function. The rest of the drivers have . Let's look at how to connect the central locking, as well as installing a simple remote control.
The fundamental difference between the main types of central locking
Fundamentally, devices for automatic unlocking/locking of door locks can be divided into 2 types:
- Central locking with electric drive. Electric activators are installed in the doors. Each mechanism can have an individual control unit or be controlled by a single unit (this is the scheme used on budget cars);
- pneumatic central locking. The activator rod moves due to changes in air pressure inside the line. At the moment, the system is outdated and not used; in the past, such systems were installed by Mercedes, BMW, VW, Audi. It is not economically feasible to restore such a system or install it yourself. It is much easier to install electrical activators by connecting everything to a unit with a remote control function.
We will consider central locking with electric drives. Devices of this type are divided into 2 types:
- with positive potential control;
- with negative potential control.
What a control signal is and why it is needed will become clear to you when we look at the operating principle of the simplest central locking system. As an example, let's take the most common scheme on budget cars with minus control. The schematic diagram is taken from the Opel Astra F repair and operation manual.
How does the simplest central locking work?
You can immediately see that a 5-wire activator is installed in the driver's door. Some car manufacturers, wanting to save money, do not install a control servo in the driver's door, but only a button.
What we see in the diagram:
- S41 – limit switch located at the driver's door lock cylinder. When turning the key to unlock or lock, a negative potential is briefly (about 1 second) applied to the central locking unit.
- S42 – passenger front door switch.
- M18, M19, M20, M32 – door activators. M41 – gas tank flap lock, M60 – trunk servo drive; To operate servos, 2 wires are enough, which are called power wires. The potential difference on these wires starts the motor, which moves the lock rod. Depending on which wire has - and which has +, the motor will spin in one direction or the other. The third wire (blue-black) is required by the standard alarm system to monitor the status of the locks.
- K37 – central locking control unit. To operate, the block necessarily requires a constant + and mass. Two signal wires (white-brown and brown) come to the block from the passenger actuators. In idle mode they have little positive potential. The appearance of a minus on one of the wires provokes closing, and on the second - opening. It is this minus signal that determines whether the central locking is controlled by minus or plus. Depending on which wire - appears on, the unit supplies voltage of the required polarity to the power wires.
This is exactly how the simplest central locking works, which does not even react to whether the driver’s door is open or closed. The simplest central locking control unit works according to a circuit of two 5-wire relays. We invite you to watch a video that describes in detail the principle of operation and the method of connecting two-wire activators.
How to implement remote control
The remote control unit from Aliexpress, attractive for its low cost, has recently gained great popularity. Using a block of this type, you can connect a remote control to the standard system or equip a car with a central locking system yourself, having previously purchased 4 two-wire activators. Of course, there can be no talk of protecting the car from theft. Such a budget central locking control unit can only perform a service function. 
Pressing a button on the key fob replaces physically turning the key in the lock cylinder to unlock and lock the car. Receiving the signal, the control unit supplies voltage to the power wires. Only 6 wires are responsible for the operation of the unit and car locks:
- constant +, protected by a fuse (in our case – 15A);
- weight;
- 2 power wires going to the servos;
- 2 control wires.
The remaining wires are connected for light signaling, glass closers, etc.; You can separately power the opening of the trunk or the gas tank flap. 
The unit in question can be implemented not only into a standard system with minus or plus control, but also into a central locking system with a vacuum drive. The remote control unit comes with instructions that allow you to connect the system in parallel with the standard central locking unit. In this case, the functionality of the factory control unit is maintained. 
Connection
Central locking diagram for connecting universal two-wire actuators. 
The positive wire can be pulled directly from the battery, installing a 15A fuse as close to the battery as possible, or taken from a protected circuit in the fuse box. Current consumption depends on the power and number of central locking servos. We recommend reading how to calculate the fuse rating. The mass can be any bolt bolted to the car body.
If you have connected the wires, but when you press the “close” button the activators open the locks, swap the power wires (in our case, white and white-black).
A blue wire comes out of the central locking remote control unit for unlocking/closing the trunk, on which a “minus” appears when the key is pressed. You can connect the trunk using an additional 4-pin relay. How to connect the relay is clearly shown in the video. When connecting the brown wire, arming and disarming the vehicle will be accompanied by blinking of the parking lights or turning lights. The green wire is the control signal for finishing the glass. After closing the car doors, voltage is applied to it for about 30 seconds, which is enough to raise the windows even from the fully lowered position.
Pay careful attention to the connections and insulation of the wires. Do not proceed with the connection without understanding the electrical circuit and the principle of operation of the central locking system on your car. Improper installation of the central lock with your own hands carries the risk of a car fire. We hope the videos provided will help answer any remaining questions about installing a central locking system with remote control.
27.01.2017
The absence of a central lock in a car is not a problem; it turns out that you can easily mount and install it yourself.
This enterprise will not require significant expenses, but you need to have a certain sleight of hand and skill.
Central locking functions
The main characteristics of a car central lock can be called convenience and comfort, since it is enough to press a button on the control panel to unlock all the doors of the car.
Along with this, the central locking system opens and closes the trunk door, fuel tank lid and top hatch. If the car is equipped with electric windows, they can also be activated by pressing a button on the central locking remote control.
Principle of operation
The central locking (CL) consists of incoming sensors, a central locking control unit and an actuator (activator).
The central lock works according to the following principle:
From the switch, a message is sent to the electrical control unit, which forwards these messages to the central locking control unit.
- The door control units then activate the actuators.
Preliminary work
To install a central lock without the help of specialists, you need to purchase a mechanism and ensure that you have the necessary tools.
There are two types of central locks: mechanical, is activated by turning the key and electronic, activated by pressing the remote control button. If you connect the central locking system to the alarm system, you can also enhance the safety of the car.
To begin work on installing a central locking system, you need to have, in addition to the car, a centralized locking system consisting of a central locking control unit and an activator. You will also need wires for two cores and other auxiliary tools.
If the financial issue is not pressing, then you can purchase a universal kit at a specialized store, consisting of wires, controllers, cables, fasteners and other things.
The first stage of central locking installation
- Remove the door panels, but first disconnect the terminals from the battery.
- Consider an acceptable location for installing the central lock, paying attention to the location of the window regulators. In some cases, it is necessary to make special mounting brackets.
- Install central locking activators on each door, for which you need to make holes and secure them with self-tapping screws.
- Attach each activator to the door with clamps and align the stroke of the activator rod with the lock rod. From the first, install the fasteners on the rods of the manual lock block.
- Secure the wiring coming from each actuator with plastic clamps.
Second stage of central locking
- Remove the dashboard and make points near the front panel mounting points, which will simplify the task of laying cables. Since they will be laid through the place where the electrical cords are routed under the dashboard and in the glove compartment.
- Remove the previous cables for the electric window lifts, bring in new ones and connect them to the drive.
- Connect the wires of the actuator, wrap them with electrical tape and push them inside the door.
- In order to route the wires under the dashboard and into the glove compartment, some skill is required.
- Carefully install the pass-through pipe into the rack using a screwdriver.
- Next, the wires are connected to the connector and connected to the central locking power supply.
- The negative wire of the central locking system is connected to the car body, and the positive wire is connected to fuse No. 1 on the battery.
- Test the mechanical and electrical parts of the central lock in operation. As a result, the move should be smooth and easy.
- Restore the original appearance of the dashboard and side door trim.
The central locking system is not as indispensable as the windshield wipers, but it has rightfully earned its place among the necessary devices of a modern car. Central locking allows you to simultaneously unlock/lock the locks of all car doors (in some cases, also the gas tank flap). The system can have a remote control (RC) and be connected to an alarm system.
Classification
The fundamental difference between central door lock control systems lies in the method of signal distribution:
- management is carried out as a single unit (centralized);
- each door has separate control units that work in tandem with the central unit (decentralized).
Central locking is a component of not only the car’s comfort system, but also an important element of passive safety. A large number of related functions that began to be assigned to the centralized door unlocking system (for example, automatic opening of all doors in the event of an accident) led to the more frequent use of systems with decentralized control.
Systems in which all functionality is implemented by a single central locking control unit are used only in budget versions. Designers have also moved away from vacuum-controlled systems. The door servo drives were controlled using a vacuum lock. Inside the latter there is a compressor that creates a vacuum or pressure in the vacuum system (unlocking and closing, respectively). Mercedes and Volkswagen liked to install similar mechanisms on their cars. Any of these designs can have a remote control (RC).
Device
The design of a car's central lock assumes the presence of:
- servo drives (motors);
- main control unit (on cars with decentralized control of additional units for each door);
- input sensors.
Conventional DC electric motors are used as actuators. The servo drive design includes:
When current is supplied, the motor shaft rotates the gear through the gear. The latter moves the rod. Damper tips soften the impact when the rod reaches dead points. The boot protects the rod from moisture, dust and dirt (an irreplaceable component if the doors inside are treated with anti-corrosion agents.
The servo drive has only two positions: “on/off”. The rod can be attached either to rods (the prerogative of universal devices) or attached directly to the door locking mechanism. A limit switch can be located inside the actuator monoblock.
It is the limit switches in the car doors and microswitches that act as input sensors. They control the position of the locking mechanism. The corresponding signal about the position of the rod is sent to the main control unit.
To fix the current position of the elements of the locking mechanism (lock), microswitches are used. The shape of the cam mechanism, which is installed only in the driver's door of the car, determines the position for the microswitches to generate a signal. Understanding the state of the lock, they send two types of signals to the control unit: (Locked) “closed” and (Unlocked) “open”.
Separate microswitches are responsible for controlling the position of the lock “tongue”. In other words, for closing the door itself. When the door is open, the switch contacts are closed. Therefore, it is impossible to activate the central locking of the car. Engaging the “tongue” on the bolt changes the position of the contacts.
The central locking control unit is an integrated pulse distributor circuit.
Opel central locking unit disassembled
Principle of operation
Let's take a closer look at how a car's central locking works (including remote control):
- The lock position is “open”. Turning the key or the remote control signal sends an impulse to the control unit through microswitches;
- if all the conditions for closing are met (remember the microswitches that control the position of the door. Signals are transmitted between the central control unit (CCU) and the own blocks of all locking mechanisms of the car), the main unit transmits the “lock” signal to the corresponding controllers;
- activators receive an impulse to close the locks from their own control units;
Thus, almost simultaneous closing of all doors occurs (gas tank flap and trunk, if they are connected to the central locking system).
Central locking with remote control is becoming increasingly popular. Pressing the corresponding buttons on the key fob or ignition key with remote control provokes a signal picked up by the receiving antenna of the central control unit. This, in turn, generates signals: open/close for all connected activators.
Using a remote control allows you to synchronize the central locking with the car's security system. The anti-theft system will automatically lock all car doors. Additionally, you can connect automatic window closers, which will make operating the car even more comfortable.
Scheme
Possible connection diagram options: 
DIY installation
Installing a central locking system will take place without any particular difficulties if your car in more expensive trim levels was equipped with central locking from the factory. Then you only need to buy a factory kit: a block, activators and a corresponding wiring harness with connectors. There is no need to “collectively farm” the seats for all the mechanisms.
If you want to save money, or there are no ready-made solutions for your car, you can purchase a universal kit. This will include:
- servos;
- controller;
- wiring harness;
- fasteners.
On the market you can find both conventional systems and more expensive options with remote control.
Of course, to connect you will need a central locking circuit. You may have to drill holes for the seats. In general, installing a central lock with your own hands will not be possible without a flight of technical imagination.
Installation sequence:
Before connecting the central lock at home, carefully study the electrical circuit diagram. Without a clear understanding of the pinout and how to control the activators, it is better not to undertake installation yourself. Many modern cars are equipped with VSM. Body Control Modul is a block that controls the operation of all electrical appliances. Which can complicate the connection of the central locking with remote control and its synchronization with the rest of the electronic systems of the car.
