Understanding VW T4 Central Locking System: Reading Wiring Diagrams & Actuator Connections

Hi, I have a switchboard installed in my Transporter, but there is a big mess in the cables and I have to clean it up. I would like to understand how the central locking system works with such a precise central unit.

Generally, the car has MASTER (4 pins) and SLAVE (3 pins) actuators

Currently this switchboard is installed there: http://bowi.com.pl/instrukcje/BX40.pdf and the target one may be this one: https://www.proxima.pl/wp-content/uploads/2017/02/Instruction -sterownik-of-immobilizer-SI.pdf

Basically, I would like to learn how to read and understand these diagrams.

I have a question about the pattern of this proxima. I have 6 cables at the top: 3 close and 3 open. How should I understand this combination of these triples in the central unit itself? Does it mean that white is OR to orange or yellow and should I choose one of them?

The second thing concerns the installation in the car itself. I connect the control unit to control the master - if I control the master, the rest will close. Well, I think I need to find out which cables are responsible for closing and which for opening the actuator? Like what I will find, i.e. for example, that a given cable after shorting to ground - this is probably how it works - closes / opens the actuator, it has to schematic connections on the switchboard?

And the third question. There are several connection systems on the BX40 diagram, including plus / minus control. How do I know which one is right for me?


Thanks in advance for your answers. I will be very grateful because I have been looking for information on the Internet for a long time and I could not find comprehensive answers.

PS One more thing occurred to me. Many of these control panels have a closed windows giving weight for, for example, 25 seconds. I don't understand one thing. It seemed to me that it should be used by connecting it directly to the window cylinders. Then they will close for 25 seconds. If so, why do I need a comfort module?

I suggest you commission this piece of work to a professional. You'll get better at this.

Moderated By CameR:

Reg. 3.1.11. Do not send messages that add nothing to the discussion, do not solve the user's problem.

Forgive me but that is not the answer to my question. I want to understand how it works. Believe me, if I understand the principle of action, I will manage. If you don't want to help me, I'll wait for others.

Regards.

With all due respect, there is nothing to understand. Schemes are available and unchanged for some years there. Regards.

Moderated By CameR:

Reg. 3.1.11. Do not send messages that add nothing to the discussion, do not solve the user's problem.

Schematics need to be able to read. So hard to understand what I mean? Anyway it does not matter. You don't want to help - don't help. I will not prove anything to you. I just don't know what the purpose of your answer is then

Buddy, connect a meter with a squeaking signal and connect the switchboard to the power supply. Take the remote control and test, and you'll understand soon. Why ask Isn't it better to check it yourself?

The first basic question about the car in the factory is central or added from the description concludes that it is added. These 6 cables in Proxima are the same as in this BX40, but Proxima has not included the configuration scheme, but you can check it on the Bx40 scheme and they are used to choose the central control method. There are 4 ways to control the central "+", "-", directly with servomotors and central pneumatic control. And how do you know what the way is? You must first determine the central or electric or pneumatic type. If the electric what is needed, the "+" or "-" given on the signal cable closes or opens the locks (this is the configuration for the factory locks or if an additional actuator controller is present). If the central top-up and the control unit directly controls the servomotors, this option is also there. Do not be interested in how the switchboard works, it only stopped, what type of central you have and what you need for testing, then you look at the diagram of this configuration, you connect cables and that's it.

norbert.s. wrote:

piotrekwoj1 wrote:

whether added from the description concludes that it is added.

And I conclude that the original, guess why?

piotrekwoj1 wrote:

And how do you know what the way is? You must first determine the central or electric or pneumatic type.

Have you ever seen the teller pneumatic lock in T4?

If you didn't notice, you wanted to learn something and not get a ready solution. He is to define it not you or me. Until now, there was no one willing to explain anything to him.

If the Author would write in the beginners section, it would be explained.

Can you describe these cylinders more accurately?
Some of these wires are little for the master and too many for the slave
The basic question is whether there is a factory central lock because it depends on how the wires from the relays will be connected.
In Proxima these cables are poorly described.
It is not about the fact that these wires are to be opened, only that this relay works when you press open on the remote control and the second relay closes as you press, i.e. when closing only the upper relay from the diagram works and when opening the lower one.
As someone else wrote above, both control panels have the same described cables from the relays, but Proxim does not have it outlined.
So see the diagrams from Bowi.
Fig1 is an internal diagram and Fig4 is the actuator connection in this place.
The relay has a COM working contact which can be connected to the NC contact (i.e. when the relay is not powered, these contacts are shorted together and when powered, these contacts are open) or with a NO contact (this contact is open when the relay is not powered and when the power appears on it, it closes COM with NO).
It can be seen now that in Fig4 the servomotor has the mass given for both wires at the moment because white with orange and black and white with orange are attached and orange and orange and black are connected to the ground.
If you press the open button now, the OPEN relay, i.e. the one below, will work, it will give a plus from the yellow-black to white-black wire and the actuator will extend.
If you press close, the CLOSE relay, i.e. the one at the top, will work, it will short-circuit the white and yellow wire, i.e. it will give ground from yellow to white, so the actuator will have power and will pull in.
I hope I described it quite simply.
If you understand this, you'll understand how the Fig2 or Fig3 scheme works.

By pressing the button you control only one relay and this gives the appropriate signal depending on which diagram you have chosen - Fig2, Fig3 or Fig4.