central locking wiring issue

I'm confused with the central locking wiring. Can someone look in the diagram at the highlighted 2 wires (BROWN / white and White) and tell me what are they supposed to do? When I check voltage both of them are showing about 5.24V and doesn't change voltage during locking/unlocking via key remote. In the manual it is said that "window closer will output 30 seconds". I was expecting that those 2 wires are responsible for windows closing but seems it's not.

This is the second time in 3 weeks I've seen this "Central Locking System" diagram with these same wire colors. You're in Latvia, the other guy was in Pakistan. I suspect this equipment is not something we have here in the states, so it isn't familiar to the regulars here. The Pakistani Guy didn't get any responses to his question.

I'll take a stab and GUESS that the brn/wht and wht wires are negative triggers for lock and unlock. 5.4V is 'logic level' and most likely a trigger if put to ground. Try grounding the wires one at a time, and see if the wires trigger lock and unlock. It shouldn't hurt anything to try. If you figure it out, please post back. That's how we learn.

Good Luck.

"shouldnt hurt"? thats kind of messed up to suggest this without explaining the consequences if it does hurt...

just tapping something to ground that is already showing some level of voltage could short out any circuit board associated with that wire. causing hundreds if not thousands in damage.

the best way you can go about this would be to post all of the information and a detailed description of what you are trying to do. make, model, year of the car, trim level, everything. the more information you can post, the better your chances of getting the right answer.

the diagram seems to show in one picture the wiring possibilities of interfacing with the factory locks and the wiring of any aftermarket locks or just wiring straight to the factory lock motors which isnt usually necessary. maybe this is where the confusion is happening.

I was suggesting trying the wires by themselves to ground. The "shouldn't hurt" would be applied to damage to the module. I don't know what these modules cost in Latvia, but I doubt it's the equivalent of "thousands of dollars". If the documentation with this device is so lacking, it probably isn't made of spacecraft-quality components.

He said the wires are indicating 5.3 Volt. My experience has shown that a negative trigger (logic) input will rest at ~5V. The input is held high through a pull-up resistor. Shunting a logic input to ground is how they work.

I don't have any more information and documentation about this circuit or device than anyone else, including the OP. Sometimes all one has is an 'educated guess'. I took mine. If the OP wants to try it, fine. Or reject it, that's fine too.

This is some unbranded car alarm I purchased from China and I'm currently bench testing it with lab power supply. I will try to install it in my 1995 BMW E38. I looked in the wiring diagrams (for BMW) and if I understand correctly if I need to trigger doors to lock and unlock with 12V positive this is positive trigger system?

So in my understanding I need to t-tap Blue and Green wires from car alarm harness (6P section) into corresponding wires on my car.

I rechecked BROWN / white and white wires and they actually both rest at 4.54V, grounding them doesn't trigger alarm and they are really some sort of signal wires because they can't even power small LED.

Now I'm still confused why 1 of 4 motors in the diagram receives 4 wires and what are the purpose of those 2 wires?

if a wire rests at 5v and does nothing when you test using the lock switches or key cylinder then it is not a safe assumption to make that you can just shunt the wire to ground. could you be right? yes, my point is that it was not a suggestion you can just throw around lightly. you dont tell people to do something that could potentially damage their cars electronics without explaining the risks first. the price of repair is irrelevant.

so assuming these are signal wires what is the possible working principle for them? When window is closing and reach end position this wire should go to ground and drop to 0V indicating alarm computer to stop feeding power for closing wire?