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I initially posted about this on Reddit but this forum looks a lot better so I'm repeating myself here.
I'm trying to wire a second central locking button. This is the dashboard button (shown below) that you can press to lock/unlock the van when sat in the cab. I want to keep this button as it is, but add another one in the rear of the van that does the same thing. The van is a campervan conversion, so I want to be able to lock/unlock the doors while laying in bed in the back and while sat in in the cab in the front.
So far, I've pulled the dash off and unplugged the cable running to the back of the button. In case anyone else wishes to do this, I'll put a picture below. Its a right pain to get this cable off since you have to reach in quite far with your hand and you can't see what you're doing. You have to feel for the tab thing I've labelled and push it into the connector to release it.
And so here is the connector that I've unplugged.
So now I must work out what these four wires do. Clearly, one of them is earth. I expect that another wire powers the light on the button (see first image). Possibly, the van central locking is activated when the remaining two wires are connected? Would love to see a wiring diagram of the button. I think I will just buy a spare and experiment with a multimeter & continuity tests, but I would appreciate any advice that folk may have?
Last edited by Isaac_Blanc (2024-09-05 16:06:32)
2018 Peugeot Expert Mk3 1.6L BlueHDi 115 hp
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I have no experience myself with that button, since mine's a lowly Mk1 with no electrics but I'd have the same inclination as you. I bet it's pretty simple, just a signal to the central locking system
2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt
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Cheers for the reply! Shall update the thread when I figure it out, although that may take some months as lots of other pressing conversion tasks right now. The system on my Mk1 was much simpler, since all the locks were broken.
2018 Peugeot Expert Mk3 1.6L BlueHDi 115 hp
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I am thinking that the requirements here will be the same as a simple two way light switch.
Might be a good idea to refresh on how they work?
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I am thinking that the requirements here will be the same as a simple two way light switch.
Might be a good idea to refresh on how they work?
I'd assume the button is more of a signal to a computery control. I bet it's just a switch that you briefly connect and it sends a pulse = toggle the locks
Isaac_Blanc - does the button stay pressed in or is it a push-release jobbie?
2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt
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I am thinking that the requirements here will be the same as a simple two way light switch.
I am famililar with this setup and love its simplicity but my hunch is that this will be different. The button is a push-release type, so its not like a two-way switch that stays in the position you have pushed it to.
I'd assume the button is more of a signal to a computery control.
This is more what I had in mind, but of course I don't know what sort of signal the computer is expecting. This thread in a VW T6 forum is interesting. They have a reverse-engineered wiring diagram, showing how the switch communicates with the computer (in their case, a 'body control module (BCM)') by adjusting the resistance between a particular wire and earth. However, it seems that their lock and unlock buttons are separate and connected to only two wires, so quite different from what I have on my Peugeot.
Last edited by Isaac_Blanc (2024-09-15 20:53:37)
2018 Peugeot Expert Mk3 1.6L BlueHDi 115 hp
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I recently removed most of my dash in order to change my heater matrix. This included removing the dash panel that the central locking button is embedded in, so I was able to do some experiments. Here is the dash panel on the electronics desk. Yes, it looks stupid to put the whole panel on the desk, but for the life of me I couldn't work out how to remove the button (circled in red) without breaking something.
Here is the back of the central locking button. As expected, it has four pins. Note that the dash panel is flipped over in this image, so the two pins circled in red are actually the top two pins when the panel is installed in the van, even though they appear to be the bottom two pins in the image. The middle two square black holes are just blanks. There are no pins sticking out of them and therefore nothing connects there.
I continuity-checked every combination of pins with the button pressed and unpressed. I found that there is continuity between the two pins circled in red only when the button is pushed. In this case, the resistance between the pins is about 5 Ohm. There is no continuity between any of the other pins, whether or not the switch is pushed.
Conclusion
The button is a normally open (NO) switch with an internal resistance of 5 Ohm. I think that briefly closing this switch by pressing the button sends a signal to the van to toggle the central locking. I think that the other two pins (not circled in the image) are for powering the LED. The multimeter probably can't provide enough voltage to overcome the LED threshold voltage, which is why it can't detect continuity between those two pins. Therefore, I think that I can wire a second 5 Ohm button in parallel to the circled pins and fit this in the back of the van. I will probably ignore the two LED pins, since I don't care about having an LED on my second button. That's all for now. Shall post when I next have time to work on this... probably in another three months.
Last edited by Isaac_Blanc (2024-12-18 15:00:57)
2018 Peugeot Expert Mk3 1.6L BlueHDi 115 hp
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