Originally Posted by
itsmeonbmw
I've got a 1993 E36 Coupe model (325 engine) and I've spent today installing a Scorpion alarm. This comes with remote control of the central locking using a couple of N/O N/C relays installed within the brains of the unit. So here I am trawling about the internet looking for someone else whos already gone through the pain of figuring out the cars central locking wires.
Why has this sticky got 7 pages? Looks like I came to the same conclusion as lots of others, where I didn't understand the text without pictures.......
In summary, find your Central Locking module, and please remember this post only applies to those with a 1993 E36. The wiring diagrams changed after this year so I can't guarantee that this will work for you but it should.
Look for the nice white plug, and locate coloured wires White/Red, White/Grey and White/Brown/Yellow.
Cut White/Grey but not too close to the original plug.
Strip White/Red so you can solder another wire onto it
Strip White/Brown/Yellow so you can solder another wire onto it.
Okay so far?
To lock the car, your alarm brain/relay will have to have a N/O contact available. Wire +12V on one side and wire the White/Red onto the other. When you tell the brain to lock, it will send +12V to the CL module and all doors will lock.
To unlock the car, your alarm brain/relay (second relay) will have to have a changeover contact where you have a common with N/C and N/O contacts. Take the White/Grey wire that is still connected to the CL module (remember you cut this one) and connect it to the N/C contact. Take the other side of the White/Grey wire and connect it to the Common. And lastly, take the White/Brown/Yellow and connect it to the N/O contact side.
Connect everything up and test.
It worked for me and I'm very pleased with it.
Keith
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