I'm in the process of replacing the old alarm system with a new one. Main reason so I can get engine start to heat up the car before I jump in.

I've read previous forums but couldn't find the info I'm after.

To make things easier I've used the feed off the original alarm for the indicators and door locking/unlocking functions.

I've even got the engine start to work. But I can't find the wire for the door open / close function. The one that tells the alarm that the door is open. Anyone know what colour wire it is and where?

More importantly I can hear the old alarm unit clicking each time I get into the car. How can I stop that?

If I remember the switch is in the door lock, you need to look in the loom that goes to the drivers door, use a test light that is + positive supplied and prob for the wire. It will turn negitive when the door is opened, also have you removed the transponda in the key and taped it under the calin near the ignition.

you know what i avoid bmw's when it comes to alarms, i watched my work mate do a viper alarm into an old E39 and AGRO isnt the word! i think he was doing it for about 4 hours and hes my guy that i get to do the one i hate doing lol, thing is now because everying new runs on canbus theres not alot involved in fiting alarm nowadays, its mostly plug and play with a bit of setting up on the laptop.
i need to book up a training day with directed soon

if its the standard fiat or meta one it only sounds and doesnt immobilise, my 20vt 98 had a metta and i just unpluged it, though now im thinking, why didnt you use the wires that went to the alarm brain, all the power, siren, earth, indicators, door switch, bonet switch, boot switch, ect are all there in the alarms loom, all you need to do is probe, tag,join, solder and the job is done much quicker

sorry for chipping in again dudes,[Sounds like a recipe for kaboooom ] but rule no 1 as an alarm fitter is or at least used to be!! make your own connections never use existing alarm wires as dodgy connections, dry joints, or faults, broken circuits, even shorts, will be transferred to the new items,
You found the door switch wire yet??Hey come on you two this isn’t even funny! hems [no disrespect]sounds like you don’t know haw to test a circuit so Just go to the interior light for the switch wire and follow the wire down the a pillar etc lol lol

Thats the first thing i tried, but my interior light isn't working, and i iv'e checked all the fuses, and still can't get it to work, so i gave up on that route and am trying to to get the feed directly off the door wiring loom.