OK so.....
When my previous BMW needed an alarm, I did this same trick to operate the central locking from the drivers door lock. Its just another actuator that mechanically operates the existing lock, which then triggers the central locking. This was easy in the BMW due to it having rod type mechanisms, and worked faultlessly. Doing it this way just keeps the remote central locking isolated from the rest of the car's electronics, which is handy if youre not quite sure about what's what in the factory wiring loom.
The problem with the V35 is that it has cable operated systems, which I thought were going to be impossible to connect to.
after seeing the following videos... it seemed a whole lot easier
Part 1:
Part 2:
The other problem with the sedan is that the door trims are thinner. You have to install the actuator the other way around (above the speaker) for it to fit without cutting any metal away. And its still a bloody tight fit.
Im not saying this install is right or wrong, but it works for me.
Just a shame I didnt have any new woofers lying around to install while i had the door trim off...
Pic shows the back of the door trim with the installed actuator, the rod passing thru the door handle with all the required bends for clearance, and the clamp onto the lock cable. This was before I finished setting the clamp position.