What I know is that the door lock vacuum pump is under the rear seat. There is a wire from each front door and the trunk locks. I believe the driver side lock uses the blue wire, the passenger side lock uses the green wire and the trunk lock uses the black wire. The wire gets a 12V signal to unlock and ground signal to lock.
That's as much as I know. I think you might rephrase your query. You're asking where to connect those terminals on your alarm box, right? That is not a list of wires in the car.
The 2nd and 3rd channel outputs are for something extra you want the key fob to do. It can pop the trunk or roll up the windows or start the car, etc. You decide. Whatever it is, it'll probably require a few more relays.
For the locks, MB uses a unique 1 wire per lock system. Get the item from Crutchfield or find someone who knows electronics to help you.
If you can't get the manual, make friends with someone who has the manual.
Oh, if you car has a factory alarm, it might have to be disabled.
86 300SDL (due soon)
81 300SD (for sale cheap)