1991 honda civic dx wire problem

connect the green wire to the Civic 12 volt constant wire, as mentioned above 

Once you're sure all the wires are connected, I suggest starting the car with the key manually .. letting it run for 1 minutes.  Then, shut it down and initiate the remote sequence to remote start the car (this process is documented in the scanned pages of the manual you showed me)

i'm not seeing it on that diagram either -- it may just be a white wire (according to that diagram)

Basically, look in the ignition wiring loom/harness and you'll test all the wires, and you'll find one that 12vdc always (meaning with the key in the off position, on and crank positions).

the voltage of the white wire drops during the cranking and starting up of the engine b/c the starter (the actual engine starter) is drawing a considerable amount of current from the battery, dropping its potential.  The r/s brain that uses voltage sensing detects this drop and knows that whenthe resting potential is restored, the car is running (i.e. the engine has started appropriately)

oh, i see now....

Do you have the secondary/hidden conrol box?

There are some connections for this box (it's in one of the pages you scanned in this thread)

One of things listed on that page is the "learning button."  I believe you are supposed to press this button before you start the car with the key, then start the car with the key, and it should learn the voltage sensing.

I still think the green "alternator" wire needs to be connected to 12 volts constant (i.e. the white wire will still do)

Did you use the learning button last week?