1996 Ford Taurus

I installed a remote starter in a 1996 Ford Taurus - and am trying to hook up the remote starter's keyless entry.  I have it all working, but I am unable to arm the factory alarm.  I tried using a relay to pulse the positive door trigger along with the lock pulse - this did not work.  I used the BLACK/ lt. blue wire on the courtesy light, which is where I am told the positive door trigger wire is located.  It does turn on the dome light when the doors lock, but it does not arm the factory alarm.  I know if I could find the wire colors for the 7 and 9 button the the door keypad - I can diode isolate those to pulse on lock, which would lock and arm the factory alarm.  Any help would be appreciated.

glad to help