passlock II flashing security light

I just installed a autopage 855 in a 2005 envoy.  everything works fine except i noticed that when I arm the car, the security light flashes about 20 times and then goes out.  Even though it goes out, It still worries me.  I use the 555L and the 555G modules for the passlock  bypass and the door lock interface.  Also I was wondering if anyone knows how to access the dome light wire and parking light wire.  Diagrams say under rear seat at fuse box, but hard as hell to access, brown-park light, and grey/black for dome. the Grey/black goes to the door lock module as a plus voltage and converts it to a negative output from another wire which goes the alarm brain.  I dont have the grey/black(domelight) and brown(park light) wires hooked up yet.  I am not sure if these wires especially the dome light might have anything to do with the security light flashing when i arm the car.                 Thanks......