Alarm help

I got an impules 990 alarm. And it seems to trip off the door sensor. The alarm remote will go off showing the doors. This happens after 20 seconds. Is there some bypass im forgetting??

This is installed in a 300zx. Now it does have some built in security module. I tried to wire into that but couldnt find it. I have read its behind the glove box but i have no idea where.. I took out the glove box and couldnt find it.  Help please!!!

Well right now i cheated and am using the negitive from the door light.  But this alarm has done piss me off. I arm it then 30 seconds later the remote goes off. After i cancel that it will be fine. But its everytime. Im thinking it has somethign to do with the dome light taking 30 seconds to turn off. I ripped this out of another Z. Im about to just strip it out and rewire it.

Any advise?? Thanks

1990 Nissan 300zx NA 5spd

Alarm looks to be an impulse 990. IT has the Fm2009. Tried to find the manual online but no luck. I have the manual but the wiring diagram is funny and hard to read.

Basicly after 30 seconds the remote goes off. After i hit a button on the remote it stops then all is well till i have to rearm it. I was able to get the dual prox to settle down by turning it down (T-tops). So instead of when you walk by, you now have to put your hand into the car to set off the alarm.

scroll to the wiring diragram. That is close to what i have.

http://www.asianwolf.com/FM2009V2.html