95 nissan altima door locks

I installed a black widow fm7150 alarm in my nissan altima 95. Sometimes when i press the disarm/ unlock buton the doors unlock but quickly lock right back again. but the car is disarmed. It does not happen every time. I say 3 out of every 10 times i press the button. can any one help me.screamon deamon

Nissans have issues with door lock timers..known problems on maxima's and infiniti's..94 and older. Don't get fooled into thinking it is an alarm issue.. Bad solder joints on the door lock timers cause the system to have a mind of their own. Check to see if your altima has this doortimer issue.. Regardless did you diode isolate the lock/unlock circuits to prevent feedback ? I'm not an installer..just a hobbyist who has installed a couple of of systems.. You might get better answers from experts here..