My car alarm will only work when it wants too

Hey I have a 95 saturn sl2, 4 cylinder automatic, twin cam. With 160+k mileage.

my car alarm is being very strange. I can usually get it to work so that when you try to open the passenger front seat door it'll go off. But it wont go off when you try to open up any of the other doors. Tho I can make it so that when you go into the drivers side it'll go off when you try to start the car, but not for when you open the driver side door, or either of the back doors for that matter.

any ideas?