the door pin will not push down if the door is open, thats how it is, so the doors need to be shut before the pins can be pushed down for a start...
Not sure what the spring clip behind the yellow cap is, but test to see if the pump works as it should with the key in the door lock when locking the car...
If nothing id probably suggest that someones had a fettle with your wiring when the alarms been installed and unplugged something perhaps...
Also if youre from leeds, im over there thursday messing with another
mk2 ibiza if you want to pop over... obviously ill have to ask the other chap whos house it is if he minds, but if theres potential for a cheeky mcdonalds paid favor im in