I have just installed a Toad LCA2000 pager on my 05 WRX and it only works when the drivers door is opened! I followed the instructions for fitting it direct to the door pin circuit (drivers door) with the blue wire to ACC. If the drivers door is opened the pager activates but doesn't when the other doors are opened. I assumed all the door pins were on the same circuit but obviously not.
Would I be better wiring the interior light to this circuit as this works with all doors?
The pager instructions give 2 options, either the way I have done it or wiring into the alarm system. Only problem is I don't know where the alarm is
I have had a look under the bonnet but I can't see it, unless it is hidden behind or under something - Any suggestions...

Wiring for pager is;
Red - perm live
Black - ground
Blue - ACC (live until keys removed)
White - door pin +
Grey - door pin -
Yellow - not used