alarm wire question, mainly about the doors Options

[Terzin1]

first off, i need to know whether my celica, which has power locks, runs off negative switching door pin switches or postive 12 volt door pin switches. also, there is a wire that hooks to the brain of my alarm to detect if someone gets in the car through my trunk, does anyone know what wire to splice that into? my alarm system is a crimeguard 745i

[Coomer]

It's a negative door trigger. Test the red and white wires and find the one that gives you +12 volts with both doors closed and ground with either(or both) doors open. I may have a picture of exactly which wire you need to tap into at home.

And I'm not sure about the trunk pin. I do know that on hatchbacks it's tied into the door pin circuit, but not on coupes.