Installing 3rd party car alarm, cant find two wires

I'm looking for the wires that go positive when the car doors are closed. These wires are tapped into and diode isolated into the door trigger wire of the alarm.

I found the blue and brown wires on the 30 pin connector go hot when the door is closed and ground when its opened (negative door trigger).

I told there is a brown and grey wire for the rear doors on different 36 pin connector, but I can't find them.

I know the car has a built-in factory alarm, but I'm doing a combo alarm/remote start with fantastic range.

I know I could use a data-link device to do all this via the CAN bus, but this is a home-brew interface to the car which gives it some very cool features that just can't be done any other way.

So all I need is the location of those two door trigger wires for the rear doors.

Thanks much.

 

Oh god, I think I know where they are. They are on connectors to the ECU, but on the back side, holy hell, this is gonna suck.