Civic EG

I need some help on an electrical project. I need to use the door switch, because I want the thing to go on with the doors opened. I took the rear left panel to look at the switch, and I found out that it is only one wire - either a ground or the opposite. But, I also figured after that, that I can't use only one of those switches, as it will go on with only one of the doors. So, where is the wire that goes to the light on the roof?

rather run it from the light in the boot. that always comes on when any door is open. the one in roof also has the on at any time and can cause shorting with what every it is you are wantting to do. (talking from being down that road)

hope it helps