Scion xB Dome Supervision

The Scion xB is equipped with a dome supervision function which turns on the dome light when you use the keyless entry, turns off the dome light 15 seconds after the doors are shut, etc. I installed a flip down monitor and tried using the dome lights which were built into it. I hooked up the continuos power, door switch, and ran a ground. The only way I could get the dome light to work was in the ON position, the DOOR postion would not work. So, I reinstalled the factory dome light, and it still will no longer work in the DOOR position. I have checked all the fuses, checked the wiring, and still nothing. It was suggested that I disconnect the battery and let it sit in order to discharge any capacitors and I have done that with no success. I would use the Toyota tech service, but they charge $50 a month to use it. Does anyone have any ideas? Does anyone know where the dome supervision module is located? I have seen the wiring diagrams, and it says where the door trigger wire is, then it says for dome supervision use door triigger. I disconnected that plug from the fuse block and it didn't help either.

As far as the wiring diagrams go, the xB has negative trigger. I just went and tried the dimmer switch with no success. It doesn't dim the dome light normally anyways. It seems as if something got burned up somewhere. Any more ideas?