2001 ford f150 alarm/remote start

i have a 2001 ford f150, with a DirectStart Cs423. i am trying to hook up the alarm on it. I need to find out what wire to hook up to catch the door triggers?? it needs to be a  - input or  i need help to convert it to a negative input.  are the door triggers - or +      thanks

DOOR TRIGGER|blk/yel & blk/pnk   |-  |*5

5 The BLACK / YELLOW catches the drivers door and the BLACK/ pink catches the passengers door. The wires are found in there respective door harnesses. On the Super Crew the rear door trigger is BLACK/ lt. blue low in the driver kick panel. Use all wires and diode isolate each. See direct fax document #1076 for wiring information. Both wires may also be found at the GEM module located above the fuse box. On models without a dome light delay use ORANGE / lt. green (-) at the light switch.