2003 Chevy Trail Blazer door trigger

Can some one point me in the right direction? I'm looking for the door trigger circuit on a 2003 Chevy Trail Blazer LS. This vehicle has no conventional pin switches, it utilizes the door's closing latch. My wiring diagram said that it was a black wire (-) at the pass door pin. (This truck has no pins).

I haven't done it, but I'd imagine you can find it behind the driver's side kick panel where the door wiring comes in.

it is going to be a brown wire located in the drivers door pillar.2005 Toyota Corolla S

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You will need to run a wire into each front door to obtain your correct circuit. The wire you need to attach it to is a gray/black in the driver's door at the module; a BLACK/ white in the passenger front door. For the back doors look for a a light blue/black coming out of the driver's rear door and a light GREEN/ black coming out of the passenger's rear door. You must diode isolate these wires and use their summed output to go to your alarm. The wires are all negative. To diode isolate the wires, install a one amp diode on each wire with the white band facing towards each door. Splice all 4 of the other ends of the diodes together to create your summed doorpin circuit. You can' use the wire at the interior light as most vehicles now don't activate their interior lights if the car senses there is enough ambient light during the day.sparky

You can save yourself some time and purchase the module from DEI.  It runs around $30 and and you only have to connect one wire  and it will activate your door trigger, door locks, flashing lights and horn.Do it right the first time