Door Trigger

|              12V|yellow & lt. grn/pur|+  |ignition harness            |
|          STARTER|green               |+  |ignition harness            |
|         IGNITION|RED / lt. green       |+  |ignition harness            |
|  SECOND IGNITION|gray / YELLOW         |+  |ignition harness            |
|        ACCESSORY|RED / black           |+  |ignition harness            |
| SECOND ACCESSORY|blue/lt. green      |+  |ignition harness            |
|       POWER LOCK|*1                  |   |*1                          |
|     POWER UNLOCK|*1                  |   |*1                          |
|       LOCK MOTOR|pink/black          |   |VSM *2                      |
|     UNLOCK MOTOR|RED / orange          |   |VSM *2                      |
|    DISARM DEFEAT|pink/orange         |   |VSM *2                      |
| PARKING LIGHTS +|brown               |   |headlight switch            |
|       HEADLIGHTS|RED / yellow          |+  |headlight switch            |
|     DOOR TRIGGER|BLACK/ lt. blue      |+  |either kick panel           |
| DOME SUPERVISION|use door trigger    |   |                            |
|  FCTRY ALARM ARM|                    |   |                            |
|FCTRY ALRM DISARM|                    |   |                            |
|       TACHOMETER|*3                  |   |ignition coils              |
|      SPEED SENSE|gray/black          |   |instrument cluster or *4    |
|       BRAKE WIRE|lt. green           |+  |brake pedal switch          |
|     HORN TRIGGER|blue                |-  |steering column or VSM *2   |
|           WIPERS|blue/orange         |-  |steering column             |
|  LF WINDOW UP/DN|wht/blk - tan/lt blu|A  |driver window switch        |
|  RF WINDOW UP/DN|wht/yel - tan/lt blu|A  |driver kick panel           |
|  LR WINDOW UP/DN|gry/org - yel/lt blu|A  |driver kick panel           |
|  RR WINDOW UP/DN|yel/blk - RED / blk   |A  |driver kick panel           |
|        RADIO 12V|lt. GREEN/ purple    |+  |radio                       |
|     RADIO GROUND|BLACK/ lt. green     |-  |radio                       |
|     RADIO SWITCH|pink                |+  |radio                       |
| RADIO ILLUMINATE|lt blue/red (dimmer)|+  |radio                       |
|       LF SPEAKER|org/lt grn-lt blu/wh|   |radio                       |
|       RF SPEAKER|wht/lt grn - grn/org|   |radio                       |
|       LR SPEAKER|gry/lt blu - tan/yel|   |radio                       |
|       RR SPEAKER|org/red - brn/pnk   |   |radio                       |

Notes:
NOTE: On DIESEL vehicles the wait to start light is activated by a databus wire from the ECM. To do wait to start use a pulse timer relay and follow directfax document #1091.  *1 Without keyless entry use pink / YELLOW for lock and pink/lt. green for unlock. They are 5 wire reverse polarity mastered from the driver switch and found in either kick panel. With keyless entry use WHITE/ red for lock and BLACK/ white for unlock. They are negative trigger and found at the VSM. On the vehicles with keyless entry the GEM shuts down after the doors have been locked for a certain time period, to "wake-up" the system refer to directfax document #1094.  *2 The VSM (Vehicle Security Module) is to the right of the accelerator pedal above the transmission hump below the radio. Not accessible from radio opening.  *3 For tach go to any one of the ignition coils and use the wire that is NOT RED / lt. green. On diesel vehicles the tach wire is green or white, in a 42 pin plug under the clamp on the engine side of the air intake duct.  *4 Also found at the radio on vehicles that have the in-dash CD changer.

From this diagram it appears the trigger is positive but another diagram I saw details it as negative.  I'm confused, please help!!

You have to find this wire and test it. Remember that all reference material found on this site ( and for that matter ) any where on the insternet is for reference ONLY. You as you installer have to test wires and ensure that they are what the diagrams say they are. Look here for a detailed explaination of the door trigger types and how to test for them :

Triggers

Door Trigger (-) Input

Connect to the lead(s) that only shows (-) ground when any door is open. If you're installing an alarm in a vehicle that does not have a common door trigger lead, you will need to connect two or more together using blocking diodes. (diagram)

Door Trigger (+) Input

Connect to the lead(s) that only shows (+) positive 12 V DC when any door is open. If you're installing an alarm in a vehicle that does not have a common door trigger lead, you will need to connect two or more together using blocking diodes. (diagram)