Hope this helps, sorry the format is a little tough to read.
EXPRESS VAN 2007
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's PASSLOCK 2 ANTI-THEFT System, Requires 791 Bypass Module
PART COLOR LOCATION
12 VOLT CONST RED / BLACK (+) IGNITION SWITCH HARNESS
STARTER YELLOW (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS
IGNITION 2 WHITE (+) See NOTE *4 IGNITION SWITCH HARNESS
IGNITION 3 N/A
ACCESSORY /HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS
ACCESSORY /HEATER BLOWER 2 N/A
KEYSENSE LIGHT GREEN (-) IGNITION SWITCH HARNESS
PARKING LIGHTS ( - ) BROWN / WHITE (-) @ BCM, BROWN Plug, Pin B2, See NOTE *1
PARKING LIGHTS ( + ) BROWN (+) @ FUSEBOX UNDER DRIVERS SEAT
POWER LOCK LIGHT BLUE (TYPE B) @ BCM LIGHT BLUE plug, Pin B5, See NOTE *1
POWER UNLOCK WHITE (TYPE B) @ BCM, LIGHT BLUE plug, Pin B10, See NOTE *1
DOOR TRIGGER See NOTE *2 @ BCM, LIGHT BLUE plug, See NOTE *1
DOMELIGHT SUPERVISION GRAY/BLACK (+) or DARK BLUE/WHITE (+) @ BCM, BLACK Plug, Pin E, See NOTE *1
TRUNK RELEASE N/A
SLIDING POWER DOOR N/A
HORN TAN (-) @ BCM, GRAY Plug, Pin B9, See NOTE *1
TACH WHITE or PURPLE @ PCM, GREEN plug, Pin 26, See NOTE *3
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM N/A
ANTI-THEFT YELLOW (+) and BLACK (-) or TAN (-) GM's PASSLOCK 2 System, these wires exit the Ignition Switch Tumbler together and are in the Main Ignition Switch Harness in the Column.
EXTRA INFORMATION
NOTE *1 The BCM (Body Control Module) is located under the PASSENGER side of the dash, behind the knee bolster. NOTE *2 This vehicle has 3 door triggers, the DRIVERS DOOR is a TAN (-) Pin B4, the PASSENGER DOOR ad REAR CARGO DOOR is a LIGHT GREEN (-) and the REAR DOORS and SLIDING DOOR is a YELLOW/BLACK (-) in Pin A10. When connecting to an ALARM SYSTEM, use all 3 and DIODE ISOLATE. See DIAGRAM NOTE *3 The PCM (Power Control Module) is located on the DRIVERS SIDE FENDER. On the 4.3L engine the TACH wire is WHITE, and on the 4.8L, 5.3L and 6.0L the TACH wire is PURPLE. NOTE *4 IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!
Information is a reference only. It is your responsibility to verify any circuit before interfacing with it using a digital multimeter.
"D"
Precision Autosound - Owner
MECP Master Installer