Gmc  Full Size Pickup (New Body Style) 1999-2002
 PART   COLOR  LOCATION
 12 VOLT CONSTANT   RED (+)   @ IGNITION SWITCH HARNESS
 STARTER  YELLOW (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  PINK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  WHITE (+), See NOTE #7  @ IGNITION SWITCH HARNESS
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  ORANGE (+)  @ IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  N/A  
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  WHITE (-)  @ BCM, LIGHT BLUE Plug, See NOTE #2
 PARKING LIGHTS ( + )  BROWN (+)  @ BCM, LIGHT BLUE Plug, See NOTE #2
 POWER LOCK  LIGHT BLUE (TYPE A)  @ BCM, BROWN Plug, See NOTE #2
 POWER UNLOCK  WHITE (TYPE A)  @ BCM, BROWN Plug, See NOTE #2
 DOOR TRIGGER  See NOTE #3  @ BCM, See NOTE #2
 DOMELIGHT SUPERVISION  TAN (-)  @ BCM, PURPLE Plug, Pin B4, See NOTE #2
 TRUNK RELEASE  N/A  
 SLIDING POWER DOOR  N/A  
 HORN  BLACK (-)  @ BCM, BROWN plug, See NOTE #2
 TACH  WHITE (AC), See NOTE #5  @ ECM, See NOTE #4
 WAIT TO START LIGHT  See NOTE #6  
 BRAKE  WHITE (+)  @ SWITCH ABOVE BRAKE PEDAL
 FACTORY ALARM DISARM   LIGHT GREEN (-)  IN DRIVERS KICK PANEL
 ANTI-THEFT  YELLOW (+), ORANGE/BLACK (-) and RED/WHITE (Not used)  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: This vehicle uses GM'S PASSLOCK 2 ANTI-THEFT SYSTEM that requires a 791 Bypass Module to Remote Start, to order go to the SECURITY BYPASS MODULES Page on this website. NOTE #2: The BCM (Body Control Module) is located behind the drivers side of dash. The plugs on the BCM face the rear of the vehicle. NOTE #3: At the BCM the DRIVER DOOR is a TAN (-) Pin B4 of the PURPLE PLUG, the PASSENGER DOOR is a ORANGE (-) Pin B2. When connecting to an ALARM SYSTEM, use both Door Trigger wires and DIODE ISOLATE. to connect, See DIAGRAM NOTE #4: The ECM (Engine Control Module) is located near the battery and down low between the fender and fan under a BLACK plastic cover. On the 4.3L engine the TACH wire in at Pin 20 in the connector marked "RED" On the 4.8L, 5.3L and 6.0L engines, it is located at Pin10 in the RED connector. NOTE #5: THE DIESEL TACH wire is also a WHITE (AC) but at the Instrument Cluster. NOTE #6: when hooking up a remote starter, if you cannot get the (+) or (-) Wait to Start wire on the Remote Starter to work properly, you will then need to disconnect this wire and Program the Remote Starter for the 5, 10, 15 or 20 Second Wait to Start Timmer in the Installation manual. NOTE #7: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!