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Vehicle Wiring Details for your
1998-1999 Gmc Suburban Wiring Diagram
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Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 1998-1999 Gmc Suburban . This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle. Please be sure to test all of your wires with a digital multimeter before making any connections. More information on using a multimeter and testing wires please see our Technical Support Area.

 PART   COLOR  LOCATION
 12 VOLT CONSTANT   RED (+)   @ IGNITION SWITCH HARNESS
 STARTER  YELLOW (+) or PURPLE (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  PINK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  WHITE (+), See NOTE #5  @ 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 ( - )  N/A  
 PARKING LIGHTS ( + )  BROWN (+)  @ HEADLIGHT SWITCH or in DRIVERS KICK PANEL
 POWER LOCK  LIGHT BLUE (TYPE A)  IN EITHER DOOR BOOT
 POWER UNLOCK  WHITE (TYPE A)  IN EITHER DOOR BOOT
 DOOR TRIGGER  PURPLE (-)  @ HEADLIGHT SWITCH
 DOMELIGHT SUPERVISION  WHITE (-) (Requires Part #775 Relay)  @ UNDERDASH LIGHT
 TRUNK RELEASE  BLACK or BLACK/WHITE, See NOTE #2, (Requires Part #775 Relay)  LOW IN DRIVERS KICK PANEL
 SLIDING POWER DOOR  N/A  
 HORN  BLACK (-)  @ STEERING COLUMN HARNESS
 TACH  WHITE (AC)  @ ECM, See NOTE #3
 WAIT TO START LIGHT  DARK BLUE (-), See NOTE #4  @ INSTRUMENT CLUSTER
 BRAKE  WHITE (+)  @ SWITCH ABOVE BRAKE PEDAL
 FACTORY ALARM DISARM   N/A  
 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: on vehicles with REAR LIFT WINDOWS it is a (+) Positve system, on vehicles with the CARGO DOORS it is a 5-Wire System See DIAGRAM NOTE #3: the ECM (Electronic Control Module) is located on the DRIVERS SIDE INNER FENDER, the TACH wire is in a BLACK Plug marked WHITE. NOTE #4: 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 #5: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!
 
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