1998 4-door yukon

|              12V|red                 |+  |ignition harness            |

|          STARTER|yellow or purple    |+  |ignition harness            ||         IGNITION|pink                |+  |ignition harness            ||  SECOND IGNITION|white *1            |+  |ignition harness            ||        ACCESSORY|orange              |+  |ignition harness            ||       POWER LOCK|lt. blue            |*2 |either door boot            ||     POWER UNLOCK|white               |*2 |either door boot            ||       LOCK MOTOR|gray                |   |drivers door boot           ||     UNLOCK MOTOR|tan                 |   |drivers door boot           ||    DISARM DEFEAT|tan                 |   |passengers door boot        || PARKING LIGHTS +|brown               |   |headlight switch *3         ||       HEADLIGHTS|yellow              |+  |headlight switch            ||     DOOR TRIGGER|purple              |-  |headlight switch            || DOME SUPERVISION|white               |-  |underdash light             ||  TRUNK/HATCH PIN|tied with doors     |   |                            ||TRNK/HTCH RELEASE|black or blk/wht    |*4 |low in the drivers kick     ||       TACHOMETER|white               |   |ECM *5                      ||      SPEED SENSE|green               |4  |ECM *5                      ||       BRAKE WIRE|white               |+  |at brake pedal switch       ||     HORN TRIGGER|black               |-  |at column                   ||           WIPERS|purple              |+  |steering column             ||  LF WINDOW UP/DN|dk. blue - brown    |A  |at drivers door switch      ||  RF WINDOW UP/DN|lt. blue - tan      |A  |dr door or kick panel       ||  LR WINDOW UP/DN|dk. grn - purple    |A  |drivers kick panel          ||  RR WINDOW UP/DN|lt. grn - purple    |A  |drivers kick panel          |

Notes:

Note: This vehicle has the passlock II immobilizer system that, when adding a remote start, must be interfaced with. Use DEI part 555t or 555L.  Note: Diesel glow plug, dk. blue(-) located at the instrument cluster.  *1 Required for remote start operation.    *2 The 4 door versions are positive trigger, and the 2 door versions are 5-wire.  *3 also found low in the drivers kick panel.  *4 positive trigger on models with rear lift window, and 5 wire on models with cargo doors.   *5 ECM is located on drivers side inner fender. Tach wire found in a black plug marked "white".

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Beware Bro.. becareful when messing with the Door and Rear Door trigger Wires. If your not careful, you can smoke the BCM.  I installed an alrarm on remote start on a 97. Velocity might be able to confirm this so hopefully he'll see this post again. You will have to diode isolate the trigger wires that are from the Driver door and the rest of the doors (rear hatch  is part of the trigger wire for the pass and rear doors). Theres a diagram somewhere. Ill try and find it. I also found that for whatever reason, after the doors and trunk are shut, the BCM sends pulsed signals back through the trigger wires. What i had to do on my grand prix is.. cut the trigger wires and diode isolate them as well to stop the BCM from sending that signal then tie the alarm trigger wire on the opposite side of the BCM. If it confuses you, let me know and ill explain better on the phone or something. Hey Velocity, can you confirm this? I found that with my 00 Grand Prix that after i armed the alarm, with a minute or two, the alarm would go off bc the BCM was sending those signals. I finally realized it when i loaded Cliffnet Wizzard and it was showing the door and trunk open with a minute of closing them. ??