GMC Yukon I (1991-1999) (behind left side of i/p) Wiring diagrams

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE AUX FAN CTRL IGNITION A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR CYCLING SWITCH (ON TOP RIGHT OF A/C ACCUMULATOR) A/C CTRL A/C HIGH PRESSURE CUTOUT SWITCH (ON BOTTOM REAR OF A/C COMPRESSOR) A/C LOW PRESSURE CUTOUT SWITCH (ON TOP REAR OF A/C COMPRESSOR) A/C MAXI FUSE 3 A/C REQ AUX FAN MINI FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (EXC 4.3L) (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLK/WHT WIRE BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF I/P, ON HEATER HOUSING) BLOWER SWITCH BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR BREAKOUT) FAN REQ FRONT MODE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FUSE BLOCK GRY WIRE GRY/BLK WIRE HEADLAMP BREAKOUT) HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER I/P ON TOP OF HEATER-A/C CASE) HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD FUSE-RELAY CENTER HOT IN RUN HOT IN RUN OR START IGN MINI FUSE A/C COMP MINI FUSE HTR A/C FUSE 12 LT BLU WIRE LT GRN WIRE OFF LO ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RED WIRE RELAY CTRL TAN WIRE UNDERHOOD FUSE-RELAY CENTER VALVE CTRL AIR TEMP DR SENSOR MODE SIGNAL A/C SWITCH VEHICLE CONTROL MODULE (LEFT REAR OF ENGINE COMPT) WATER VALVE (SUBURBAN, UTILITY, CREW CAB ONLY) (RIGHT CENTER OF INTAKE AREA) WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE AUX FAN CTRL IGNITION A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR CYCLING SWITCH (IN LOW PRESSURE LINE NEAR COMPRESSOR) A/C CTRL A/C HIGH PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C LOW PRESSURE CUTOUT SWITCH (ON LOW PRESSURE LINE) A/C MAXI FUSE 3 A/C REQ BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF I/P, ON HEATER HOUSING) BLOWER SWITCH BREAKOUT TO EBCM) BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR BREAKOUT) FRONT MODE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FUSE BLOCK GRY WIRE GRY/BLK WIRE HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER I/P ON TOP OF HEATER-A/C CASE) HOT AT ALL TIMES UNDERHOOD FUSE-RELAY CENTER HOT IN RUN HOT IN RUN OR START IGN MINI FUSE A/C COMP MINI FUSE HTR A/C FUSE 12 LT BLU WIRE LT GRN WIRE OFF LO ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT REAR OF ENGINE COMPT) PPL REAR DEFOGGER SYSTEM RED WIRE TAN WIRE VALVE CTRL AIR TEMP DR SENSOR MODE SIGNAL A/C SWITCH WATER VALVE (SUBURBAN, UTILITY, CREW CAB ONLY) (RIGHT CENTER OF INTAKE AREA) WHT WIRE YEL WIRE

BACK FOR- WARD BLK WIRE BLU WIRE CONVENIENCE CENTER CONVENIENCE CENTER (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE DOWN DOWN ENTIRE SEAT ENTIRE SEAT DOWN ENTIRE SEAT UP FORWARD/ REARWARD MOTOR REAR TILT MOTOR HOT AT ALL TIMES PWR ACCY CIRCUIT BREAKER I/P FUSE BLOCK (LEFT SIDE OF I/P) LT BLU WIRE LUMBAR SUPPORT CIRCUIT ORG/ WIRE POWER SEAT SWITCH REAR HEIGHT FRONT HEIGHT FRONT HEIGHT TAN WIRE UP REAR HEIGHT YEL WIRE

3 2 PPL AUX PWR FUSE 7 BLK WIRE BLK/WHT WIRE DATA LINK CONNECTOR (LEFT SIDE OF I/P) DIESEL GASOLINE DK GRN WIRE DLC CONTROL ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT WHEELHOUSE) HOT AT ALL TIMES I/P FUSE BLOCK INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE (UNDER DRIVER'S SEAT CARPET) ORG/ WIRE POWER STEERING CONTROL MODULE (CENTER OF I/P) DATA CLSS POWERTRAIN CONTROL MODULE (RIGHT SIDE OF I/P) DATA CLSS PPL PPL DATA CLSS 2 PROG ENABLE RADIO REMOTE CONTROL DOOR LOCK RECEIVER (BEHIND CENTER OF I/P) SERIAL DATA TAN WIRE TAN/WHT WIRE TRANSFER CASE CONTROL MODULE (STEERING COLUMN SUPPORT BRACKET) UART DATA VEHICLE CONTROL MODULE (ENGINE COMPT, NEAR EBCM)

BLK WIRE BRN WIRE HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL MODULE I/P FUSE BLOCK ORG/ WIRE PICK-UP W/ EXTENDED OR CREW CAB PPL PPL PPL PPL/WHT WIRE REAR DEFOGGER SWITCH REAR WINDOW DEFOGGER GRID RIGHT CARGO DOOR CONTACTOR LEFT CARGO DOOR CONTACTOR RIGHT REAR CARGO DOOR DEFOGGER GRID LEFT REAR CARGO DOOR DEFOGGER GRID RR-DEFOG MINI FUSE SOLID STATE TIME DELAY RELAY SUBURBAN/UTILITY W/ LIFTGATE SUBURBAN/UTILITY W/O LIFTGATE UNDERHOOD FUSE/RELAY CENTER

AUXILIARY LEAD (TAPED TO HARNESS) BACKUP LIGHTS CIRCUIT BLK WIRE BLU WIRE BRN WIRE CAB CLEARANCE LAMPS CARGO LAMP CR LP CARGO LAMP SWITCH CENTER HIGH MOUNT STOP LAMP CH- MSL LP CLUSTER BREAKOUT) COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) CRUISE CONTROL SYSTEM CTSY FUSE 3 DK BLU WIRE DK GRN WIRE GRN WIRE GRY WIRE HARNESS BREAKOUT) (W/ TRAILER PKG) HAZARD NORMAL HEADLAMP, PANEL DIMMER SWITCH HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT AT ALL TIMES UNDER- HOOD FUSE- RELAY CENTER (LEFT REAR OF ENGINE COMPT.) HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRU- MENT CLUSTER RIGHT TURN INDIC INTERIOR LIGHTS SYSTEM CONVENIENCE CENTER (UNDER LEFT SIDE OF DASH) LEFT LEFT FRONT PARK/ TURN LAMPS LEFT HEADLAMP BREAKOUT) LEFT LICENSE LAMP TOWARD TAILLAMP BREAKOUT) LEFT TAIL/ STOP/ TURN LAMP LEFT TURN INDIC LH RH LICENSE LAMP LICENSE LAMP BREAKOUT) LICENSE LAMPS LT BLU WIRE LT GRN WIRE MAXI FUSE 2 NCA WIRE OFF ORG/ WIRE PARK PARK LPS FUSE 9 PICKUP PLATFORM HITCH GROUND PNK WIRE PPL REAR CLEARANCE LAMPS CIRCUIT RED WIRE RHEO- REAR CLEARANCE LAMPS CIRCUIT STAT RIGHT RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN LAMPS RIGHT HEADLAMP BREAKOUT) RIGHT TAIL/ STOP/ TURN LAMP STOP- LAMP RELAY (EXCEPT SUBUR- BAN/ UTILITY) STOP/ HAZ FUSE 1 SUBURBAN/ UTILITY TCC/ STOP LAMP SWITCH (TOP OF BRAKE PEDAL) TRAILER HARNESS BREAKOUT) TRAILER TOWING ADAPTER (WIRES ARE CUT AND TAPED TO HARNESS) TURN B/U FUSE 16 TURN PWR HAZ PWR FLSHR OUT GND TURN/ HAZARD SWITCH TURN/HAZARD FLASHER (CONVENIENCE CENTER: UNDER LEFT SIDE OF DASH) UNDER- HOOD FUSE RELAY CENTER (LEFT REAR OF ENGINE COMPT.) W/ DUAL REAR WHEELS W/ STEP BUMPER W/O STEP BUMPER WHT WIRE YEL WIRE

AUDIO ALARM MODULE AUXILIARY COOLING FAN MOTOR BLK WIRE BLK/GRY WIRE BTSI GROUND CIGAR LIGHTER CONVENIENCE CENTER DATA LINK CONNECTOR DAYTIME RUNNING LAMPS MODULE FROM CONVENIENCE CENTER (DIAGRAM 3 OF 4) FRONT WINDSHIELD WIPER/ WASHER PUMP MOTOR HEADLAMP AND PANEL DIMMER SWITCH HEATER AND A/C CONTROL SWITCH HVAC CONTROL MODULE I/P COMPARTMENT ASHTRAY LAMP LAMP IGNITION STEERING SWITCH COLUMN GROUND GROUND INFLATABLE CARGO RESTRAINT LAMP I/P MODULE SWITCH ENABLE (PICKUP) SWITCH LEFT BATTERY LEFT FOG LAMP LEFT FRONT DOOR JAMB SWITCH LEFT FRONT PARK/ TURN LAMP LEFT HIGH/ LOW BEAM HEADLAMP LEFT HORN LEFT LEFT HIGH LOW BEAM BEAM HEADLAMP HEADLAMP LOW COOLANT LEVEL INDICATOR MODULE POWER POWER OUTLET OUTLET RADIO REAR WINDOW WASHER PUMP MOTOR REAR WINDOW WIPER/ WASHER SWITCH REAR WINDOW WIPER/ WASHER SWITCH (SUBURBAN/ UTILITY) RIGHT FOG LAMP RIGHT FRONT DOOR JAMB SWITCH RIGHT FRONT PARK/ TURN LAMP RIGHT HIGH BEAM HEADLAMP RIGHT HIGH/ LOW BEAM HEADLAMP RIGHT HORN RIGHT LOW BEAM HEADLAMP SPARE TRANSFER CASE CONTROL MODULE TRANSFER CASE SELECT SWITCH TURN/ HAZARD FLASHER UNCOATED W/ DUAL HORNS WINDSHIELD WIPER MOTOR MODULE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C MAXI FUSE 3 AIR TEMP DR SENSOR MODE SIGNAL BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF I/P, ON HEATER HOUSING) BLOWER SWITCH BRN WIRE DK BLU WIRE DK GRN WIRE FRONT MODE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FRONT TEMPERATURE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FUSE BLOCK GRY WIRE HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER I/P ON TOP OF HEATER-A/C CASE) HOT AT ALL TIMES HOT IN RUN HTR A/C FUSE 12 LT BLU WIRE OFF LO ORG/ WIRE PPL REAR DEFOGGER SYSTEM RECIRC CTRL IGNITION RECIRC DOOR BREAKOUT) RECIRCULATION DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) RED WIRE TAN WIRE UNDERHOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C MAXI FUSE 3 AIR TEMP DR SENSOR MODE SIGNAL BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLOWER MOTOR BLOWER RESISTOR (UNDER RIGHT SIDE OF I/P, ON HEATER HOUSING) BLOWER SWITCH BRN WIRE DK BLU WIRE DK GRN WIRE FRONT MODE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FRONT TEMPERATURE DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) FUSE BLOCK GRY WIRE HEATER AND A/C CONTROL MODULE HIGH BLOWER RELAY (UNDER I/P ON TOP OF HEATER-A/C CASE) HOT AT ALL TIMES HOT IN RUN HTR A/C FUSE 12 LT BLU WIRE OFF LO ORG/ WIRE PPL REAR DEFOGGER SYSTEM RECIRC CTRL IGNITION RECIRC DOOR BREAKOUT) RECIRCULATION DOOR MOTOR (UNDER I/P ON HEATER- A/C CASE) RED WIRE TAN WIRE UNDERHOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE

BLK WIRE BLU WIRE BRN WIRE CONVENIENCE CENTER (BEHIND LEFT SIDE OF I/P) CTSY FUSE 3 DOWN GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK ILLUM- NATION LAMP LEFT LEFT OUTSIDE POWER REARVIEW MIRROR LEFT/ RIGHT MOTOR LT GRN WIRE ORG/ WIRE POWER OUTSIDE REARVIEW MIRROR SWITCH PPL/WHT WIRE RED WIRE RIGHT RIGHT OUTSIDE POWER REARVIEW MIRROR UP/ DOWN MOTOR YEL WIRE