GMC Sierra III facelift (2015-2018) underhood fuse block Wiring diagrams

6.0L 6.0L 6.6L A/C CLUTCH RLY CTRL A/C COMPRESSOR CLUTCH RELAY A/C PRESS 5 VOLT REF 1 A/C REFRIGERANT PRESS SENS LO REF A/C REFRIGERANT PRESS SENS SIG A/C REFRIGERANT PRESSURE SENSOR AC CLTCH FUSE AMBIENT AIR TEMP SENS LOW REF AMBIENT AIR TEMPERATURE SENSOR AMBT AIR TEMP SENS SIG B+ VOLT BATT POS VOLT BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/WHT WIRE BLU WIRE BLU/GRY WIRE BLU/VIO WIRE BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COOL FAN 1 FUSE COOL FAN 2 FUSE COOL FAN CLTCH FUSE COOLING FAN 5 VOLT REF COOLING FAN CONTROL MODULE (6.6L) COOLING FAN LOW REF COOLING FAN RELAY COOLING FAN SPEED SIG CTRL SIG DK BLU WIRE DK BLU/GRY WIRE ENG COOLANT TEMP SENS SIG ENGINE CONTROL MODULE ENGINE CONTROLS IGNITION RELAY ENGINE COOLANT TEMPERATURE SENSOR GRN WIRE GRY WIRE GRY/RED WIRE HI COOLING FAN RLY CTRL HI SPD COOLING FAN RLY CTRL HI SPD GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES LEFT COOLING FAN MOTOR (4.3L, 6.2L, 5.3L) LO REF LOGIC B+ LOW REF MIRROR AMBIENT AIR TEMPERATURE SENSOR OUTSIDE AMBIENT AIR TEMP SENS LOW REF PASSENGER OUTSIDE REAR VIEW MIRROR RED/BRN WIRE RED/GRY WIRE RED/WHT WIRE RIGHT COOLING FAN MOTOR (4.3L, 6.2L, 5.3L) RLY SPD SIG SIG GND OUTSIDE AMBIENT AIR SENS SIG SPD SIG TCM/ECM FUSE UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLK WIRE WHT/GRY WIRE

12 VOLT REFERENCE A/C CMPRSR MDL/BATT RVC FUSE ACCESSORY VOLT ACCESSORY WAKEUP SER DATA ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM BATT POSITIVE VOLT BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BLU/GRY WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) BRN/GRN WIRE BRN/GRY WIRE BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COURTESY LAMP SW SIG CRUISE CONTROL SYSTEM CRUISE CONTROL SYSTEM WIPER/WASHER SYSTEM CTRL SW SIG CURRENT SENS CTRL CURRENT SENS SIG DIMMER SW HIGH BEAM SIG DK BLU WIRE DOOR LOCK ACTUATOR UNLOCK CTRL DOOR LOCK CONTROL DOOR LOCK CTRL 2 DOOR LOCK KEY SW UNLOCK SIG DOOR LOCKS, ANTI-THEFT SYSTEMS DOOR LOCKS, ANTI-THEFT, INTERIOR LIGHTS SYSTEMS DRIVER DOOR LOCK MTR STATUS ELECTRONIC MUFFLERS SYSTEM EXHAUST BRAKE SW CTRL EXTERIOR LIGHTS, INTERIOR LIGHTS SYSTEMS GAP UP/DOWN SW SIG GRN WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/GRN WIRE GRY/VIO WIRE GRY/YEL WIRE HAZARD SW LEFT TURN SIG HAZARD SWITCH RIGHT TURN SIG HDLP SW FLASH TO PASS SIG HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM HORNS SYSTEM HI SPEED GMLAN SER DATA (-) 1 HOOD AJAR SW SIG HORN SW SIG HOT AT ALL TIMES IGNITION KEY RESISTOR SIG IGNITION SWITCH IMMOBILIZER RETURN IMMOBILIZER SUPPLY VOLT INADVERTENT POWER CTRL INTERIOR LP CTRL KEY-IN IGNITION SWITCH LED AMBIENT LIGHTING CTRL LED BACK LT DIMMING CTRL LEFT FRONT DOOR AJAR SW SIG WIRELESS CHARGING SYSTEM CHARGE IND CTRL LF DRL CTRL LH DETECTION SIG LH HDLMP LOW BEAM CTRL LIN BUS 3 LIN INTERCONNECT NTWRK BUS 2 LIN INTERCONNECT NTWRK BUS 3 LOCK CTRL LOCK SW SIG 16 17 TRAILER BRAKE APPLY SIG LOW REFERENCE LOW SPEED GMLAN SERIAL DATA LT GRN WIRE LT GRN/VIO WIRE LT GRN/YEL WIRE MOTOR STATUS SIG NETWORK BUS 11 NETWORK BUS 5 OFF OFF/RUN/CRANK VOLT PASS SEAT VENT MTR CTRL 1 POWER DISTRIBUTION SYSTEM PUDDLE LAMP CTRL RAP RELAY COIL CTRL REAR LICENSE LP CTRL RED/YEL WIRE RELAY COIL SUPPLY VOLT RF DOOR AJAR SW SIG RF TURN SIG LP CTRL RH DETECTION SIG RH HDLMP LOW BEAM CTRL RR LK MTR STATUS SIG RR TURN SIG LP CTRL RUN WIRE RUN/CRANK IGNITION 1 VOLT RUN/CRANK RELAY COIL CTRL SEATS SYSTEM SELECT SW PERFORMANCE SIG SERIAL DATA COMM ENABLE SET/COAST/RESUME/ ACCELERATE SW SIG SHIFT INTERLOCK SOLENOID CTRL SHIFT INTERLOCK SYSTEM SIG GROUND STANDING LAMP RLY CTRL STARTING/CHARGING SYSTEM STOP LP RLY COIL CTRL TAP UP/TAP DOWN SW SIG TRANSMISSIONS SYSTEM UNDERHOOD FUSE BLOCK UNLOCK CTRL VIO/BLK WIRE VIO/BLU WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/GRN WIRE WHT/RED WIRE WHT/VIO WIRE WHT/YEL WIRE WINDSHIELD WASHER RLY CTRL WINDSHIELD WASHER SW SIG WINDSHIELD WIPER SW LOW SIG WIPER MTR PARK SW SIG WIPER SW HIGH SIG WIPER/WASHER SYSTEM WIPER/WASHER SYSTEM POWER DISTRIBUTION SYSTEM YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/VIO WIRE YEL/WHT WIRE

BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLU WIRE BLU/VIO WIRE BLU/YEL WIRE COMPUTER DATA LINES SYSTEM COOL FAN CLTCH FUSE COOLING FAN CONTROL MODULE COOLING FAN RELAY CTRL SIG DATA 1 (+) DK BLU WIRE DRIVER INFORMATION CENTER DISPLAY ECT SENS SIG ENGINE CONTROL MODULE ENGINE COOLANT LEVEL SWITCH ENGINE COOLANT TEMPERATURE GAUGE ENGINE COOLANT TEMPERATURE SENSOR GRY/GRN WIRE GRY/RED WIRE HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED INSTRUMENT CLUSTER LO COOLANT LEVEL IND CTRL LOGIC LOW REF RLY SPD SIG SERIAL DATA SPD SIG UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLK WIRE

6.0L BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BRAKE PEDAL POSITION SENSOR (BEHIND BRAKE PEDAL ASSEMBLY) BRN/BLU WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE ECM IGN FUSE EXCEPT 6.0L FUEL PUMP PRIME FUSE GRN WIRE GRY WIRE GRY/GRN WIRE GRY/RED WIRE HOT W/ ENGINE CONTROL MODULE WAKE-UP RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT PANEL JUNCTION BLOCK LOGIC RED WIRE UNDERHOOD FUSE BLOCK VIO/GRN WIRE VIO/LT GRN WIRE WHT WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE

BATTERY FUSE BLOCK BLK WIRE BRN/VIO WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR- VIEW MIRROR FUSE 2 GRN WIRE HOT AT ALL TIMES HTD MIR FUSE HVAC CONTROL MODULE (BEHIND THE UPPER GLOVE BOX) INFO DISPLAY MODULE J124 (EXCEPT 6.6L) J123 (6.6L) LOGIC LOW SPEED GMLAN SERIAL DATA LT GRN WIRE PASSENGER OUTSIDE REAR VIEW MIRROR PASSENGER OUTSIDE REAR VIEW MIRROR GLASS POWER DISTRIBUTION SYSTEM REAR DEFOG FUSE REAR DEFOGGER GRID REAR DEFOGGER IND REAR DEFOGGER RELAY REAR DEFOGGER RLY CTRL REAR DEFOGGER SWITCH RED/GRN WIRE RED/YEL WIRE UNDERHOOD FUSE BLOCK

A/C CMPRSR MDL/BATT RVC FUSE B+ VOLT BASE EQUIPMENT BLK WIRE BLK/WHT WIRE BLU/YEL WIRE BRN WIRE COMBINED VEHICLE INERTIAL SENSOR SUPPLY VOLT COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/YEL WIRE DK GRN WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE EXCEPT BASE EQUIPMENT GROUND GRY/GRN WIRE HI SPD GMLAN SERIAL DATA (-) (1) HI SPD GMLAN SERIAL DATA (-) (2) HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT PRESSURE SENSOR LOGIC LOW REF LOW SPD GMLAN SERIAL DATA 2 LT GRN/BRN WIRE NCA WIRE POWER STEERING CONTROL MODULE (ON POWER STEERING RACK ASSEMBLY) POWER STEERING PRESSURE SENSOR RED WIRE RED/WHT WIRE RIGHT PRESSURE SENSOR SERIAL DATA COMMUNICATION ENABLE SIGNAL GROUND STEERING SOL CONTROL STEERING SOL LOW REF STEERING WHEEL ANGLE SENSOR UNDERHOOD FUSE BLOCK VARIABLE POWER STEERING SOLENOID VALVE WHT WIRE WHT/DK BLU WIRE

BLK WIRE CHEVROLET DOOR HANDLE FLOOD LAMP DRIVER BACK SEAT BLOWER MOTOR DRIVER BACK SEAT HEATING ELEMENT DRIVER CUSHION SEAT BLOWER MOTOR DRIVER CUSHION SEAT HEATING ELEMENT DRIVER DOOR LATCH ASSEMBLY DRIVER DOOR LOCK SWITCH DRIVER LEFT REAR SEAT HAPTIC MOVEMENT MOTOR DRIVER OUTSIDE REAR VIEW MIRROR CARGO LAMP DRIVER OUTSIDE REAR VIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR- VIEW MIRROR DRIVER RIGHT REAR SEAT HAPTIC MOVEMENT MOTOR DRIVER SEAT ADJUSTER SWITCH DRIVER WINDOW MOTOR DRIVER WINDOW SWITCH GMC GMC/ CHEVROLET HORN LEFT FRONT FOG LAMP LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP HIGH BEAM CONTROL MODULE LEFT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE LEFT HIGH BEAM HEADLAMP LEFT LOW BEAM HEADLAMP LEFT LOWER PARK/ TURN SIGNAL LAMP LEFT MIDDLE SIDE MARKER LAMP LEFT PARK/ TURN SIGNAL LAMP LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LEFT TURN SIGNAL REPEATER LAMP LEFT UPPER PARK/ TURN SIGNAL LAMP OUTSIDE REAR VIEW MIRROR SWITCH RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP HIGH BEAM CONTROL MODULE RIGHT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP RIGHT LOWER PARK/ TURN SIGNAL LAMP RIGHT PARK/ TURN SIGNAL LAMP RIGHT UPPER PARK/ TURN SIGNAL LAMP SEAT MEMORY CONTROL MODULE UNDERHOOD FUSE BLOCK W/ COLOR LIGHT SENSITIVE W/ FRONT SEAT HEATER W/ LANE DEPARTURE WARNING W/ MEMORY W/ POWER OPERATED WINDOW W/ SALES PACKAGE W/O COLOR LIGHT SENSITIVE W/O DRIVER, PASSENGER FRONT SEAT HEATER W/O MEMORY W/O POWER OPERATED WINDOW WINDSHIELD WASHER FLUID LEVEL SWITCH WINDSHIELD WASHER PUMP WINDSHIELD WASHER PUMP RELAY DIODE

6.0L 6.0L (VIN B) AUXILIARY BATTERY AUXILIARY BATTERY RELAY 1 AUXILIARY BATTERY RELAY 2 BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE COOLING FAN CONTROL MODULE ENGINE CONTROL MODULE ENGINE COOLANT LEVEL SWITCH FROM RIGHT HEADLAMP ASSEMBLY (DIAGRAM 2 OF 6) FRONT AXLE ENGAGEMENT ACTUATOR FUEL PUMP RELAY GLOW PLUG CONTROL MODULE HOOD AJAR SWITCH IGNITION COIL 1 IGNITION COIL 2 IGNITION COIL 3 IGNITION COIL 4 IGNITION COIL 5 IGNITION COIL 6 IGNITION COIL 7 IGNITION COIL 8 IGNITION MAIN RELAY INSTRUMENT PANEL JUNCTION BLOCK MULTI-FUNCTION INTAKE AIR SENSOR NITROGEN OXIDES SENSOR 1 POWER TAKE OFF (PTO) CONTROLS POWER TAKE-OFF CONTROL MODULE REAR DEFOGGER RELAY REDUCTANT CONTROL MODULE RIGHT FRONT FOG LAMP SECONDARY FUEL PUMP RELAY STARTER RELAY STOP LAMP RELAY TRAILER BACKUP LAMPS RELAY TRANSFER CASE CONTROL MODULE TRANSFER CASE SHIFT CONTROL SWITCH TRANSMISSION CONTROL MODULE TURBOCHARGER VANE POSITION ACTUATOR UNDERHOOD FUSE BLOCK WHT WIRE WINDSHIELD WASHER PUMP RELAY WINDSHIELD WIPER MOTOR WINDSHIELD WIPER RELAY

BATTERY FUSE BLOCK BLK WIRE BODY CONTROL MODULE BRN WIRE BRN/WHT WIRE FUSE 2 GRN WIRE GRN/WHT WIRE GRY WIRE HORN HORN FUSE HORN RELAY HORN RLY CTRL HORN SW SIG HORN SWITCH HOT AT ALL TIMES POWER DISTRIBUTION SYSTEM RED WIRE STEERING WHEEL AIR BAG COIL UNDERHOOD FUSE BLOCK WHT WIRE YEL WIRE

4.3L/ 5.3L 6.0L 6.0L 6.6L A/C CLUTCH RLY CTRL A/C COMPRESSOR CLUTCH RELAY A/C PRESS 5 VOLT REF 1 A/C REFRIGERANT PRESS SENS LO REF A/C REFRIGERANT PRESS SENS SIG A/C REFRIGERANT PRESSURE SENSOR AC CLTCH FUSE AMBIENT AIR TEMP SENS LOW REF AMBIENT AIR TEMPERATURE SENSOR AMBT AIR TEMP SENS SIG B+ VOLT BATT POS VOLT BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/WHT WIRE BLU WIRE BLU/GRY WIRE BLU/VIO WIRE BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COOL FAN 1 FUSE COOL FAN 2 FUSE COOL FAN CLTCH FUSE COOLING FAN 5 VOLT REF COOLING FAN CONTROL MODULE (6.6L) COOLING FAN LOW REF COOLING FAN RELAY COOLING FAN SPEED SIG CTRL SIG DK BLU WIRE DK BLU/GRY WIRE ENG COOLANT TEMP SENS SIG ENGINE CONTROL MODULE ENGINE CONTROLS IGNITION RELAY ENGINE COOLANT TEMPERATURE SENSOR GRN WIRE GRY WIRE GRY/RED WIRE HI COOLING FAN RLY CTRL HI SPD COOLING FAN RLY CTRL HI SPD GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES LEFT COOLING FAN MOTOR (4.3L, 5.3L) LO REF LOGIC B+ LOW REF MIRROR AMBIENT AIR TEMPERATURE SENSOR PASSENGER OUTSIDE REAR VIEW MIRROR RED/BRN WIRE RED/GRY WIRE RED/WHT WIRE RIGHT COOLING FAN MOTOR (4.3L, 5.3L) RLY SPD SIG SIG GND OUTSIDE AMBIENT AIR SENS SIG OUTSIDE AMBIENT AIR TEMP SENS LOW REF SPD SIG TCM/ECM FUSE UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLK WIRE WHT/GRY WIRE