GMC Sierra IV (2018-2022) underhood fuse block Wiring diagrams

A/C COMPRESSOR CLUTCH RELAY A/C EVAPORATOR TEMPERATURE SENSOR A/C IND A/C SWITCH AIR INLET DOOR ACTUATOR AIR INLET DOOR STEPPER MOTOR CTRL (1) AIR INLET DOOR STEPPER MOTOR CTRL 2 AIR INLET DOOR STEPPER MOTOR CTRL 3 AIR INLET DOOR STEPPER MOTOR CTRL 4 AIR TEMPERATURE DOOR CTRL LOW REF AUTO AUXILIARY HEATER COOLANT PUMP RELAY BATTERY FUSE BLOCK BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BRN WIRE BLU/GRY WIRE BRN WIRE BRN/GRN WIRE BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COOLING FAN RELAY DISPLAY ENGINE COOLANT FAN SWITCH ENGINE COOLANT TEMPERATURE 2 SWITCH EVAP CORE TEMP SENSOR SIG GRN WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HVAC CONTROL MODULE (BEHIND UPPER LEFT SIDE OF DASH) HVAC CONTROLS HVAC MOTOR CONTROL LEFT AIR TEMPERATURE DOOR ACTUATOR LOGIC LOWER AIR LOWER AIR OUTLET SWITCH MAX WINDSHIELD DEFROST IND MAX WINDSHIELD DEFROST SWITCH MODE DOOR ACTUATOR MODE DOOR STEPPER MOTOR CONTROL (2) MODE DOOR STEPPER MOTOR CONTROL (4) MODE DOOR STEPPER MOTOR CONTROL 1 MODE DOOR STEPPER MOTOR CONTROL 3 OUTLET IND RED/GRY WIRE RED/WHT WIRE RIGHT AIR TEMPERATURE DOOR ACTUATOR START/ STOP SWITCH SYNC TEMP DOOR STEPPER MOTOR CONTROL 1 TEMP DOOR STEPPER MOTOR CONTROL 2 TEMP DOOR STEPPER MOTOR CONTROL 3 TEMP DOOR STEPPER MOTOR CONTROL 4 UNDERHOOD AUXILIARY FUSE BLOCK UNDERHOOD FUSE BLOCK UPPER AIR OUTLET IND UPPER AIR OUTLET SWITCH VIO/BLU WIRE VIO/GRN WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRY WIRE WHT/YEL WIRE WINDSHIELD DEFROST IND WINDSHIELD DEFROST SWITCH YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

AUTOMATIC TRANSMISSION ASSEMBLY (10 SPEED A/T) AUTOMATIC TRANSMISSION ASSEMBLY (6 SPEED A/T) BACKUP LAMP RLY CTRL BATTERY FUSE BLOCK BLK WIRE BLK/GRY WIRE BLU WIRE BLU/BRN WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY ENGINE CONTROL MODULE FEEDBACK SIG GRN WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HIGH SPEED GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES IGN IMS MODE CTRL LEFT BACKUP LAMP LEFT TAIL LAMP ASSEMBLY LOGIC NCA WIRE NEUTRAL SIGNAL ORG/ WIRE RED WIRE RED/YEL WIRE RIGHT BACKUP LAMP RIGHT TAIL LAMP ASSEMBLY SERIAL DATA (-) (1) SIG A SIG B SIG C SIG GND SIG P TRAILER BACKUP LAMPS RELAY TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH TRANSMISSION PARK/ TRANSMISSION RANGE SENSOR UNDERHOOD FUSE BLOCK VOLT SUPPLY A W/ LED W/O LED WHT WIRE WHT/BLU WIRE WHT/GRY WIRE YEL WIRE YEL/BLU WIRE YEL/GRY WIRE

6.6L TURBO DIESEL AUXILIARY HEATER COOLANT PUMP RELAY BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/VIO WIRE CHARGE AIR COOLER COOLANT PUMP COMPUTER DATA LINES SYSTEM COOLING FAN CLUTCH COOLING FAN RELAY COOLING FAN SPEED CTRL SIG COOLING FAN SPEED SIG ENGINE CONTROL MODULE ENGINE COOLANT TEMPERATURE IND ENGINE COOLANT TEMPERATURE SENSOR GMLAN SERIAL DATA (+) 7 GMLAN SERIAL DATA - 1 GND 4 GRN/VIO WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROL IGNITION RELAY ENERGIZED INSTRUMENT CLUSTER J109 (6.6L) J112 (6.6L DIESEL) J158 (6.6L) LOGIC LOW REFERENCE NCA WIRE RED/GRY WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK SENSOR SIGNAL UNDERHOOD AUXILIARY FUSE BLOCK UNDERHOOD FUSE BLOCK VIO/BLU WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE

12 VOLT REF 6.6L (VIN 7) 6.6L VIN Y TURBO DIESEL ACCEL PEDAL POS SIG 1 ACCEL PEDAL POS SIG 2 ACCELERATOR PEDAL POSITION SENSOR ACCL PEDAL POS 5 VOLT REF 1 ACCL PEDAL POS 5 VOLT REF 2 ACCL PEDAL POS LOW REF 1 ACCL PEDAL POS LOW REF 2 ADAP CRUISE CTRL UP/DOWN SW SIG BATT POS VOLT 27 BATT POS VOLT 4 BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRK APPLY SENS LOW REF BRK APPLY SENS SIG BRK APPLY SENS VOLT REF BRK POS SENS LOW REF BRK POS SENS SIG BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM CRUISE CTRL SET/COAST/ RES/ACC SW SIG CRUISE/ETC/TCC BRK SIG ENGINE CONTROL MODULE GRN/WHT WIRE GRY/GRN WIRE HI SPD GMLAN DATA (-) (1) HOT AT ALL TIMES INTAKE AIR FLOW VALVE (6.6L VIN Y TURBO DIESEL) (INLET TO INTAKE MANIFOLD) J108 (6.6L VIN 7) J110 (6.6L VIN 7) J158 (6.6L VIN Y TURBO DIESEL) J112 (6.6L VIN 7) LOGIC RED/BRN WIRE RED/WHT WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK THROTTLE BODY (6.6L VIN 7) (AT INTAKE MANIFOLD INLET) THRTL ACTR CTRL CLOSE THRTL ACTR CTRL OPEN THRTL POS SENS 5 VOLT REF 2 THRTL POS SENS LOW REF THRTL POS SENS SENT 1 SIG UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/WHT WIRE

BASE BASE EQUIPMENT BLK WIRE BLU WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CHEVROLET EXCEPT BASE EXCEPT BASE EQUIPMENT GMC GRN/VIO WIRE GRY WIRE GRY/BRN WIRE HEADLIGHTS SYSTEM PARK LAMPS RELAY RED/GRN WIRE RIGHT FENDER FRONT SIDE MARKER LAMP RIGHT FRONT SIDE MARKER LAMP RIGHT FRONT TURN SIGNAL LAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE RIGHT PARK/ TURN SIGNAL LAMP STOP LAMP RELAY TRAILER TOW CIRCUIT UNDERHOOD FUSE BLOCK VIO/GRY WIRE VIO/WHT WIRE W/ LED W/ SINGLE REAR WHEEL, RIDE, HANDLING CHASSIS W/O LED W/O SINGLE REAR WHEEL, RIDE, HANDLING CHASSIS

BATTERY FUSE BLOCK BLK WIRE BLU WIRE BLU/BRN WIRE BRN WIRE BRN/VIO WIRE BRN/WHT WIRE CHEVROLET FRONT FOG LAMP RELAY GMC GRN/BRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/BLU WIRE HEADLAMP HIGH BEAM RELAY HEADLAMP RELAY HOT AT ALL TIMES LEFT DAYTIME RUNNING LAMP, LEFT HEADLAMP LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE RED/GRN WIRE RIGHT DAYTIME RUNNING LAMP RIGHT HEADLAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE UNDERHOOD FUSE BLOCK VIO/BLK WIRE W/ LED W/O LED WHT WIRE WHT/BRN WIRE WHT/VIO WIRE WHT/YEL WIRE YEL WIRE YEL/BRN WIRE YEL/GRY WIRE

A/C COMPRESSOR CLUTCH RELAY A/C EVAPORATOR TEMPERATURE SENSOR A/C IND A/C SWITCH AIR INLET DOOR ACTUATOR AIR INLET DOOR STEPPER MOTOR CTRL (1) AIR INLET DOOR STEPPER MOTOR CTRL 2 AIR INLET DOOR STEPPER MOTOR CTRL 3 AIR INLET DOOR STEPPER MOTOR CTRL 4 AIR TEMPERATURE DOOR CTRL LOW REF AUXILIARY HEATER COOLANT PUMP RELAY BATTERY FUSE BLOCK BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BRN WIRE BLU/GRY WIRE BRN WIRE BRN/GRN WIRE BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COOLING FAN RELAY ENGINE COOLING FAN SWITCH ENGINE COOLING TEMPERATURE SWITCH EVAP CORE TEMP SENSOR SIG GRN WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HVAC CONTROL MODULE (BEHIND UPPER LEFT SIDE OF DASH) HVAC CONTROLS HVAC MOTOR CONTROL LEFT AIR TEMPERATURE DOOR ACTUATOR LOGIC LOWER AIR LOWER AIR OUTLET SWITCH MAX WINDSHIELD DEFROST IND MAX WINDSHIELD DEFROST SWITCH MODE DOOR ACTUATOR MODE DOOR STEPPER MOTOR CONTROL (2) MODE DOOR STEPPER MOTOR CONTROL (4) MODE DOOR STEPPER MOTOR CONTROL 1 MODE DOOR STEPPER MOTOR CONTROL 3 OUTLET IND RED/GRY WIRE RED/WHT WIRE START/ STOP SWITCH TEMP DOOR STEPPER MOTOR CONTROL 1 TEMP DOOR STEPPER MOTOR CONTROL 2 TEMP DOOR STEPPER MOTOR CONTROL 3 TEMP DOOR STEPPER MOTOR CONTROL 4 UNDERHOOD AUXILIARY FUSE BLOCK UNDERHOOD FUSE BLOCK UPPER AIR OUTLET IND UPPER AIR OUTLET SWITCH VIO/BLU WIRE VIO/GRN WIRE WHT WIRE WHT/BLK WIRE WHT/GRY WIRE WINDSHIELD DEFROST IND WINDSHIELD DEFROST SWITCH YEL WIRE YEL/GRN WIRE

BATT POSITIVE VOLT 45 BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/WHT WIRE BRN/GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM ENABLE SIG ENG SHUTDOWN SIG ENGINE CONTROL MODULE GND 4 GRN/WHT WIRE GRY/GRN WIRE HI SPD SER DATA (-) 1 HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED LEFT INSTRUMENT PANEL FUSE BLOCK POWER DISTRIBUTION SYSTEM POWER TAKE OFF SWITCH DIODE POWER TAKE-OFF AUTOMATIC TRANSMISSION FLUID PRESSURE SENSOR POWER TAKE-OFF CONTROL MODULE POWER TAKE-OFF SHIFT SOLENOID VALVE PRESSURE SENS LOW REF PRESSURE SENS SIG PWR TAKE OFF CTRL SW RED/BLU WIRE RED/VIO WIRE REMOTE THROTTLE SIG RIGHT INSTRUMENT PANEL CENTER ACCESSORY FUNCTION SWITCH RIGHT INSTRUMENT PANEL FUSE BLOCK SER DATA COMM ENABLE SIDE OF TRANSMISSION) SIG PWR SOL CTRL HIGH SOL CTRL LOW SW NORMALLY CLOSED SIG UNDERHOOD FUSE BLOCK UPFIT INTRLK SW SIG 2 VIO/BLK WIRE VIO/GRN WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE YEL WIRE

6.6L DIESEL AUTOMATIC TRANSMISSION ASSEMBLY BATTERY BATTERY FUSE BLOCK BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/GRN WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY ENGINE CONTROL MODULE GMLAN SERIAL DATA - 1 GRN WIRE GRN/BLK WIRE GRY WIRE HIGH SPEED GMLAN SERIAL DATA (+) 7 HOT W/ IGNITION MAIN RELAY ENERGIZED IGN KEY SIG IGN MODE SW SIG 2 IGNITION MODE SW MODE VOLT IGNITION MODE SWITCH IGNITION SWITCH KEYLESS ENTRY CONTROL MODULE (BEHIND LEFT SIDE OF DASH) LOW SPD GMLAN SERIAL DATA OFF OFF/RUN/CRANK VOLT PASSIVE START SW 2 LOW REF POWER DISTRIBUTION SYSTEM RED/GRN WIRE RED/YEL WIRE RUN WIRE RUN/CRANK IGN 1 VOLT STARTER ENABLE RELAY CTRL STARTER MOTOR STARTER RELAY TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH TRANSMISSION PARK/ NEUTRAL SIGNAL 1 UNDERHOOD FUSE BLOCK VIO/GRN WIRE WHT WIRE WHT/BLK WIRE WHT/GRY WIRE WHT/VIO WIRE YEL WIRE YEL/BLK WIRE

5-VOLT REF 1 BLK WIRE BLK/BLU WIRE BLK/GRY WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/GRY WIRE BLU/RED WIRE BLU/WHT WIRE BRN WIRE BRN/BLU WIRE BRN/WHT WIRE CAMSHAFT CAMSHAFT POSITION CHARGE IND CTRL CHARGING CRANKSHAFT POSIT SENS CRANKSHAFT POSITION ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT, NEAR FAN SHROUD) ENGINE CONTROLS IGNITION RELAY ENGINE CTRL SENS EVAPORATIVE EMISSION VENT SOLENOID VALVE GRN WIRE GRN/BLU WIRE GROUND 4 GRY/BLU WIRE HEATED OXYGEN SENS HI SIG BANK 1 SENS (2) HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN CTRL (4) IGN CTRL (8) INTAKE SENS 1 INTAKE SENS 1 VOLT REF KNOCK SENS SIG 1 KNOCK SENS SIG 2 KNOCK SENSOR #2 KNOCK SENSOR 1 LO SIG BANK 1 SENS 2 NCA WIRE PHASER INTAKE SOL 1 POWER DISTRIBUTION SYSTEM POWER MODULE RED/BRN WIRE RED/VIO WIRE RED/WHT WIRE REPLICATED SIGNAL SENS SIG SOUND SPARK PLUG STARTING/ SYSTEM SYSTEMS THROTT ACTR CTRL OPEN TRANSMISSIONS SYSTEM UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLU WIRE VIO/BRN WIRE VIO/GRN WIRE VIO/GRY WIRE W/ TRAILER INFORMATION WAKE UP SIGNAL WHT WIRE WHT/GRY WIRE WHT/RED WIRE WHT/YEL WIRE YEL WIRE YEL/BLU WIRE YEL/VIO WIRE