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

2.7L TURBO EXCEPT 2.7L TURBO, 3.0L TURBO DIESEL 3.0L TURBO DIESEL 5.3L, 6.2L A/C COMPRESSOR CLUTCH RELAY A/C COMPRESSOR CLUTCH RELAY CTRL A/C REFRIGERANT PRESSURE SENS SIG AIR COOLANT TEMPERATURE SIGNAL AUXILIARY HEATER COOLANT PUMP RELAY BATTERY POSITIVE VOLTAGE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/YEL WIRE CABIN HEATER COOLANT MOTOR CTRL CHARGE AIR COOLER INLET TEMPERATURE SENSOR CHARGE AIR COOLER OUTLET TEMPERATURE SENSOR COMPUTER DATA LINES SYSTEM COOL DIVERTER VAL ACT CTRL HI COOL DIVERTER VAL ACT CTRL LOW COOL DIVERTER VAL POS SENS LOW REF COOLANT TEMP SENS 2 SIG ENGINE BLOCK COOLANT TEMP SIG ENGINE CONTROL MODULE (BEHIND LEFT HEADLAMP ASSEMBLY) ENGINE CONTROLS IGNITION RELAY ENGINE COOLANT TEMP SENS 3 SIG ENGINE COOLANT TEMP SENS SIG ENGINE COOLANT TEMPERATURE SENSOR ENGINE COOLANT TEMPERATURE SENSOR 7 ENGINE CTRL SENS 5 VOLT REF (2) ENGINE CTRL SENS 5 VOLT REF 1 ENGINE CTRL SENS LOW REF (3) ENGINE CTRL SENS LOW REF 1 ENGINE CTRL SENS LOW REF 2 ENGINE CTRL VEHICLE SENS LOW REF 1 ENGINE INLET COOLANT TEMP SIG ENGINE OUTLET COOLANT TEMP SIG GRN WIRE GRY/VIO WIRE HEATER CORE INLET TEMP SIG HEATER CORE OUTLET TEMP SIG HI SPD GMLAN SERIAL DATA (+) (3) HIGH SPEED COOLING FAN RELAY CTRL HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INLET TEMPERATURE SENSOR SIGNAL OUTSIDE AMBIENT AIR TEMP SENS SIG RED WIRE RED/BRN WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE SIGNAL GROUND TEMPERATURE SENSOR 1 LOW REF TEMPERATURE SENSOR LOW REFERENCE UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLU WIRE VIO/YEL WIRE WHT/GRY WIRE WHT/RED WIRE YEL/BLK WIRE YEL/BLU WIRE

2.7L TURBO 3.0L TURBO DIESEL A/C REFRIGERANT PRESSURE SENSOR AUXILIARY UNDERHOOD FUSE BLOCK BATTERY FUSE BLOCK BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN WIRE BRN/GRY WIRE BRN/YEL WIRE CHARGE AIR COOLER COOLANT PUMP CHARGE AIR COOLER COOLANT PUMP RELAY COMPUTER DATA LINES SYSTEM ENGINE COOLANT TEMPERATURE SENSOR 2 ENGINE COOLANT TEMPERATURE SENSOR 3 ENGINE COOLANT TEMPERATURE SENSOR 4 GRN WIRE GRN/VIO WIRE GRY WIRE GRY/VIO WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED RADIATOR COOLANT TEMPERATURE SENSOR RED WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLU WIRE WHT/RED WIRE YEL/BLK WIRE YEL/BLU WIRE

6.6L DIESEL AUXILIARY BATTERY AUXILIARY BATTERY FUSE BLOCK AUXILIARY GENERATOR BATTERY BATTERY CURRENT SENSOR BATTERY FUSE BLOCK BATTERY POSITIVE VOLTAGE BLK WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/VIO WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRN WIRE CHARGE IND CTRL CHARGE INDICATOR COMPUTER DATA LINES SYSTEM CURRENT SENSOR LOW REF CURRENT SENSOR SIG DRIVER INFORMATION CENTER DISPLAY DUTY CYCLE SIG ENGINE CONTROL MODULE GENERATOR GRN WIRE GROUND CURRENT SENSOR VOLT REF GRY WIRE GRY/GRN WIRE GRY/VIO WIRE HIGH SPEED GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED J112 (6.6L DIESEL) J158 (6.6L) LOGIC INSTRUMENT CLUSTER LOW SPEED GMLAN SERIAL DATA ORG/ WIRE RED WIRE RED/GRN WIRE RED/GRY WIRE RED/YEL WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK RUN/CRANK IGN 1 VOLT SERIAL DATA (-) 7 SNOW PLOW FUSE BLOCK (IF EQUIPPED) (RIGHT FRONT OF ENGINE COMPT) SNOW PLOW FUSE HOLDER SNOW PLOW RELAY UNDERHOOD FUSE BLOCK VIO WIRE VIO/GRN WIRE W/ SNOW PLOW PROVISIONS W/O SNOW PLOW PROVISIONS WHT WIRE WHT/YEL WIRE YEL WIRE

BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE COAX COAX BU DISPLAY DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR- VIEW MIRROR GRN/WHT WIRE HOT W/ IGNITION MAIN RELAY ENERGIZED HOT W/ TRAILER BACKUP LAMP RELAY ENERGIZED INSIDE REAR VIEW MIRROR LOGIC MIRROR DIMMING NCA WIRE PASSENGER OUTSIDE REAR VIEW MIRROR PASSENGER OUTSIDE REAR VIEW MIRROR GLASS RIGHT INSTRUMENT PANEL FUSE BLOCK UNDERHOOD FUSE BLOCK VIDEO DISPLAY INSIDE REAR VIEW MIRROR CAMERA VIO/WHT WIRE YEL/WHT WIRE

BATTERY FUSE BLOCK BLK WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRN WIRE BRN/WHT WIRE GRN WIRE GRN/WHT WIRE GRY WIRE HORN HORN RELAY HORN RLY CTRL HORN SW SIG HOT AT ALL TIMES RED WIRE STEERING WHEEL AIR BAG COIL UNDERHOOD FUSE BLOCK WHT WIRE YEL WIRE

2.7L TURBO EXCEPT 2.7L TURBO, 3.0L TURBO DIESEL 3.0L TURBO DIESEL 5.3L, 6.2L A/C COMPRESSOR CLUTCH RELAY A/C COMPRESSOR CLUTCH RELAY CTRL A/C REFRIGERANT PRESSURE SENS SIG AIR COOLANT TEMPERATURE SIGNAL AUXILIARY HEATER COOLANT PUMP RELAY BATTERY POSITIVE VOLTAGE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/YEL WIRE CABIN HEATER COOLANT MOTOR CTRL CHARGE AIR COOLER INLET TEMPERATURE SENSOR CHARGE AIR COOLER OUTLET TEMPERATURE SENSOR COMPUTER DATA LINES SYSTEM COOL DIVERTER VAL ACT CTRL HI COOL DIVERTER VAL ACT CTRL LOW COOL DIVERTER VAL POS SENS LOW REF COOLANT TEMP SENS 2 SIG ENGINE BLOCK COOLANT TEMP SIG ENGINE CONTROL MODULE (BEHIND LEFT HEADLAMP ASSEMBLY) ENGINE CONTROLS IGNITION RELAY ENGINE COOLANT TEMP SENS 3 SIG ENGINE COOLANT TEMP SENS SIG ENGINE COOLANT TEMPERATURE SENSOR ENGINE COOLANT TEMPERATURE SENSOR 7 ENGINE CTRL SENS 5 VOLT REF (2) ENGINE CTRL SENS 5 VOLT REF 1 ENGINE CTRL SENS LOW REF (3) ENGINE CTRL SENS LOW REF 1 ENGINE CTRL SENS LOW REF 2 ENGINE CTRL VEHICLE SENS LOW REF 1 ENGINE INLET COOLANT TEMP SIG ENGINE OUTLET COOLANT TEMP SIG GRN WIRE GRY/VIO WIRE HEATER CORE INLET TEMP SIG HEATER CORE OUTLET TEMP SIG HI SPD GMLAN SERIAL DATA (+) (3) HIGH SPEED COOLING FAN RELAY CTRL HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INLET TEMPERATURE SENSOR SIGNAL OUTSIDE AMBIENT AIR TEMP SENS SIG RED WIRE RED/BRN WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE TEMPERATURE SENSOR 1 LOW REF TEMPERATURE SENSOR LOW REFERENCE UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLU WIRE VIO/YEL WIRE WHT/GRY WIRE WHT/RED WIRE YEL/BLK WIRE YEL/BLU WIRE

2.7L TURBO 3.0L TURBO DIESEL A/C REFRIGERANT PRESSURE SENSOR AUXILIARY UNDERHOOD FUSE BLOCK BATTERY FUSE BLOCK BLK WIRE BLK/BLU WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/RED WIRE BRN WIRE BRN/GRY WIRE BRN/YEL WIRE CHARGE AIR COOLER COOLANT PUMP CHARGE AIR COOLER COOLANT PUMP RELAY COMPUTER DATA LINES SYSTEM ENGINE COOLANT TEMPERATURE SENSOR 2 ENGINE COOLANT TEMPERATURE SENSOR 3 ENGINE COOLANT TEMPERATURE SENSOR 4 GRN WIRE GRN/VIO WIRE GRY WIRE GRY/VIO WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED NCA WIRE RADIATOR COOLANT TEMPERATURE SENSOR RED WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE RIGHT COOLING FAN MOTOR UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLU WIRE WHT/RED WIRE YEL/BLK WIRE YEL/BLU WIRE

2.7L TURBO 3.0L TURBO DIESEL 4.3L/ 5.3L 5.3L, 6.2L 6.2L AUTO STOP START SWITCH SIGNAL BATTERY BATTERY CURRENT SENSOR BATTERY SENSOR MODULE BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/GRN WIRE BODY CONTROL MODULE (LEFT END OF DASH) COMPUTER DATA LINES SYSTEM ENGINE CONTROL MODULE (BEHIND LEFT HEADLAMP ASSEMBLY) EXCEPT 4.3L GRN WIRE GRN/BLK WIRE HIGH SPEED GMLAN SERIAL DATA (-) (1) HOT W/ IGNITION MAIN RELAY ENERGIZED IGN MODE SW MODE VOLT IGNITION KEY RESISTOR SIGNAL IGNITION MODE SWITCH IGNITION SWITCH KEYLESS ENTRY CONTROL MODULE (BEHIND LEFT SIDE OF DASH) LEFT INSTRUMENT PANEL CENTER ACCESSORY FUNCTION SWITCH NCA WIRE OFF OFF/RUN/CRANK IGNITION VOLTAGE PASSIVE START SW 2 LOW REF PASSIVE START SW SIG 2 POWER DISTRIBUTION SYSTEM PUSH BUTTON START CHALLENGE ACTIVE SIGNAL RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RIGHT INSTRUMENT PANEL CENTER ACCESSORY FUNCTION SWITCH RUN WIRE RUN/CRANK IGNITION 1 VOLTAGE STARTER MOTOR STARTER PINION SOLENOID ACTUATOR RELAY STARTER PINION SOLENOID RELAY CONTROL STARTER RELAY UNDERHOOD FUSE BLOCK VIO WIRE VIO/GRN WIRE W/ FLEXRIDE MODE SYSTEM W/ START/STOP SYSTEM W/O FLEXRIDE MODE SYSTEM W/O START/STOP SYSTEM WHT WIRE WHT/BLK WIRE WHT/GRY WIRE WHT/VIO WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/GRN WIRE YEL/VIO WIRE

BLK WIRE BLU WIRE BLU/GRY WIRE BRN WIRE BRN/BLU WIRE COMPUTER DATA LINES SYSTEM DRIVER INFORMATION CENTER DISPLAY ETHERNET BUS 7 (-) FRONT AXLE ENGAGEMENT ACTUATOR FRT AXLE ACTR CTRL GEAR POSI SENS LOW REF GND 44 GRN WIRE GRY/BLK WIRE GRY/BLU WIRE HI SPD GMLAN SER DATA (+) 1 HI SPD GMLAN SER DATA (-) 1 ROTARY POS SENS SIG HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INCREMENTAL ENCODER DIR SIG INCREMENTAL ENCODER IMPULSE SIG INCREMENTAL ENCODER SENS LOW REF INSTRUMENT CLUSTER J155 (6.6L TURBO DIESEL) J155 (6.6L) J157 (6.6L TURBO DIESEL) KNOCK SENS SHLD LOGIC NEUTRAL IND CTRL POWER DISTRIBUTION SYSTEM PRIMARY FUSED BATT POS VOLT 13 RED/GRY WIRE SER DATA COMMU ENABLE TRANSFER CASE CONTROL MODULE TRANSFER CASE LOCK SOL VLV CRTL TRANSFER CASE MTR CLOCKWISE CTRL TRANSFER CASE MTR COUNTER CLOCKWISE CTRL TRANSFER CASE MTR SHLD UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/BRN WIRE YEL/GRY WIRE YEL/VIO WIRE YEL/WHT WIRE

BATT POS VOLT BLK WIRE BLK/GRY WIRE BLU WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRN/GRN WIRE BRN/GRY WIRE COMPUTER DATA LINES SYSTEM DRIVER INFORMATION CENTER DISPLAY GRY WIRE GRY/GRN WIRE GRY/VIO WIRE HI LO HOT AT ALL TIMES INSTRUMENT CLUSTER LO WASHER FLUID IND CTRL LOGIC LOW REF MIST MIST HI OFF LO INT INT MTR PARK SW SIG OFF RED WIRE RED/BRN WIRE RED/WHT WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK SERIAL DATA (-) (1) SERIAL DATA 2 TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK VIO WIRE WASHER RLY CTRL WASHER SW SIG WASHER SWITCH WHT WIRE WHT/BLK WIRE WHT/VIO WIRE WINDSHIELD WASHER FLUID LEVEL SWITCH WINDSHIELD WASHER PUMP WINDSHIELD WASHER PUMP RELAY WINDSHIELD WIPER MOTOR WINDSHIELD WIPER MTR RLY COIL SUPPLY VOLT WINDSHIELD WIPER RELAY WINDSHIELD WIPER SPEED CONTROL RELAY WINDSHIELD WIPER SW HI SIG WIPER SW HI SIG WIPER SW LOW SIG WIPER SWITCH YEL/BLU WIRE YEL/BRN WIRE