GMC Sierra IV (2018-2022) computer data lines system 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

6.6L TURBO DIESEL A/C COMPRESSOR CLUTCH RELAY CTRL A/C REFRIGERANT PRESSURE SENSOR A/C SENSOR LOW REFERENCE AMBIENT AIR TEMPERATURE SENSOR SIG BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/VIO WIRE BRAKE POSITION SENSOR SIGNAL BRN/RED WIRE CHARGE AIR COOLER COOLANT PUMP COMPUTER DATA LINES SYSTEM COOLING FAN CLUTCH COOLING FAN SPEED CTRL SIG COOLING FAN SPEED SIG ENGINE CONTROL MODULE ENGINE CONTROL SENSORS LOW REF 2 ENGINE COOLANT TEMPERATURE IND ENGINE COOLANT TEMPERATURE SENSOR GMLAN SERIAL DATA (+) 7 GMLAN SERIAL DATA - 1 GND 4 GRN WIRE GRN/VIO WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER J107 (6.6L) J158 (6.6L) J112 (6.6L DIESEL) LOGIC LOW REFERENCE MIRROR AMBIENT AIR TEMPERATURE SENSOR NCA WIRE RED/GRY WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK SENSOR SIGNAL VIO/BLU WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRY WIRE

AC POWER OUTLET AC POWER OUTLET ENABLE SIG AC POWER OUTLET SW SIG AMBIENT LIGHT SENS SIG ANTI-LOCK BRAKES SYSTEM ANTI-LOCK BRAKES, CRUISE CONTROL, EXTERIOR LIGHTS SYSTEMS ANTI-LOCK BRAKES, HEADLIGHTS, INSTRUMENT CLUSTER SYSTEMS BACKUP LAMP RLY CTRL BATT POSITIVE VOLT BATTERY POSITIVE VOLTAGE BLK WIRE BLK/GRN WIRE BLK/VIO WIRE BLU WIRE BLU/BLK WIRE BLU/BRN WIRE BLU/GRN WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRAKE APPLY SENSOR BRAKE APPLY SENSOR SIG BRN WIRE BRN/BLK WIRE BRN/VIO WIRE BRN/WHT WIRE CARGO LAMP SW SIG COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM CRUISE/ETC/TCC BRAKE SIG CURRENT SENS LOW REF DOOR LOCKS, ANTI-THEFT SYSTEMS ELECTRONIC POWER STEERING SYSTEM POWER DISTRIBUTION SYSTEM EXTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS, INTERIOR LIGHTS SYSTEMS DOOR LOCKS, ANTI-THEFT SYSTEMS FOG LAMP RLY CTRL FRONT FOOTWELL LIGHTING CTRL GMLAN SERIAL DATA GRN WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/WHT WIRE GROUND 18 GRY WIRE GRY/GRN WIRE GRY/WHT WIRE HAZARD SWITCH SIG HEADLAMP SW OFF SIG HEADLAMP SW ON SIG HEADLAMP SW PARK LAMP SIG HEADLAMP SW REF HEADLAMP SW SIG HEADLIGHTS SYSTEM HIGH BEAM RLY CTRL HORN RLY CTRL HORNS SYSTEM HOT AT ALL TIMES IGNITION MODE SW INDICATOR DIMMING CTRL LAMP DISABLE SW SIG LEFT HEADLAMP RELAY CTRL LEFT MINOR ENDGATE LF TURN SIGNAL LAMP CTRL LH TRAILER TURN SIG LAMP CTRL LIN BUS 4 LR STOP/TURN LAMP CTRL MAJOR ENDGATE HI RELAY CTRL MAJOR ENDGATE LOW RELAY CTRL OUT OF PARK SIGNAL PARK LAMP RLY CTRL POWER DISTRIBUTION SYSTEM READING LAMP CONTROL RECEIVER LOW REF RED/BLU WIRE RED/BRN WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE REMOTE FUNCTION ACTR CTRL REMOTE FUNCTION ACTR TRANSMIT SIG RIGHT FRONT DRL CTRL RIGHT INSTRUMENT PANEL FUSE BLOCK RIGHT MINOR ENDGATE RIGHT TRAILER TURN SIG LAMP RUN IGNITION 3 VOLT SECURITY INDICATOR CONTROL SENS LOW REF SERIAL DATA (+) (1) REMOTE FUNC ACTR RECEIVE SIG SERIAL DATA (-) (1) STARTING/CHARGING SYSTEM STEERING COLUMN LK STATUS SIG TASK LAMP SW SIG TRACTION CTRL SW SIG 1 TRAILER BRAKE APPLY SIG TRUNK, TAILGATE, FUEL DOORS SYSTEM VIO/BRN WIRE VIO/GRN WIRE WHT WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/GRN WIRE WHT/GRY WIRE WHT/VIO WIRE WIPER SW HIGH SIG WIPER/WASHER SYSTEM YEL WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/GRN WIRE YEL/GRY WIRE

12 VOLT REFERENCE ACCESSORY VOLT ACCESSORY WAKEUP SER DATA ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM BATT POSITIVE VOLT BATTERY FUSE BLOCK BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/GRY WIRE BLU/VIO WIRE BLU/YEL WIRE BODY CONTROL MODULE (UNDER LEFT SIDE OF DASH) BRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CARGO LAMP CONTROL 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 DOOR LOCK ACTUATOR DOOR LOCK CTRL DOOR LOCK CTRL 2 DOOR LOCK KEY SW UNLOCK SIG DOOR LOCK SW LOCK SIG DOOR LOCK SW UNLOCK SIG DOOR LOCKS, ANTI-THEFT SYSTEMS DOOR LOCKS, ANTI-THEFT, INTERIOR LIGHTS SYSTEMS ELECTRONIC MUFFLERS SYSTEM ENDGATE HIGH RELAY CTRL EXHAUST BRAKE SW INDICATOR EXTERIOR LIGHTS, INTERIOR LIGHTS SYSTEMS GAP UP/DOWN SW SIG GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND GROUND 23 GRY WIRE GRY/BLK WIRE GRY/BLU WIRE GRY/GRN WIRE GRY/VIO 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 HIGH BEAM AUTO ON/OFF SW SIG HOOD STATUS B SIG HORN SW SIG HOT AT ALL TIMES IGNITION KEY RESISTOR SIG IGNITION MODE SW IGNITION SWITCH IMMOBILIZER CTRL IMMOBILIZER LOW REF INADVERTENT POWER CTRL KEY-IN IGNITION SWITCH LED AMBIENT LIGHTING CTRL LED BACK LT DIMMING CTRL LF DOOR AJAR SW SIG LF DRL CTRL LH HDLMP LOW BEAM CTRL LH TAIL LAMP FEEDBACK SIG LIN BUS 1 LIN BUS 2 LIN BUS 3 LIN BUS 5 LOCK CTRL LOCK SOLENOID ACTUATOR CTRL LOW REFERENCE MAJOR ENDGATE RELEASE SW MINOR ENDGATE LOW RELAY MINOR ENDGATE RELEASE SW MIRR CARGO LAMP CTRL OFF OFF/RUN/CRANK VOLT POWER DISTRIBUTION SYSTEM PUDDLE LAMP CONTROL PUDDLE LAMP CTRL RAP RELAY COIL CTRL REAR LICENSE LP CTRL RED/YEL WIRE RF DOOR AJAR SW SIG RF TURN SIG LP CTRL RH DETECTION SIG RH HDLMP LOW BEAM CTRL RR TURN SIG LP CTRL RUN WIRE RUN/CRANK IGNITION 1 VOLT RUN/CRANK RELAY COIL CTRL SERIAL DATA COMM ENABLE SET/COAST/RESUME/ ACCELERATE SW SIG SHIFT INTERLOCK SOLENOID CTRL SHIFT INTERLOCK SYSTEM SHIFT INTERLOCK, MEMORY SYSTEMS SHIFT SELECT SW PARK SIG SHIFT SELECT SW SIG 16 17 TRAILER BRAKE APPLY SIG STANDING LAMP RLY CTRL STARTING/CHARGING SYSTEM STOP LP RLY COIL CTRL SURVEILLANCE SW SIG TAP UP/TAP DOWN SW SIG TRANSMISSIONS SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM UNLOCK CTRL VIO/BLK WIRE VIO/BLU WIRE VIO/GRY WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/GRN WIRE WHT/GRY 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 RELAY COIL CTRL WIPER SW HIGH SIG WIPER/WASHER SYSTEM WIPER/WASHER SYSTEM POWER DISTRIBUTION SYSTEM WIRELESS CHARGER YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/VIO WIRE YEL/WHT 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

+RES -SET 6 SPEED A/T AUTOMATIC TRANSMISSION ASSEMBLY BATT POS VOLT 28 LO SPD GMLAN SERIAL DATA 2 BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/YEL WIRE BRAKE PEDAL POSITION SENSOR (BEHIND BRAKE PEDAL ASSEMBLY) BRN/GRN WIRE BRN/WHT WIRE CANCEL SWITCH COMPUTER DATA LINES SYSTEM CRUISE IND CRUISE SWITCH DRIVER INFORMATION CENTER DISPLAY GAP SWITCH GRN WIRE GRN/VIO WIRE GRN/YEL WIRE GRY/BLU WIRE GRY/GRN WIRE HIGH SPD GMLAN SERIAL DATA (+) 1 HIGH SPD GMLAN SERIAL DATA (-) 2 HOT AT ALL TIMES INPUT SPD SIG INSTRUMENT CLUSTER LEFT STEERING WHEEL CONTROLS SWITCH LOGIC NCA WIRE OUTPUT SPD SIG TRANSMISSON OUTPUT SHAFT RED WIRE RED/GRY WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK STEERING WHEEL AIR BAG COIL (BEHIND THE STEERING WHEEL) TRANSMISSION CONTROL MODULE (10 SPEED A/T) TRANSMISSION INPUT SHAFT SPEED SENSOR TRANSMISSION INTERMEDIATE SPEED SENSOR 1 TRANSMISSION INTERMEDIATE SPEED SENSOR 2 TRANSMISSION OUTPUT SHAFT SPEED SENSOR VIO/GRN WIRE WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE WHT/VIO WIRE YEL WIRE YEL/BLU WIRE YEL/GRN WIRE YEL/ORG WIRE

6.6L TURBO DIESEL A/C COMPRESSOR CLUTCH RELAY CTRL A/C REFRIGERANT PRESSURE SENSOR A/C SENSOR LOW REFERENCE AMBIENT AIR TEMPERATURE SENSOR SIG BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/VIO WIRE BRAKE POSITION SENSOR SIGNAL BRN/RED WIRE CHARGE AIR COOLER COOLANT PUMP COMPUTER DATA LINES SYSTEM COOLING FAN CLUTCH COOLING FAN SPEED CTRL SIG COOLING FAN SPEED SIG ENGINE CONTROL MODULE ENGINE CONTROL SENSORS LOW REF 2 ENGINE COOLANT TEMPERATURE IND ENGINE COOLANT TEMPERATURE SENSOR GMLAN SERIAL DATA (+) 7 GMLAN SERIAL DATA - 1 GND 4 GRN WIRE GRN/VIO WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER J107 (6.6L) J158 (6.6L) J112 (6.6L DIESEL) LOGIC LOW REFERENCE MIRROR AMBIENT AIR TEMPERATURE SENSOR NCA WIRE RED/GRY WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK SENSOR SIGNAL VIO/BLU WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRY 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