GMC Sierra III facelift (2015-2018) computer data lines system Wiring diagrams

BATTERY BATTERY FUSE BLOCK BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) BRN WIRE CHARGE IND CTRL CHARGE INDICATOR COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER INFORMATION CENTER DISPLAY ECM IGN FUSE ENGINE CONTROL MODULE FUSE 2 GENERATOR GENERATOR FUSE HOLDER GENERATOR SIG GRN WIRE GRY WIRE GRY/GRN WIRE HOT W/ IGNITION MAIN RELAY ENERGIZED I/P BEC 1 FUSE INSTRUMENT PANEL JUNCTION BLOCK IPC FUSE LEFT INSTRUMENT PANEL FUSE BLOCK LOGIC INSTRUMENT CLUSTER LOW SPEED GM LAN SERIAL DATA LT GRN WIRE RED WIRE RED/GRY WIRE RUN/CRANK IGN 1 VOLT SERIAL DATA (-) (1) SNOW PLOW FUSE BLOCK (IF EQUIPPED) SNOW PLOW FUSE HOLDER SNOW PLOW RELAY STARTING CIRCUIT UNDERHOOD FUSE BLOCK VIO WIRE VIO/LT GRN WIRE WHT WIRE WHT/BLU WIRE YEL WIRE

4.3L, 5.3L, 6.2L 6.0L 4.3L/ 5.3L 6 SPEED 8 SPEED 6.0L 4.3L, 5.3L, 6.2L 6.0L 8 SPEED AUTOMATIC TRANSMISSION ASSEMBLY AUTOMATIC TRANSMISSION ASSEMBLY (6 SPEED) BATTERY BATTERY CURRENT SENSOR BATTERY FUSE BLOCK BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) CHARGING CIRCUIT COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU WIRE ECM IGN FUSE ENGINE CONTROL MODULE FUEL PUMP PRIME FUSE FUSE 2 GMLAN SERIAL DATA - 1 GRY WIRE HIGH SPEED GMLAN SERIAL DATA (-) (1) HOT W/ ENGINE CONTROL MODULE WAKEUP RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED IGN KEY SIG IGNITION SWITCH J126 (4.3L, 5.3L) J125 (6.0L) LOW REF OFF OFF/RUN/ CRANK VOLT RED WIRE RED/GRN WIRE RED/YEL WIRE RUN WIRE RUN/CRANK IGN 1 VOLT SIG GND STARTER ENABLE RELAY CTRL STARTER MOTOR STARTER RELAY STRTR FUSE TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH TRANSMISSION PARK/ NEUTRAL SIG 1 UNDERHOOD FUSE BLOCK VIO/GRN WIRE VIO/LT GRN WIRE WHT WIRE WHT/BLK WIRE WHT/GRY WIRE WHT/VIO WIRE YEL WIRE YEL/BLK WIRE

ACC WAKEUP SER DATA BATT POSITIVE VOLT BLK/BRN WIRE BLK/WHT WIRE BLU/GRY WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) BRN WIRE BRN/WHT WIRE CLUTCH A CTRL CLUTCH B CTRL CLUTCH C CTRL CLUTCH G CTRL COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER INFORMATION CENTER ASSEMBLY DRIVER SIG 1 DRIVER SIG 2 GRY WIRE GRY/BRN WIRE GRY/DK BLU WIRE GRY/GRN WIRE GRY/WHT WIRE HI SPD SER DATA (-) 1 HI SPD SER DATA (-) 1 PRNDL P SIG HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INPUT SPD SIG LO SPD GMLAN SER DATA 2 LOGIC INSTRUMENT CLUSTER LT GRN/BLK WIRE LT GRN/GRY WIRE LT GRN/VIO WIRE LT GRN/YEL WIRE NCA WIRE OUTPUT SPD SIG POWER DISTRIBUTION SYSTEM PPL/GRY WIRE PRESS SW SIG BIT 1 PRESS SW SIG BIT 2 PRESS SW SIG BIT 3 PRESS SW SIG BIT 4 PRNDL A SIG PRNDL B SIG PRNDL C SIG RED/GRN WIRE RUN/CRANK IGN 1 VOLT SENS LO REF SHIFT SOL CTRL 5 SHIFT SOL VALVE CTRL 1 SHIFT SOL VALVE CTRL 2 SIG GND SW PERFORMANCE SIG TAP UP/TAP DOWN SW SIG TCM/ ECM FUSE TEMPERATURE SENS SIG TOW/ HAUL IND TOW/ HAUL MODE SWITCH TRANS IGN FUSE TRANSMISSION CONTROL MODULE TRANSMISSION MANUAL SHIFT SWITCH TRANSMISSION SHIFT LEVER UNDERHOOD FUSE BLOCK VIO/BLK WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/LT GRN WIRE YEL/BLK WIRE YEL/DK BLU WIRE YEL/LT GRN WIRE

AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE GRY WIRE GRY/BRN WIRE GRY/DK BLU WIRE GRY/WHT WIRE HI SPD SER DATA (-) 1 LINE PRESSURE CONTROL SOLENOID VALVE LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/GRY WIRE LT GRN/VIO WIRE LT GRN/YEL WIRE ORG/ WIRE PARK/NEUTRAL SIG (1) PNK WIRE PNK/BLK WIRE PPL PPL/BLK WIRE PPL/GRY WIRE PRESSURE CONTROL SOLENOID VALVE 1 PRESSURE CONTROL SOLENOID VALVE 2 RED WIRE RED/BLK WIRE SHIFT SOLENOID VALVE 1 SHIFT SOLENOID VALVE 2 SHIFT SOLENOID VALVE 3 TAN WIRE TAN/WHT WIRE TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID VALVE TRANSMISSION ASSEMBLY TRANSMISSION FLUID PRESSURE SWITCH TRANSMISSION FLUID TEMPERATURE SENSOR TRANSMISSION INTERNAL MODE SWITCH TRANSMISSION TURBINE SPEED SENSOR VEHICLE SPEED SENSOR VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/GRY WIRE WHT/LT GRN WIRE YEL WIRE YEL/BLK WIRE YEL/DK BLU WIRE YEL/LT GRN WIRE

AIR CONDITIONING SYSTEM AMBIENT LIGHT SENS SIG AMBIENT LIGHT/ SUNLOAD SENSOR BATTERY FUSE BLOCK BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/VIO WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE FOG LAMP FUSE FOG LAMP RLY CTRL FOG LAMP SW SIG FRONT FOG LAMP RELAY FUSE 2 GMC/ CHEVROLET GMLAN SERIAL DATA GRN/BRN WIRE GRN/GRY WIRE GRY/BLU WIRE HDLP DIMMER SW HI BEAM SIG HDLP HI BEAM RLY CTRL HDLP RT/LT FUSE HDLP SW ON SIG HDLP OFF SIG CTRL HDLP SW PARK LP SIG HEADLAMP HIGH BEAM RELAY HOT AT ALL TIMES HVAC CONTROL MODULE LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP HIGH BEAM CONTROL MODULE LEFT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE LEFT HIGH BEAM HEADLAMP LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LEFT LOWER PARK/TURN SIGNAL LAMP LEFT PARK DAYTIME RUNNING LAMP LEFT UPPER PARK/TURN SIGNAL LAMP LF DRL SPLY VOLT LOGIC LOW REF LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE PARK BRAKE SW SIG PNK WIRE POS VOLT POWER DISTRIBUTION SYSTEM PPL RED WIRE RED/DK BLU WIRE RED/GRN WIRE RED/GRY WIRE RF DRL SPLY VOLT RH HDLP LOW BEAM SPLY VOLT LH HDLP LO BEAM SPLY VOLT HDLP SW FLASH TO PASS SIG TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLU WIRE WHT/VIO WIRE YEL WIRE YEL/BRN WIRE

AUTO BCM 3 FUSE BCM 4 FUSE BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER INFORMATION CENTER DISPLAY FOG LAMP SW FRONT FOG LAMP IND GRN/BRN WIRE GRN/GRY WIRE GROUND HEAD HEADLAMP SWITCH HIGH BEAM IND HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT PANEL JUNCTION BLOCK IPC FUSE LEFT FRONT FOG LAMP LEFT INSTRUMENT PANEL FUSE BLOCK LOGIC LOW SPD GMLAN SER DATA LT BLU WIRE LT GRN WIRE NCA WIRE OFF ORG/ WIRE PARK PARK BRAKE SWITCH PNK WIRE PPL RED WIRE RED/DK BLU WIRE RED/GRY WIRE RIGHT FRONT FOG LAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP HIGH BEAM CONTROL MODULE RIGHT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE RIGHT HIGH BEAM HEADLAMP RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT INSTRUMENT PANEL FUSE BLOCK RIGHT LOW BEAM HEADLAMP RIGHT LOWER PARK/TURN SIGNAL LAMP RIGHT PARK DAYTIME RUNNING LAMP RIGHT UPPER PARK/TURN SIGNAL LAMP VIO WIRE W/ BASE EQUIPMENT W/O BASE EQUIPMENT WHT WIRE WHT/VIO WIRE YEL WIRE

ACCY/RUN CRNK FUSE BATT POSITIVE VOLT BLK WIRE BLK/WHT WIRE BLU/BRN WIRE BLU/GRY WIRE BRN WIRE BRN/GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE ENABLE SIG ENG SHUTDOWN SIG ENGINE CONTROL MODULE GRN/WHT WIRE HI SPD SER DATA (-) 1 HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT PANEL MULTI- FUNCTION SWITCH LEFT INSTRUMENT PANEL FUSE BLOCK MISC IGN FUSE POWER DISTRIBUTION SYSTEM POWER TAKE OFF SWITCH DIODE POWER TAKE-OFF CONTROL MODULE PWR TAKE OFF CTRL SW RED/BLU WIRE RED/VIO WIRE REMOTE ENG ST SW SIG REMOTE SW SET SIG 1 RIGHT INSTRUMENT PANEL FUSE BLOCK RLY COIL CTRL RLY ENGAGE SIG SER DATA ENABLE SIG GND STATUS SIG SW NORMALLY CLOSED SIG UNDERHOOD FUSE BLOCK VIO/BLU WIRE VIO/LT GRN WIRE VIO/WHT WIRE WHT WIRE WHT/DK BLU WIRE WHT/GRN WIRE YEL WIRE

2 HI IND CTRL 4 HI IND CTRL 4 LO IND CTRL 5 VOLT REF ACC WAKEUP SERIAL DATA ACCY/ RUN CRNK FUSE BATT + BLK WIRE BLU/GRY WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER INFORMATION CENTER ASSEMBLY FRONT AXLE ENGAGEMENT ACTUATOR FT AXLE ACTUATOR CTRL GMLAN SERIAL DATA - 1 GRN/BLK WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INCREMENTAL ENCDR SENS RTN INCREMENTAL ENCDR SENS SPLY INCRMT ENCODER DIR SIG INSTRUMENT CLUSTER INSTRUMENT PANEL JUNCTION BLOCK J102 (6.6L TURBO DIESEL) J123 (6.6L TURBO DIESEL) J124 (6.0L) LEFT INSTRUMENT PANEL FUSE BLOCK LOGIC LOW SPD GMLAN SERIAL DATA 2 MTR CLOCKWISE CTRL MTR COUNTER CLOCKWISE CTRL NEUTRAL IND CTRL RED/GRY WIRE ROTARY POS IMPULSE SIG RUN/CRANK IGN 1 VOLT TRANS IGN FUSE TRANSFER CASE CONTROL MODULE UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/GRN WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/GRN WIRE YEL WIRE YEL/GRY WIRE YEL/VIO WIRE YEL/WHT WIRE

2 HI 4 HI 2-HI IND 4 LO 4-HI IND 4-LO IND BCM 2 FUSE BLK WIRE BLU/GRY WIRE BLU/YEL WIRE BODY CONTROL MODULE BRN WIRE BRN/BLK WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE GRN/BLK WIRE GRY/RED WIRE HOT AT ALL TIMES IGN 3 ILL NEUTRAL IND POWER DISTRIBUTION SYSTEM RED/BRN WIRE RED/GRY WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK SERIAL DATA (-) (1) TRANSFER CASE MOTOR TRANSFER CASE SHIFT CONTROL SWITCH VIO WIRE VIO/BRN WIRE VIO/GRN WIRE VIO/WHT WIRE WHT WIRE WHT/GRN WIRE YEL WIRE YEL/GRY WIRE YEL/VIO WIRE

A/C COMPRESSOR CLUTCH RELAY ACTIVE GRILLE AIR SHUTTER 1 MOTOR MODULE BATT POS VOLT BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/GRY WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU/BLK WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DATA (-) (3) DK BLU WIRE DK BLU/BLK WIRE DK BLU/WHT WIRE ECM FUSE ECM IGN FUSE ENG FUSE ENGINE CONTROL MODULE WAKEUP RELAY ENGINE CONTROLS IGNITION RELAY ENGINE COOLANT TEMPERATURE SENSOR FPPM FUSE FUEL COMPOSITION SENSOR FUEL PRESSURE SENSOR FUEL PUMP DRIVER CONTROL MODULE (MOUNTED TO BRACKET ABOVE SPARE TIRE) FUEL PUMP PRIME FUSE GRN WIRE GRN/VIO WIRE GRY WIRE GRY/BRN WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN 1 VOLT IGNITION COIL 8 INJ A ODD FUSE INJ B EVEN FUSE LOGIC LOW REF NCA WIRE OUT SIG POWER DISTRI- BUTION SYSTEM PPL/LT GRN WIRE RED WIRE RED/BRN WIRE RED/GRN WIRE RED/LT GRN WIRE RED/VIO WIRE SER DATA SHIELD SIG SPARK PLUG SPLY SPLY VOLT TCM/ ECM FUSE THROT CONT FUSE UNDERHOOD FUSE BLOCK VIO/BLU WIRE VIO/DK BLU WIRE VIO/GRN WIRE VIO/LT GRN WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/RED WIRE YEL WIRE YEL/WHT WIRE