GMC Sierra III facelift (2015-2018) instrument panel junction block Wiring diagrams

BACKUP LP RLY CTRL BATT POS VOLT BATTERY FUSE BLOCK BCK UP LAMP FUSE BCM 5 FUSE BLK WIRE BLU/BRN WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM DK BLU WIRE FUSE 2 GMC GRN/RED WIRE HI SPD GMLAN SER DATA (+) 1 HOT AT ALL TIMES HUMAN MACHINE INTERFACE CONTROL MODULE BYPASS MODULE INSIDE REAR VIEW MIRROR INSTRUMENT PANEL JUNCTION BLOCK J124 (6.0L VIN G, 6.0L VIN B) J123 (6.6L TURBO DIESEL) LEFT BACKUP LAMP LEFT INSTRUMENT PANEL FUSE BLOCK LEFT LOWER TAIL/STOP, TURN SIGNAL LAMP LEFT REAR SIDE MARKER LAMP LEFT TAIL LAMP ASSEMBLY LEFT UPPER TAIL/STOP, TURN SIGNAL LAMP LOGIC LT GRN WIRE LT GRN/WHT WIRE NCA WIRE REAR VIEW CAMERA RED/BRN WIRE RED/GRN WIRE REV LAMP FUSE RIGHT BACKUP LAMP RIGHT LOWER TAIL/STOP, TURN SIGNAL LAMP RIGHT REAR SIDE MARKER LAMP RIGHT TAIL LAMP ASSEMBLY RIGHT UPPER TAIL/STOP, TURN SIGNAL LAMP TRAILER BACKUP LAMPS RELAY UNDERHOOD FUSE BLOCK W/ BODY EQUIPMENT W/O BODY EQUIPMENT W/ LED W/ SPECIAL EQUIPMENT W/O LED WHT WIRE WHT/LT GRN WIRE

5 VOLT REF 6.0L AUTO OFF BATT POSITIVE VOLT BCM 4 FUSE BCM 6 FUSE BCM 7 FUSE BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) BPP SENS LO REF BPP SENS SIG BRAKE PEDAL POSITION SENSOR BRN/GRN WIRE BRN/WHT WIRE CARGO LAMP SWITCH SIGNAL COIL SPLY VOLT COMPUTER DATA LINES SYSTEM DK BLU WIRE ENGINE CONTROL MODULE GMLAN DATA - (1) GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/GRN WIRE GRY/RED WIRE HAZARD SW HAZARD SW LT TURN SIG HAZARD SW RT TURN SIG HAZARD SWITCH HEAD PARK HEADLAMP SW PARK LAMP SIG HEADLAMP SWITCH HOT AT ALL TIMES INSTRUMENT PANEL JUNCTION BLOCK INSTRUMENT PANEL MULTI- FUNCTION SWITCH LAMP RELAY CONTROL LAMP SPLY VOLT LEFT DETECTION SIG LEFT LICENSE PLATE LAMP LICENSE PLATE LAMP LT GRN/YEL WIRE PARK LAMP RELAY CONTROL PUDDLE LAMP SPLY VOLT RED/BRN WIRE RED/DK BLU WIRE RED/GRY WIRE RED/LT GRN WIRE RED/WHT WIRE RIGHT DETECTION SIG RIGHT INSTRUMENT PANEL FUSE BLOCK RIGHT LICENSE PLATE LAMP SENSOR LO REF SER DATA (-) (1) STOP LAMP SW SIGNAL VIO/BLU WIRE VIO/WHT WIRE VIO/YEL WIRE W/ REAR BUMPER W/O REAR BUMPER BASE EQUIPMENT EXCEPT BASE EQUIPMENT W/O REAR BUMPER WHT WIRE WHT/GRN WIRE YEL/BLK WIRE YEL/BLU WIRE

BACKUP LAMPS CIRCUIT BASE EQUIPMENT BCM 1 FUSE BCM 3 FUSE BCM 5 FUSE BLK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRN WIRE BRN/GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DATA DK GRN WIRE DRIVER INFORMATION CENTER DISPLAY GMLAN GRN/VIO WIRE GRY/BRN WIRE GRY/GRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT PANEL JUNCTION BLOCK IPC FUSE LEFT BACKUP LAMP LEFT INSTRUMENT PANEL FUSE BLOCK LEFT REAR SIDE MARKER LAMP LEFT TAIL LAMP ASSEMBLY LEFT TAIL/STOP, TURN SIGNAL LAMP LEFT TURN IND LO SPD LOGIC LT GRN WIRE LT GRN/WHT WIRE PARKS LAMPS IND POSITIVE RED WIRE RED/BRN WIRE RED/GRY WIRE RED/WHT WIRE RIGHT BACKUP LAMP RIGHT REAR SIDE MARKER LAMP RIGHT TAIL LAMP ASSEMBLY RIGHT TAIL/STOP, TURN SIGNAL LAMP RIGHT TURN IND SER VIO/GRY WIRE VIO/WHT WIRE VIO/YEL WIRE VOLT W/O DRIVER INFO ENHANCED DISPLAY INSTRUMENT YEL/BLK WIRE YEL/BLU WIRE

BATTERY FUSE BLOCK BLK WIRE BLU/WHT WIRE BRN WIRE BRN/WHT WIRE CARGO LAMP FUSE CARGO LAMP RELAY CENTER HIGH MOUNTED STOP LAMP DK BLU WIRE DK GRN WIRE FUSE 8 GMC/ CHEVROLET GROUND DISTRIBUTION SYSTEM HEADLIGHTS SYSTEM HOT AT ALL TIMES INSTRUMENT PANEL JUNCTION BLOCK LEFT FRONT PARK LAMP LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE LEFT LOWER PARK/TURN SIGNAL LAMP LEFT PARK DAYTIME RUNNING LAMP LEFT PARK/TURN SIGNAL LAMP LEFT UPPER PARK/TURN SIGNAL LAMP LT BLU WIRE LT GRN WIRE ORG/ WIRE PNK WIRE PPL RED WIRE RED/LT GRN WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK VIO/GRY WIRE WHT WIRE WHT/VIO WIRE YEL WIRE

AM/FM BK AUX AUDIO COMM SIG AUX AUDIO SCREEN (2) AUX DETECTION SIG AUXILIARY AUDIO INPUT BACKUP LAMP CTRL BATT POS VOLT BLK WIRE BLK/YEL WIRE BLU WIRE BRN WIRE CAMERA LOW REF CAMERA SIG 2 COAX COMPUTER DATA LINES SYSTEM DISPLAY SIG + GRN WIRE GROUND GROUND DISTRIBUTION GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HOT AT ALL TIMES HUMAN MACHINE INTERFACE CONTROL MODULE BYPASS MODULE INFOTAINMENT INSTRUMENT PANEL JUNCTION BLOCK IPC FUSE LEFT INSTRUMENT PANEL FUSE BLOCK LH AUX AUDIO SIG (2) LOGIC LOW REF LT BLU WIRE LT GRN WIRE LT GRN/WHT WIRE LVDS MOST CONTROL MOST SERIAL DATA (+) NAVIGATION SYSTEM NCA WIRE POWER DISTRIBUTION SYSTEM RADIO RADIO ANTENNA RAP RLY COIL CTRL REAR VIEW CAMERA CIRCUIT RED/GRY WIRE RED/VIO WIRE RH AUX AUDIO SIG (2) SERIAL DATA BUS 5 SYSTEM TELEPHONE VOICE SIG USB VIO WIRE W/ FRONT COMPARTMENT FLOOR CUSTOM CONSOLE WHT/BLU WIRE WHT/LT GRN WIRE WHT/VIO WIRE XM/HD CU YEL WIRE

5 VOLT REF 6.2L BASE EQUIPMENT EXCEPT BASE EQUIPMENT BCM 6 FUSE BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM DATA BUS 1 DK BLU WIRE DLIS FUSE GMLAN SERIAL GRY/RED WIRE HI SPEED HI SPEED GMLAN SERIAL DATA (-) 1 HOT AT ALL TIMES IGNITION SWITCH INSTRUMENT PANEL JUNCTION BLOCK KEY-IN SWITCH LEFT INSTRUMENT PANEL FUSE BLOCK LOW REF OFF OFF RUN/CRANK VOLT PPL/BLK WIRE RED/BLU WIRE RED/DK BLU WIRE RED/WHT WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK RUN WIRE SENS LOW REF SERIAL DATA BUS (-) IMS MODE SW RETURN SERIAL DATA BUS- SHIFT INTERLOCK SOL CTRL STOP LAMP SW SIG TRANSMISSION CONTROL MODULE TRANSMISSION FLUID PRESSURE SWITCH TRANSMISSION INTERNAL MODE SWITCH AUTOMATIC TRANSMISSION ASSEMBLY TRANSMISSION SHIFT LOCK CONTROL SOLENOID ACTUATOR WHT WIRE WHT/GRN WIRE WHT/GRY WIRE WHT/VIO WIRE YEL/WHT WIRE

4.3L/ 5.3L 6.2L 6.6L 6.0L 6.2L, 6.6L 4.3L, 5.3L, 6.0L AUTOMATIC TRANSMISSION ASSEMBLY (4.3L, 5.3L, 6.0L) BLK/BRN WIRE BLK/GRN WIRE BLU/YEL WIRE BPP SENS LO REF BPP SENS SIG BRAKE PEDAL POSITION SENSOR (BEHIND BRAKE PEDAL ASSEMBLY) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU WIRE DK BLU/YEL WIRE ENGINE CONTROL MODULE EXCEPT BASE EQUIPMENT GMLAN DATA BUS (+) 1 GRY WIRE GRY/RED WIRE INSTRUMENT PANEL JUNCTION BLOCK PARK/NEUTRAL SIG TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH WHT WIRE WHT/GRN WIRE WHT/GRY WIRE

BATTERY FUSE BLOCK BLK WIRE BLU WIRE BLU/WHT WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM DK BLU WIRE FUSE 2 GROUND DISTRIBUTION SYSTEM GRY/BRN WIRE HI SPD GMLAN SER DATA (+) 1 HOT AT ALL TIMES INSTRUMENT PANEL JUNCTION BLOCK LEFT TRAILER TURN SIG LAMP LT GRN/VIO WIRE RED/GRN WIRE RED/LT GRN WIRE RIGHT TRAILER TURN SIG LAMP TRAILER BRAKE APPLY SIG TRAILER BRAKE POWER CONTROL MODULE TRAILER BRAKE PROVISION (BLUNT CUT) TRAILER CONNECTOR TRLR BRK FUSE UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLU WIRE WHT/LT GRN WIRE YEL/GRY WIRE

2 HI IND CTRL 4 HI IND CTRL 4 LO IND CTRL ACCY WAKEUP SERIAL DATA ACCY/ RUN CRNK FUSE AWD IND CTRL BATT + BLK WIRE BLU/GRY WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVE SW SIG DRIVER INFORMATION CENTER ASSEMBLY FRONT AXLE ACT CTRL FRONT AXLE ENGAGEMENT ACTUATOR FT AXLE ACTUATOR CTRL GEAR POSITION SENSOR GMLAN SERIAL DATA - 1 GRN/BLK WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE GRY/VIO WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN 1 VOLT INCREMENTAL ENCDR SENS RTN INCREMENTAL ENCDR SENS SPLY INCRMT ENCODER DIR SIG INSTRUMENT CLUSTER INSTRUMENT PANEL JUNCTION BLOCK LEFT INSTRUMENT PANEL FUSE BLOCK LOGIC MTR CLOCKWISE CTRL MTR COUNTER CLOCKWISE CTRL NEUTRAL IND CTRL POWER DISTRIBUTION SYSTEM RED/GRY WIRE ROTARY POS IMPULSE SIG ROTARY POS SENS RTN ROTARY POS SENS SIG RUN/CRANK IGN 1 VOLT SERIAL DATA (-) (1) TRANS IGN FUSE TRANSFER CASE CONTROL MODULE TRANSFER CASE LOCK SOL CTRL UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/GRN WIRE VIO/WHT WIRE VIO/YEL WIRE WHEEL LOCK IND WHT WIRE WHT/GRN WIRE WHT/LT GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/GRY WIRE YEL/VIO WIRE YEL/WHT WIRE

BATT POS VOLT BATT POSITIVE VOLT BK USB BK USB USB BLK WIRE BLK/WHT WIRE BLU/VIO WIRE BRN/GRY WIRE COMPUTER DATA LINES SYSTEM DIMMING CTRL DISPLAY SIG + ENABLE SIG ENTERTAINMENT REMOTE ENTERTAINMENT REMOTE ENABLE SIG GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/GRN WIRE GRY/VIO WIRE HEADPHONE COMMON SIG HOT AT ALL TIMES HUMAN MACHINE INTERFACE CONTROL MODULE HUMAN MACHINE INTERFACE CONTROL MODULE BYPASS MODULE INADVERTENT PWR CTRL INFO DISPLAY MODULE INFOTAINMENT INSTRUMENT PANEL JUNCTION BLOCK INTERIOR LAMP CTRL LED AMBIENT LIGHTING CTRL 2 LOGIC AUDIO/VIDEO INPUT ADAPTER LOW SPEED GMLAN SERIAL DATA LR SEAT AUDIO HEADPHONE SIG LVDS LVDS GY INFOTAINMENT DISPLAY SIG LVDS LVDS MEDIA DISC PLAYER MOST CONTROL MOST SERIAL DATA (+) NCA WIRE RDO FUSE REAR AUDIO LOW REF RED/GRN WIRE RED/VIO WIRE RIGHT INSTRUMENT PANEL FUSE BLOCK RR SEAT AUDIO HEADPHONE SIG RSE FUSE USB VIO/GRN WIRE W/ REAR SEAT ENTERTAINMENT W/ REAR SEAT ENTERTAINMENT W/O REAR SEAT ENTERTAINMENT WH INFOTAINMENT DISPLAY SIG WH LVDS WHT/BRN WIRE WHT/LT GRN WIRE WHT/VIO WIRE Y-BK USB YEL WIRE