Buick LaCrosse III (2016-2019) underhood fuse block Wiring diagrams

A/C COMPRESSOR A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C COMPRESSOR SOLENOID VALVE A/C HEV FUSE A/C ON IND A/C ON SWITCH AIR QUALITY SENSOR (BELOW AIR INLET GRILL PANEL) AUTO IND UPPER AIR OUTLET IND AUTO SWITCH BLK WIRE BRN/LT GRN WIRE COMPUTER DATA LINES SYSTEM DATA BUS 9 DK BLU/BRN WIRE DK BLU/YEL WIRE DK GRN/YEL WIRE DRIVER HEATED SEAT SWITCH DRIVER TEMPERATURE DISPLAY HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED HVAC CONTROLS IGN VOLT AIR QUALITY SENS SIG IP BODY IGN FUSE LEFT HIGH SEAT HEAT IND LEFT LOW SEAT HEAT IND LEFT MED SEAT HEAT IND LOGIC LOWER AIR OUTLET IND LOWER AIR OUTLET SWITCH LT GRN WIRE MAX IND MAX SWITCH PASSENGER HEATED SEAT SWITCH PASSENGER TEMPERATURE DISPLAY REAR DEFOGGER IND REAR DEFOGGER SWITCH RECIRCULATION IND RECIRCULATION SWITCH RED WIRE RED/LT BLU WIRE RED/WHT WIRE RIGHT HIGH SEAT HEAT IND RIGHT LOW SEAT HEAT IND RIGHT MED SEAT HEAT IND SERIAL DATA START STOP IND START/ STOP SWITCH SYNC SWITCH UNDERHOOD FUSE BLOCK UPPER AIR OUTLET SWITCH VIO/GRY WIRE VIO/WHT WIRE WHT/GRY WIRE WINDSHIELD DEFROST IND SYNC IND WINDSHIELD DEFROST SWITCH

A/C PRESS SENS A/C REFRIGERANT PRESS SENS SIG A/C REFRIGERANT PRESSURE SENSOR AIR TEMP SENS SIG AMBIENT AIR TEMPERATURE SENSOR BATT POS VOLT BATT POS VOLT COOLING FAN CTRL RELAY SPEED SIG BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/WHT WIRE BLU WIRE BLU/GRY WIRE BRN/RED WIRE CLUTCH RELAY CTRL COMPUTER DATA LINES SYSTEM COOL FAN FUSE DK BLU WIRE DK GRN WIRE EBOOST/COOL FAN LT FUSE ENG COOLANT TEMP SENS SIG ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) ENGINE COOLANT TEMPERATURE SENSOR FUSE 9 GROUND HI SPEED GMLAN SERIAL DATA (-) 1 HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK LEFT COOLING FAN MOTOR (BEHIND LEFT SIDE OF RADIATOR) LOGIC NCA WIRE RED/BRN WIRE RED/YEL WIRE RELAY SPEED SIG RIGHT COOLING FAN MOTOR (BEHIND RIGHT SIDE OF RADIATOR) SENS LOW REF SIG GROUND UNDERHOOD FUSE BLOCK WHT WIRE WHT/BLK WIRE WHT/GRY WIRE

ACCESSORY WAKEUP SER DATA BACKUP LAMP CTRL BATT POS VOLT BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE COMPUTER DATA LINES SYSTEM DK BLU WIRE ENGINE CONTROL MODULE FUSE 22 GRN WIRE GRN/WHT WIRE GROUND DISTRIBUTION SYSTEM HI SPD GMLAN SER DATA (+) 1 HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT PANEL FUSE BLOCK LEFT BACKUP LAMP LEFT TAIL LAMP ASSEMBLY LOGIC INSIDE REAR VIEW MIRROR LOGIC TRANSMISSION CONTROL MODULE PARK/NEUTRAL SIG (1) RED/WHT WIRE RIGHT BACKUP LAMP RIGHT TAIL LAMP ASSEMBLY RUN/CRANK IGNITION 1 VOLT SER DATA (-) (1) SIG GROUND TCM/ IGN FUSE UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/YEL WIRE WHT WIRE WHT/GRY WIRE

BATT POS BATT POS VOLT BLK WIRE BODY CONTROL MODULE BRN WIRE CENTER CONSOLE COMPARTMENT LAMP COMPUTER DATA LINES SYSTEM COURTESY LP SW SIG INADVERTENT PWR CTRL DEFEAT SW SIG INTERIOR LAMP CTRL DC DC BATT 2/AWD FUSE DK BLU WIRE DRIVER DOOR ACCENT LAMP DRIVER DOOR HANDLE FLOOD LAMP DRIVER DOOR PULL HANDLE FLOOD LAMP FUSE 10 FUSE 18 FUSE 5 GRN/GRY WIRE GRY WIRE GRY/BRN WIRE HOT AT ALL TIMES INSTRUMENT PANEL COMPARTMENT LAMP INSTRUMENT PANEL FUSE BLOCK LED AMBIENT LIGHTING CTRL 1 LID LAMP CTRL NCA WIRE PASSENGER DOOR ACCENT LAMP PASSENGER DOOR HANDLE FLOOD LAMP PASSENGER DOOR PULL HANDLE FLOOD LAMP POWER DISTRIBUTION SYSTEM POWER SUPPLY TRANSFORMER REAR COMPARTMENT COURTESY LAMP RED/DK BLU WIRE RED/DK GRN WIRE RED/GRY WIRE RED/YEL WIRE REGULATED SERIAL DATA (-) (1) SPLY VOLT 2 UNDERHOOD FUSE BLOCK VOLT W/ STOP/ START SYSTEM W/ STOP/START SYSTEM W/O STOP/ START SYSTEM WHT WIRE WHT/BRN WIRE WHT/YEL WIRE

BATTERY POSITIVE VOLT BLK WIRE BLK/GRN WIRE BLK/GRY WIRE BLU/GRY WIRE BRN/GRN WIRE BRN/LT BLU WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/YEL WIRE DRIVER INFORMATION CENTER DISPLAY FT AXLE LEVEL SENS SIG FT LEVEL SENS LOW REF GMLAN SER DATA (-) (2) GMLAN SER DATA - (1) GRN/GRY WIRE GRY/LT BLU WIRE GRY/LT GRN WIRE GRY/VIO WIRE GRY/WHT WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT FRONT SHOCK ABSORBER ACTUATOR LEFT FRONT SUSPENSION POSITION SENSOR LEFT REAR SHOCK ABSORBER ACTUATOR LF DAMPING SERVO CTRL LOGIC LOW SPEED GMLAN SERIAL DATA 2 LR DAMPING SERVO CTRL NCA WIRE RED/GRN WIRE RF ACCEL LOW REF RF DAMPING SERVO CTRL RF WHEEL ACCEL SIG RIGHT FRONT SHOCK ABSORBER ACTUATOR RIGHT FRONT SUSPENSION POSITION SENSOR RIGHT REAR SHOCK ABSORBER ACTUATOR RR DAMPING SERVO CTRL RR HTD SEAT/ BSM/ESS FAN FUSE SERIAL DATA COMM ENABLE SUSPENSION CONTROL MODULE UNDERHOOD FUSE BLOCK WHT WIRE WHT/DK BLU WIRE WHT/RED WIRE

BACKUP LAMPS CIRCUIT BLK WIRE BLK/BRN WIRE BLU/BRN WIRE BLU/GRN WIRE BRN/DK GRN WIRE COMPUTER DATA LINES SYSTEM CRN LT FUSE CRN RT FUSE DK BLU/WHT WIRE DK BLU/YEL WIRE DRIVER OUTSIDE REAR VIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REAR- VIEW MIRROR GMLAN GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/LT GRN WIRE GRY/VIO WIRE GRY/YEL WIRE HAZARD SWITCH HAZARD WARNING SWITCH HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED INSTRUMENT CLUSTER LEFT AUXILIARY TAIL LAMP LEFT BACKUP LAMP LEFT CORNERING LAMP RELAY LEFT REAR COMPARTMENT LID TAIL LAMP ASSEMBLY LEFT REAR SIDE MARKER LAMP LEFT REAR TURN SIGNAL LAMP LEFT TAIL LAMP LEFT TAIL LAMP ASSEMBLY LEFT TAIL/STOP LAMP LEFT TURN IND LEFT TURN SIGNAL REPEATER LAMP LO SPD LOGIC LT GRN WIRE PARK LAMPS IND RED WIRE RED/BRN WIRE RIGHT CORNERING LAMP RELAY RIGHT TURN IND SER DATA (+) 2 UNDERHOOD FUSE BLOCK VIO WIRE VIO/GRY WIRE VIO/WHT WIRE WHT WIRE WHT/YEL WIRE YEL WIRE YEL/DK BLU WIRE YEL/GRY WIRE YEL/WHT WIRE

B+ VOLT BLK WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU/VIO WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DOOR LOCK MTR STATUS SIG DOOR LOCK KEY SW UNLOCK SIG DOOR LOCKS SYSTEM DOWN DRIVER WINDOW MOTOR DRIVER WINDOW/OUTSIDE REAR VIEW MIRROR SWITCH EXPRESS FUSE 1 FUSE 2 GRY WIRE HOT AT ALL TIMES ILL INSTRUMENT PANEL FUSE BLOCK LEFT FRONT WINDOW DOWN SWITCH LEFT FRONT WINDOW EXPRESS SWITCH LEFT FRONT WINDOW UP SWITCH LEFT REAR WINDOW DOWN SWITCH LEFT REAR WINDOW EXPRESS SWITCH LEFT REAR WINDOW UP SWITCH LF DR AJAR SW SIG LOCKOUT IND LOCKOUT SWITCH LOGIC N/W BUS 3 PASSENGER WINDOW MOTOR PASSENGER WINDOW SWITCH RED/DK BLU WIRE RED/WHT WIRE RF DR AJAR SW SIG RIGHT FRONT WINDOW DOWN SWITCH RIGHT FRONT WINDOW EXPRESS SWITCH RIGHT FRONT WINDOW UP SWITCH RIGHT REAR WINDOW DOWN SWITCH RIGHT REAR WINDOW EXPRESS SWITCH RIGHT REAR WINDOW UP SWITCH SW DOWN SIG SW DRV DOWN SIG SW DRV EXP SIG SW DRV UP SIG SW EXPRESS SIG SW UP SIG UNDERHOOD FUSE BLOCK VIO/GRY WIRE W/O MEMORY W/ MEMORY WHT/VIO WIRE WNDW MIR SEAT FUSE YEL/BLK WIRE

BLK WIRE DK GRN WIRE DK GRN/WHT WIRE FRONT OVERHEAD CONSOLE ASSEMBLY GRY WIRE HOT W/ IGNITION MAIN RELAY ENERGIZED NCA WIRE REAR AUDIO CONTROL MODULE REAR WINDOW SUNSHADE MODULE REAR WINDOW SUNSHADE MOTOR RED WIRE RVC/ VENT FUSE SUNSHADE SWITCH UNDERHOOD FUSE BLOCK VIO WIRE VIO/GRY WIRE VIO/WHT WIRE YEL WIRE

AUTOMATIC TRANSMISSION ASSEMBLY BATTERY BATTERY CURRENT SENSOR BATTERY FUSE BLOCK BLK WIRE BLK/GRY WIRE BLK/WHT WIRE BLU/GRN WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) CHARGING CIRCUIT COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN/BLK WIRE DRIVER INFORMATION CENTER DISPLAY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) FUSE 1 FUSE 2 GMLAN SERIAL DATA GMLAN SERIAL DATA - 1 GRY WIRE GRY/LT GRN WIRE HIGH SPEED GMLAN SERIAL DATA (-) (1) HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED IGN COIL FUSE IGNITION MODE SWITCH INSTRUMENT CLUSTER KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LO SPD GMLAN SERIAL DATA LOGIC LOW REF LOW SPEED LT GRN WIRE MAIN RLY FUSED SPLY 2 MODE VOLTAGE PARK/NEUTRAL SIG (1) PASSIVE START SW SIG 2 RED WIRE RED/YEL WIRE SIG GND STARTER ENABLE RELAY CTRL STARTER MOTOR STARTER RELAY STRTR MTR FUSE TRANSMISSION CONTROL MODULE TRANSMISSION PARK/ NEUTRAL SIG 1 UNDERHOOD FUSE BLOCK VIO WIRE VIO/DK BLU WIRE WHT WIRE WHT/GRY WIRE YEL WIRE YEL/BLK WIRE

BATT POS VOLT BLK WIRE BODY CONTROL MODULE (UNDER FRONT CONSOLE) BRN/GRY WIRE COMPUTER DATA LINES SYSTEM DC DC BATT 2/AWD FUSE DELAY SWITCH DK BLU WIRE DK GRN/BRN WIRE DRIVER INFORMATION CENTER DISPLAY FRT WPR FUSE FUSE 20 FUSE 41 GRY WIRE GRY/LT GRN WIRE GRY/VIO WIRE HI SPD GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK LIN SERIAL DATA BUS 1 LOGIC LOW SPD GMLAN SERIAL DATA 2 OFF MIST POWER SUPPLY TRANSFORMER RED/BRN WIRE RED/DK BLU WIRE RED/YEL WIRE SPLY VOLT 1 UNDERHOOD FUSE BLOCK W/O START/STOP SYSTEM W/ START/STOP SYSTEM WASH PUMP FUSE WASHER SWITCH WHT WIRE WINDSHIELD WASHER PUMP WINDSHIELD WASHER PUMP RELAY WINDSHIELD WASHER RLY CTRL WINDSHIELD WASHER SW SIG WINDSHIELD WIPER MOTOR WINDSHIELD WIPER MTR RLY COIL CTRL WINDSHIELD WIPER SW HI SIG WINDSHIELD WIPER SW LO REF WINDSHIELD WIPER SW LOW SIG WINDSHIELD WIPER/WASHER SWITCH WIPER SWITCH YEL WIRE