Buick LaCrosse III (2016-2019) ground distribution system Wiring diagrams

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

AUTO OFF BATT POS VOLT BLK WIRE BLK/BRN WIRE BLU/BRN WIRE BLU/WHT WIRE BODY CONTROL MODULE BRK APPLY SENS CTRL BRK APPLY SENS SIG BRL APPLY SENS LO REF BRN/DK GRN WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE DRV OUTSIDE REAR VIEW MIRROR PUDDLE LP CTRL FUSE 18 FUSE 21 FUSE 22 FUSE 8 GRN/VIO WIRE GRN/YEL WIRE GROUND GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/VIO WIRE GRY/YEL WIRE HAZ LED DIMMING SIG HI SPD GMLAN SER DATA (-) 1 HAZ SW LEFT TURN SIG HAZ SW RIGHT TURN SIG HAZ SW SIG HEAD PARK HEADLAMP SW PARK LP SIG HEADLAMP SWITCH HI SPD GMLAN SER DATA (+) 1 HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK LEFT CORNERING LAMP LEFT FRONT SIDE MARKER LAMP LEFT FRONT TURN SIGNAL LAMP LEFT HEADLAMP ASSEMBLY LEFT PARK DAYTIME RUNNING LAMP LF TURN SIG LP CTRL LH CORNERING LP RLY CTRL LH PARK LP CTRL LR STOP LP CTRL LR STOP/TURN LP CTRL LT GRN WIRE NCA WIRE REAR LICENSE LP CTRL RED/BRN WIRE RED/DK BLU WIRE RED/DK GRN WIRE RED/GRY WIRE RED/WHT WIRE RF TURN SIG LP CTRL RH CORNERING LP RLY CTRL RH PARK LP CTRL RR STOP LP CTRL RR STOP/TURN LP CTRL STOP LP RLY COIL CTRL TURN SIGNAL/ MULTI-FUNCTION SWITCH VIO WIRE VIO/GRY WIRE VIO/WHT WIRE W/ HID W/O HID WHT WIRE WHT/YEL WIRE YEL/DK BLU WIRE YEL/GRY WIRE

5 VOLT REF BLK WIRE BLK/BRN WIRE BLK/YEL WIRE BLU/WHT WIRE BRAKE PEDAL POSITION SENSOR BRK POS SENS BRK POS SENS SIG BRN/DK GRN WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/YEL WIRE ENGINE CONTROL MODULE FUSE 20 GRN/VIO WIRE GRN/YEL WIRE GROUND DISTRIBUTION SYSTEM GRY/BRN WIRE GRY/GRN WIRE HI SPEED GMLAN HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK LO REF NCA WIRE RED/BRN WIRE RIGHT AUXILIARY TAIL LAMP RIGHT CORNERING LAMP RIGHT FRONT SIDE MARKER LAMP RIGHT FRONT TURN SIGNAL LAMP RIGHT HEADLAMP ASSEMBLY RIGHT PARK DAYTIME RUNNING LAMP RIGHT REAR COMPARTMENT LID TAIL LAMP ASSEMBLY SERIAL DATA (-) (1) VIO/GRN WIRE VIO/WHT WIRE W/ HID W/O HID WHT WIRE WHT/GRN WIRE WHT/LT GRN WIRE WHT/RED WIRE WHT/YEL WIRE YEL/WHT WIRE

AIR CONDITIONING SYSTEM AMBIENT LIGHT SENS SIG AMBIENT LIGHT/ SUNLOAD SENSOR BATT POS VOLT BLK WIRE BLK/LT GRN WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/GRY WIRE FOG LAMP FUSE FOG LAMP RLY CTRL FRONT FOG LAMP RELAY FRONT FOG LAMP SW SIG FTP FUSE 18 GRN WIRE GROUND GROUND DISTRIBUTION SYSTEM GRY WIRE HDLP DIMMER SW HI BEAM SIG HDLP HI BEAM RLY CTRL HDLP LO BEAM RLY CTRL HDLP OFF SIG CTRL HDLP SW FLASH TO PASS SIG HDLP SW ON SIG HDLP SW PARK LAMP SIG HEADLAMP HIGH BEAM RELAY HEADLAMP LOW BEAM RELAY HI BEAM LT/RT FUSE HI SPD GMLAN SER DATA - HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL FUSE BLOCK LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP BALLAST LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LO BEAM HID LT FUSE LO BEAM HID RT FUSE LOW REF LT GRN WIRE NCA WIRE RED/GRY WIRE RED/YEL WIRE TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK W/ ONSTAR W/O ONSTAR WHT WIRE YEL WIRE YEL/GRN WIRE

AUTO BATTERY FUSE BLOCK BLK WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DK BLU/GRY WIRE DRIVER INFORMATION CENTER DISPLAY FOG LAMP SWITCH FRONT FOG LAMP IND FUSE 2 GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/LT GRN WIRE HEAD PARK HEADLAMP SWITCH HIGH BEAM LAMP IND HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT FRONT FOG LAMP LOGIC LOW SPD GMLAN SER DATA NCA WIRE OFF OFF HEAD PARK RED/YEL WIRE RIGHT FRONT FOG LAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP BALLAST RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT LOW BEAM HEADLAMP WHT WIRE YEL WIRE

BATT POS VOLT BLK WIRE BLU/GRY WIRE BODY CONTROL MODULE COMPUTER DATA LINES SYSTEM FUSE 18 GMLAN SER DATA (+) 8 GRN/VIO WIRE GROUND GROUND DISTRIBUTION SYSTEM HDLP LVL FUSE HEADLAMP CONTROL MODULE HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP HORIZONTAL MOTOR LIN SER DATA BUS 6 LOGIC RED/BRN WIRE RED/GRY WIRE RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP HORIZONTAL MOTOR SER DATA COMM ENABLE UNDERHOOD FUSE BLOCK WHT/DK BLU WIRE WHT/GRY WIRE

BLK WIRE BRN WIRE FUSE GROUND GROUND DISTRIBUTION SYSTEM GRY/GRN WIRE HEATED STEERING WHEEL IND HEATED STEERING WHEEL SWITCH HOT W/ IGNITION MAIN RELAY ENERGIZED HTD WHL FUSE IGN INSIDE STEERING WHEEL) LEFT STEERING WHEEL CONTROLS SWITCH LOGIC LT BLU WIRE ORG/ WIRE PNK SW LED CTRL WIRE PPL/BLU WIRE RED WIRE RED/BLK WIRE RIGHT STEERING WHEEL CONTROLS SWITCH STEERING WHEEL AIR BAG COIL STEERING WHEEL HEATER STEERING WHEEL HEATING CONTROL MODULE SW SIG UNDERHOOD FUSE BLOCK VIO/GRY WIRE VOLT REF WHT WIRE YEL WIRE

BLK WIRE COMPUTER DATA LINES SYSTEM CTRL DK GRN/BLK WIRE DK GRN/DK BLU WIRE DK GRN/GRY WIRE DK GRN/YEL WIRE DRIVER WINDOW/ LOGIC OUTSIDE REAR VIEW MIRROR SWITCH FRONT VIEW CAMERA GARAGE DOOR OPENER GROUND DISTRIBUTION SYSTEM HVAC CONTROLS IND INFO DISPLAY MODULE INSTRUMENT CLUSTER INSTRUMENT PANEL MULTI- FUNCTION SWITCH LANE DEPARTURE WARNING LIGHT IND LEFT REAR LOGIC WINDOW SWITCH LOCAL INTERCONNECT NETWORK BUS 10 LOCAL INTERCONNECT NETWORK BUS 12 LOCAL INTERCONNECT NETWORK BUS 26 LOCAL INTERCONNECT NETWORK BUS 9 LOGIC LT GRN WIRE PARKING ASSIST CONTROL MODULE PARKING ASSIST IND RIGHT REAR LOGIC WINDOW SWITCH TRANSMISSION SHIFT LEVER TRANSMISSION SHIFT LEVER KNOB TRANSMISSION SHIFT LEVER POSITION INDICATOR W/ PARK ASSIST, LANE KEEP ASSIST WHT WIRE WHT/VIO WIRE YEL WIRE