Buick LaCrosse III (2016-2019) red/wht 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

AIR RECIRCULATION DOOR ACTUATOR BLK/YEL WIRE BLU/BRN WIRE BLU/YEL WIRE COMPUTER DATA LINES SYSTEM DRIVER INFORMATION CENTER DISPLAY ENGINE COOLANT TEMPERATURE GAUGE ENGINE COOLANT TEMPERATURE IND GRN WIRE GRY/GRN WIRE GRY/RED WIRE GRY/VIO WIRE INSTRUMENT CLUSTER LEFT AIR TEMPERATURE DOOR ACTUATOR LOGIC MODE DOOR ACTUATOR MOST SERIAL DATA (+) RED/WHT WIRE VIO/GRN WIRE WHT WIRE WHT/GRN WIRE WHT/GRY WIRE YEL/BLK WIRE YEL/BRN WIRE

A/C EVAPORATOR TEMPERATURE SENSOR AIR IONIZER AIR IONIZER ELECTRODE BLK WIRE BLK/YEL WIRE BLU/BRN WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DUCT LEFT LOWER AIR TEMPERATURE SENSOR DUCT LEFT UPPER AIR TEMPERATURE SENSOR DUCT RIGHT LOWER AIR TEMPERATURE SENSOR DUCT RIGHT UPPER AIR TEMPERATURE SENSOR GRID - GRN WIRE GRN/BLU WIRE GRY WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE HVAC CONTROL MODULE (BEHIND HVAC CONTROLS) RED/WHT WIRE RIGHT AIR TEMPERATURE DOOR ACTUATOR SERIAL DATA VIO/GRN WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/GRY WIRE WHT/YEL WIRE YEL/BLK WIRE YEL/BRN 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

ACC IGN VOLT ACC IND ADAPTIVE CRUISE CTRL GAP UP/DOWN SW SIG AMBIENT LIGHT SENS SIG ANTI-LOCK BRAKES SYSTEM ANTI-LOCK BRAKES, CRUISE CONTROL, EXTERIOR LIGHTS SYSTEMS ANTI-THEFT SYSTEM BATTERY POSITIVE VOLT BLK WIRE BLK/BRN WIRE BLK/GRY WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/GRN WIRE BRAKE APPLY SENS CTRL BRAKE APPLY SENS LOW REF BRAKE APPLY SENS SIG BRN WIRE BRN/BLK WIRE CHARGE IND CTRL COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DIMMER SW LO REF DIMMER SW SIG DIMMIMG IND DK BLU WIRE DK BLU/GRY WIRE DK BLU/RED WIRE DK BLU/YEL WIRE DK GRN WIRE DK GRN/BLK WIRE DK GRN/GRY WIRE DK GRN/VIO WIRE DK GRN/WHT WIRE DOOR LOCKS, ANTI-THEFT SYSTEMS ENGINE START/ STOP EXTERIOR LIGHTS, INTERIOR LIGHTS SYSTEMS FRT FOG LP SW SIG CTRL FUSE 18 FUSE 20 FUSE 21 FUSE 22 FUSE 29 FUSE 5 FUSE 8 GRN WIRE GROUND GRY WIRE GRY/VIO WIRE GRY/WHT WIRE HAZARD LED DIMMING SIGNAL HAZARD SW LEFT TURN SIG HAZARD SW RIGHT TURN SIG HAZARD SW SIG HDLP DIMMER SW HI BEAM SIG HDLP SW FLASH TO PASS SIG HORN SW SIG HDLP SW HDLP OFF SIG CTRL HDLP SW ON SIG HDLP SW PARK LAMPS SIG HEADLIGHTS SYSTEM HI SPD GMLAN SERIAL DATA (+) 1 REMOTE FUNCTION ACTR CTRL HI SPD GMLAN SERIAL DATA (+) 1 REMOTE FUNCTION ACTUATOR RECEIVE SIG HI SPD GMLAN SERIAL DATA (-) (1) HORNS SYSTEM HOT AT ALL TIMES IGN MODE SW ACC LED SIG IGN MODE SW START LED SIG IGNITION MODE SW MODE VOLT IGNITION MODE SWITCH INDICATOR DIMMING CTRL INSTRUMENT PANEL FUSE BLOCK KEYLESS ENTRY CONTROL MODULE LED BACKLIGHT DIMMING CTRL LIN BUS 15 LINEAR INTERCONNECT NETWORK SERIAL DATA BUS 4 LOW SPD GMLAN SERIAL DATA LT GRN WIRE PASSIVE START SW 2 LOW REF PASSIVE START SW SIG 2 POWER DISTRIBUTION SYSTEM RAP RLY COIL CTRL RED WIRE RED/BLU WIRE RED/BRN WIRE RED/DK GRN WIRE RED/GRY WIRE RED/WHT WIRE RED/YEL WIRE REMOTE FUNCTION ACTR TRANSMIT SIGNAL RUN/CRANK IGN 1 VOLT SECURITY INDICATOR CTRL SET/COAST/RESUME/ ACCELERATE SW SIG WINDSHIELD WIPER SW LOW REF START IND TRACTION CTRL SW SIG 1 TRANSMISSIONS SYSTEM UP/TAP DOWN SW SIG VIO WIRE VIO/BLK WIRE VIO/YEL WIRE WHT WIRE WINDSHIELD WASHER SW SIG WINDSHIELD WIPER SW HI SIG WINDSHIELD WIPER SW LOW SIG WIPER/WASHER SYSTEM YEL WIRE YEL/GRY WIRE

ACCESSORY WAKEUP SERIAL DATA BACKUP LAMP CTRL BATTERY BATTERY CURRENT SENSOR BATTERY FUSE BLOCK BATTERY POSITIVE VOLTAGE BLK WIRE BLK/VIO WIRE BLU/BRN WIRE BLU/GRY WIRE BLU/WHT WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) BRN WIRE BRN/DK GRN WIRE BRN/GRN WIRE BRN/GRY WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COURTESY LAMP SW SIG CRUISE CONTROL SYSTEM CURRENT SENS CTRL CURRENT SENS LOW REF CURRENT SENS SIG DK BLU WIRE DK BLU/VIO WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/BRN WIRE DK GRN/VIO WIRE DK GRN/YEL WIRE DOME LAMP OFF INDICATOR CTRL DOOR LOCKS, ANTI-THEFT SYSTEMS DR LCK ACTUATOR UNLOCK CTRL DR LOCK ACTUATOR LOCK CTRL DR LOCK ACTUATOR LOCK CTRL 2 DRV DR LOCK SW LOCK SIG DRV DR LOCK SW UNLOCK SIG DRV OUTSIDE REAR VIEW MIRR PUDDLE LAMP CTRL FOG LAMP RLY CTRL LIFT GLASS/REAR COMPT LID FUSE 4 GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND GRY WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/VIO WIRE GRY/YEL WIRE HDLP HIGH BEAM RLY CTRL HEADLAMP LOW BEAM RLY CTRL HEADLIGHTS SYSTEM HI SPD GMLAN SERIAL DATA (-) (1) HI SPEED GMLAN DATA BUS (-) HOOD STATUS B SIG HORN RLY CTRL HORNS SYSTEM HOT AT ALL TIMES INADVERTENT POWER CTRL INTERIOR LAMP CTRL INTERIOR LAMP DEFEAT SW SIG PPL LOGISTIC MODE RLY OPEN CTRL LED AMBIENT LIGHTING CTRL 1 LED BACKLIGHT DIMMING CTR LEFT CORNERING LAMP RLY CTRL LEFT PARK LAMP CTRL LEFT REAR DR LOCK MTR STATUS LEFT REAR STOP LAMP CTRL LF TURN SIG LAMP CTRL LIFT GLASS/REAR COMPT LID INTERIOR RELEASE SIG LIFTGATE AJAR SWITCH SIG 1 LINEAR INTERCONNECT NETWORK BUS 2 LINEAR INTERCONNECT NETWORK BUS 3 LOGISTIC MODE RLY CLOSE CTRL LR STOP/TURN SIG LAMP CTRL MTR RELEASE CTRL CRUISE/ETC/TCC BRAKE SIGNAL PASS DR LOCK SW LOCK CTRL PASS DR LOCK SW UNLOCK CTRL POWER DISTRIBUTION SYSTEM PUSH BUTTON START CHALLENGE ACTIVE REAR COMPT LID LAMP CTRL REAR LICENSE LAMP CTRL RED/GRY WIRE RED/WHT WIRE REMOTE PRNDL ENABLE RIGHT CORNERING LAMP RLY CTRL RIGHT FRT DRL CTRL RIGHT FRT TURN SIG LAMP CTRL RIGHT PARK LAMP CTRL RIGHT REAR DR LOCK MTR STATUS RIGHT REAR STOP LAMP CTRL RIGHT REAR STOP/TURN LAMP CTRL RR CLOSURE HANDLE SW OPEN SIG LINEAR INTERCONNECT NETWORK DATA BUS 1 RUN/CRANK RELAY COIL CTRL SERIAL DATA COMM ENABLE STARTING/CHARGING SYSTEM STOP LAMP RELAY COIL CTRL TRANSMISSIONS SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM DOOR LOCKS, ANTI-THEFT SYSTEMS VIO WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/YEL WIRE WINDSHIELD WASHER RELAY CTRL WINDSHIELD WIPER MTR RLY COIL WIPER/WASHER SYSTEM YEL WIRE YEL/BLU WIRE YEL/DK BLU WIRE

73 8 SIG GND ADAPTIVE CRUISE IND APP LO REF (1) APP LOW REF 2 APP SIG (1) APP SIG (2) BATT POSITIVE VOLT BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/RED WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) BRAKE APPLY SENS CTRL BRAKE APPLY SENS LOW REF BRAKE APPLY SENS SIG BRAKE PEDAL POSITION SENSOR (TOP OF BRAKE PEDAL ASSEMBLY) BRAKE POS SENS LOW REF BRAKE POS SENS SIG BRN WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM CRUISE IND CRUISE/ETC/TCC BRK SIG DATA 2 (+) DK BLU WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE DK GRN/WHT WIRE DRIVER INFORMATION CENTER DISPLAY ECM IGN FUSE ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) FUSE 20 FUSE 5 GMLAN GRY WIRE GRY/LT GRN WIRE HIGH SPD GMLAN SERIAL DATA (+) 1 HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK LOGIC LOW SPD LT GRN/WHT WIRE MAIN RELAY FUSED SUPPLY 2 RED WIRE RED/BRN WIRE RED/WHT WIRE RED/YEL WIRE RUN/CRANK IGN 1 VOLT SERIAL SERIAL DATA (-) (1) SET/COAST/RESUME/ ACCELERATE SW THROTTLE ACTUATOR CTRL CLOSE THROTTLE ACTUATOR CTRL OPEN THROTTLE POS SENS LOW REF THROTTLE POS SENS SIG UNDERHOOD FUSE BLOCK UP/DOWN SW SIG VIO/LT GRN WIRE WHT WIRE WHT/BLU WIRE WHT/LT GRN WIRE WHT/RED WIRE YEL WIRE YEL/WHT WIRE

ADAPTIVE CRUISE SWITCH AUTOMATIC TRANSMISSION ASSEMBLY BLK/BRN WIRE BLK/DK BLU WIRE BLK/RED WIRE BLK/VIO WIRE BLK/YEL WIRE BLU WIRE BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM CRUISE SWITCH DK BLU WIRE DK BLU/WHT WIRE FORWARD COLLISION ALERT WARNING SWITCH GAP SWITCH GRY WIRE GRY/GRN WIRE HIGH SPD GMLAN SERIAL DATA (+) 1 LEFT STEERING WHEEL CONTROLS SWITCH LOGIC LT GRN/WHT WIRE NCA WIRE ON/OFF SWITCH OSS HIGH SIGNAL OSS LOW SIGNAL RED WIRE RED/WHT WIRE RES+ SET- STEERING WHEEL AIR BAG COIL TRANSMISSION CONTROL MODULE TRANSMISSION OUTPUT SHAFT SPEED SENSOR W/ ADAPTIVE CRUISE CONTROL W/O ADAPTIVE CRUISE CONTROL WHT WIRE WHT/RED WIRE YEL 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

ACC IGN VOLT ACTIVE SIG ANT 1 SIG HI ANT 1 SIG LO ANT 2 SIG HI ANT 2 SIG LO ANT 3 SIG HI ANT 3 SIG LO ANT SIG HI ANT SIG LO BATT POSITIVE VOLT BLK WIRE BLK/GRY WIRE BLU WIRE BRN/BLK WIRE BRN/GRN WIRE BRN/YEL WIRE CENTER CONSOLE FRONT KEYLESS ENTRY ANTENNA CENTER CONSOLE REAR KEYLESS ENTRY ANTENNA COMPUTER DATA LINES SYSTEM DK GRN/BLK WIRE DRV DR ANT SIG HI DRV DR ANT SIG LO DRV DR HANDLE SW SIG DRV DR OPEN SW SIG GRN WIRE GRN/BLK WIRE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES IGNITION MODE SWITCH KEYLESS ENTRY CONTROL MODULE LO SPD GMLAN SERIAL DATA LR DR HANDLE SW SIG LT GRN WIRE PASS DR ANT SIG HI PASS DR ANT SIG LO PASSIVE START SW 2 LO REF PASSIVE START SW SIG 2 PEPS FUSE POWER DISTRIBUTION SYSTEM PPL PPL PASS DR HANDLE SW SIG RAP RLY 2 COIL CTRL REAR COMPARTMENT KEYLESS ENTRY ANTENNA RED/WHT WIRE RR DR HANDLE SW SIG RUN/CRANK IGN 1 VOLT UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/GRY WIRE VIO/YEL WIRE WHT WIRE WHT/GRN WIRE WHT/YEL WIRE YEL WIRE YEL/GRY WIRE