Buick LaCrosse III (2016-2019) blk/yel Wiring diagrams

ABS IND. ACCESSORY WAKEUP SERIAL DATA BATT POS VOLT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/BLK WIRE BLU/VIO WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) BRAKE BOOSTER VACUUM SENSOR BRAKE PEDAL POSITION SENSOR (TOP OF BRAKE PEDAL ASSEMBLY) BRAKE WARNING IND BRK APPLY SENS CTRL BRK APPLY SENS LOW REF BRK APPLY SENS SIG BRK POS SENS 5 VOLT REF BRK POS SENS LO REF BRK POS SENS SIG BRK VACUUM SENS SIG BRN WIRE COMPUTER DATA LINES SYSTEM CRUISE/ETC/TCC BRK SIG DK BLU WIRE DK BLU/YEL WIRE DRIVER INFORMATION CENTER DISPLAY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) ESC IND ESC OFF IND FUSE 20 FUSED SUPPLY 2 GRY/LT GRN WIRE GRY/RED WIRE HI SPD GMLAN SERIAL DATA (-) (1) HOT AT ALL TIMES INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK INSTRUMENT PANEL MULTI- FUNCTION SWITCH LOGIC PARK BRAKE CONTROL SWITCH (CENTER OF FLOOR CONSOLE) RED/BRN WIRE SIG GND TRACTION CONTROL OFF IND TRACTION CONTROL SWITCH TRACTION CTRL SW SIG 1 VIO/YEL WIRE WHT WIRE WHT/DK BLU WIRE WHT/LT GRN WIRE WHT/RED WIRE YEL WIRE YEL/RED WIRE YEL/VIO WIRE

ACCESSORY WAKEUP SERIAL DATA B+ VOLT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BODY CONTROL MODULE (UNDER FLOOR CONSOLE) BRAKE PEDAL POSITION SENSOR (TOP OF BRAKE PEDAL ASSEMBLY) BRK APPLY SENS CTRL BRK APPLY SENS SIG BRK POS SENS 5 VOLT REF BRK POS SENS LO REF BRK POS SENS SIG COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/YEL WIRE DK GRN/DK BLU WIRE DK GRN/VIO WIRE ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) FUSE 20 FUSE 5 FUSED SUPPLY 4 GROUND HI SPD GMLAN SERIAL DATA (-) (1) HI SPD GMLAN SERIAL DATA (-) 1 PARK/NEUTRAL SIG HIGH SPD SER DATA (+) (1) HIGH SPD SER DATA (+) 1 BRK APPLY SENS LOW REF HIGH SPD SER DATA (+) 2 HIGH SPD SER DATA (+) 2 BATT POS VOLT HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT PANEL FUSE BLOCK LEFT TRANSMISSION MANUAL SHIFT SWITCH LIN DATA BUS 26 LOGIC MIL SS FUSE PWR/TRN ON ENG FUSE RED/BRN WIRE RED/WHT WIRE RED/YEL WIRE REMOTE PRNDL ENABLE RIGHT TRANSMISSION MANUAL SHIFT SWITCH RUN/CRANK IGN 1 SIG GND STEERING WHEEL AIR BAG COIL SYSTEM TAP UP/TAP DOWN SW SIG TRANSMISSION RANGE CONTROL MODULE (TOP OF TRANSMISSION) TRCM FUSE UNDERHOOD FUSE BLOCK VIO/BLK WIRE VIO/DK BLU WIRE VIO/YEL WIRE WAKEUP SER DATA WHT WIRE WHT/GRY WIRE WHT/LT GRN WIRE WHT/RED 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

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

BACKUP LP CTRL BLK WIRE BLK/YEL WIRE DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR- VIEW MIRROR GRN WIRE GRN/WHT WIRE HOT W/ IGNITION MAIN RELAY ENERGIZED IP BODY IGN FUSE LOGIC INSIDE REAR VIEW MIRROR MIRROR DIMMING MIRROR LOW REF MIRROR SIG NCA WIRE RED WIRE RUN/CRANK IGN 1 VOLT UNDERHOOD FUSE BLOCK VIO/GRY WIRE WHT/BLK WIRE YEL/WHT WIRE

BATTERY POSITIVE VOLT BLK WIRE BLK/GRN WIRE BLK/GRY WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BRN/BLK WIRE BRN/BLU WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DRIVER BACK SEAT HEATING ELEMENT DRIVER CUSHION SEAT HEATING ELEMENT DRV HEATED BACK NTC SIG DRV HEATED SEAT ELEMENT SPLY CTRL DRV HEATED SEAT NTC LOW REF DRV HEATED SEAT NTC SIG DRV SEAT HEADREST MOTOR FORWARD CTRL DRV SEAT VENT MOTOR CTRL 1 FRONT SEAT HEATING CONTROL MODULE FRT HEATED SEAT FUSE GRN/BLU WIRE GRN/VIO WIRE GROUND GRY/BLK WIRE HOT AT ALL TIMES LOCAL INTERCONNECT NETWORK SERIAL DATA BUS 2 NCA WIRE PASS HEATED BACK NTC LOW REF PASS HEATED BACK NTC SIG PASS HEATED SEAT ELEMENT RETURN PASS HEATED SEAT ELEMENT VOLT PASS HEATED SEAT NTC LOW REF PASS HEATED SEAT NTC SIG PASS SEAT VENT MOTOR CTRL 1 PASSENGER BACK SEAT HEATING ELEMENT PASSENGER CUSHION SEAT HEATING ELEMENT POWER DISTRIBUTION SYSTEM RED/BLU WIRE RED/VIO WIRE UNDERHOOD FUSE BLOCK VIO/WHT WIRE WHT/BLU WIRE WHT/GRY WIRE YEL/GRY WIRE

BATT POSITIVE VOLT BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/YEL WIRE BLU WIRE BRN/BLK WIRE BRN/YEL WIRE COMMON CTRL COMPUTER DATA LINES SYSTEM DEFOGGER SYSTEM DK BLU/DK GRN WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE DOWN DRIVER OUTSIDE REAR VIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR VIEW MIRROR MOTOR DRIVER OUTSIDE REAR- VIEW MIRROR DRIVER SEAT MEMORY SWITCH DRIVER SIDE OBJECT DETECTION INDICATOR DRIVER WINDOW/OUTSIDE REAR VIEW MIRROR SWITCH EXIT GRY/BRN WIRE GRY/GRN WIRE HOT AT ALL TIMES ILL LEFT LEFT TURN SIGNAL REPEATER LAMP LH (-) RH (+) SIG LIN DATA BUS 8 LOGIC LOW REF MIRROR DIMMING MIRRORS SYSTEM NAVIGATION SYSTEM RED/BLU WIRE RED/DK BLU WIRE RH (+) LH (-) CTRL RIGHT RWD SET- UNDERHOOD FUSE BLOCK UP (+) DOWN (-) CTRL UP DOWN SIG VIO/DK BLU WIRE VIO/RED WIRE WHT WIRE WHT/YEL WIRE WNDW MIR SEAT FUSE YEL WIRE YEL/BRN WIRE YEL/WHT WIRE

BATT POSITIVE VOLT BLK WIRE BLK/BLU WIRE BLK/DK BLU WIRE BLK/YEL WIRE BLU/BLK WIRE BLU/GRN WIRE BRN/GRY WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/DK GRN WIRE DK GRN/WHT WIRE DOWN DOWN SW SIG DRIVER SEAT MEMORY SWITCH EXIT FORWARD SW SIG FUSE 6 GRN/WHT WIRE GRY/VIO WIRE HOT AT ALL TIMES ILL INSTRUMENT PANEL FUSE BLOCK LIN SERIAL DATA BUS 8 LOW SPEED GMLAN SERIAL DATA LIN DATA BUS 8 LT BLU/YEL WIRE LT GRN WIRE LT GRN/BRN WIRE MEM SEAT SW SET SIG MEM SEAT SW SIG (1) MEM SW LOW REF MTR FORWARD CTRL MTR REARWARD CTRL REARWARD SW SIG RED WIRE RED/BLU WIRE RED/BRN WIRE RED/DK BLU WIRE RWD SEAT MEMORY CONTROL MODULE SET- STEERING COLUMN POSITION CONTROL MODULE STEERING COLUMN TELESCOPE MOTOR STEERING COLUMN TILT MOTOR STEERING COLUMN TILT, TELESCOPE SWITCH SW LOW REF TELESCOPE MTR LOW REF TELESCOPE MTR SIG TILT MTR DOWN CTRL TILT MTR LOW REF TILT MTR SIGNAL TILT MTR UP CTRL UNDERHOOD FUSE BLOCK UP SW SIG VIO/GRY WIRE WHT WIRE WHT/BLK WIRE WNDW MIR SEAT FUSE YEL WIRE YEL/BLK WIRE YEL/BRN WIRE

BATT POS VOLT BLK WIRE BLK/YEL WIRE BLU WIRE BRN/BLK WIRE BRN/YEL WIRE COM CTRL DEFOGGER SYSTEM DK BLU/WHT WIRE DOWN DOWN CTRL DRIVER OUTSIDE REAR VIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REAR VIEW MIRROR GLASS DRIVER OUTSIDE REAR VIEW MIRROR MOTOR DRIVER OUTSIDE REAR- VIEW MIRROR DRIVER SIDE OBJECT DETECTION INDICATOR DRIVER WINDOW/ OUTSIDE REAR VIEW MIRROR SWITCH ELECTROCHROMIC MIRROR CIRCUIT GRN/BLK WIRE GRN/VIO WIRE GRY/GRN WIRE HOT AT ALL TIMES LEFT LEFT TURN SIGNAL REPEATER LAMP LOGIC MIRROR DIMMING NAVIGATION SYSTEM OFF PASSENGER OUTSIDE REAR VIEW MIRROR PASSENGER OUTSIDE REAR VIEW MIRROR COURTESY LAMP PASSENGER OUTSIDE REAR VIEW MIRROR GLASS PASSENGER OUTSIDE REAR VIEW MIRROR MOTOR PASSENGER SIDE OBJECT DETECTION INDICATOR RED/BLU WIRE RIGHT RIGHT TURN SIGNAL REPEATER LAMP UNDERHOOD FUSE BLOCK UP CTRL VIO/BLU WIRE WHT WIRE WNDW MIR SEAT FUSE YEL/BRN WIRE YEL/VIO WIRE YEL/WHT WIRE

BATTERY POSITIVE VOLT BLK WIRE BLK/YEL WIRE BLU/BLK WIRE BRN/GRY WIRE COMPUTER DATA LINES SYSTEM DK GRN/WHT WIRE DOWN SWITCH SIGNAL FORWARD SWITCH SIGNAL FUSE 6 GROUND GRY/VIO WIRE HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK LIN SERIAL DATA BUS 8 LOW REF LT BLU/YEL WIRE LT GRN/BRN WIRE REARWARD SWITCH SIGNAL RED/BRN WIRE STEERING COLUMN POSITION CONTROL MODULE STEERING COLUMN TELESCOPE MOTOR STEERING COLUMN TILT MOTOR STEERING COLUMN TILT, TELESCOPE SWITCH TELESCOPE MOTOR FORWARD CTRL TELESCOPE MOTOR LOW REF TELESCOPE MOTOR REARWARD CTRL TELESCOPE MOTOR SIGNAL TILT MOTOR DOWN CTRL TILT MOTOR LOW REF TILT MOTOR SIGNAL TILT MOTOR UP CTRL UP SWITCH SIGNAL VIO/GRY WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YEL/BRN WIRE