Buick LaCrosse II facelift (2013-2016) (front of air filter) Wiring diagrams

12 VOLTAGE BRAKE FLUD LVL SENS SIG BRK VACUUM SW SIG SERIAL DATA- SERIAL DATA + 5 VOLT REF BLK WIRE BLK/BLU WIRE BLK/GRY WIRE BLK/VIO WIRE BLK/YEL WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BRAKE BOOSTER PUMP MOTOR RELAY (RIGHT SIDE OF ENGINE COMPT) BRAKE FLUID LEVEL SWITCH (LEFT KICK (ON BRAKE FLUID PANEL) RESERVOIR) BRAKE PRESSURE MODULATOR BRAKE VACUUM SENS SIG WHL SPD SENS SIG LF LF WHL SPD SENS LOW REF BRN WIRE COMPUTER DATA LINES SYSTEM ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE FUSE 26 FUSE 41 GRN/BRN WIRE GRN/GRY WIRE GRY WIRE HOT AT ALL TIMES LEFT FRONT WHEEL SPEED SENSOR (LEFT FRONT STEERING KNUCKLE ASSEMBLY) LEFT REAR WHEEL SPEED SENSOR (LEFT REAR UPPER CONTROL ARM) LOW REFERENCE BATTERY + RED WIRE RED/BLU WIRE RED/GRY WIRE RED/YEL WIRE RIGHT FRONT WHEEL SPEED SENSOR SENS SIG RIGHT REAR LOW REF RIGHT REAR SERIAL DATA + SERIAL DATA - SERIAL DATA - SERIAL DATA + WHL SPD SENS SIG RF WHL SPD SENS LOW RF SERIAL DATA ENABLE WHL SPD SENS SIG LR WHL SPD SENS LOW REF LR UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE W/ CONTINUOUSLY VARIABLE REAL TIME DAMPING CHASSIS W/O CONTINUOUSLY VARIABLE REAL TIME DAMPING CHASSIS WHT WIRE WHT/BLU WIRE YEL WIRE YEL/RED WIRE YEL/VIO WIRE

2.4L 3.6L 5 VOLT REF BACKUP LAMPS CIRCUIT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/RED WIRE BLU/VIO WIRE BLU/YEL WIRE BRN (OR GRY) WIRE BRN GRY/ WIRE BRN WIRE COMPUTER DATA LINES SYSTEMS ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GROUND DISTRIBUTION SYSTEM GRY/BRN WIRE HI SPD GMLAN SRL DATA BUS+ HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV POWERTRAIN CONTROL MODULE LOGIC LOW REF PNK WIRE RIGHT BACKUP LAMP RIGHT FRONT PARK LAMP RIGHT FRONT TURN SIGNAL LAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP MULTIFUNCTION LED CONTROL MODULE RIGHT FRONT SIDE MARKER LAMP RIGHT PARK DAYTIME RUNNING LAMP RIGHT REAR SIDE MARKER LAMP RIGHT REAR TURN SIGNAL LAMP RIGHT TAIL LAMP ASSEMBLY RIGHT TAIL/STOP LAMP SENS SIG STARTER/GENERATOR CONTROL MODULE TURN SIGNAL/ MULTI-FUNCTION SWITCH USED) VIO WIRE W/ HID W/O HID WHT WIRE WHT/GRN WIRE WHT/ORG WIRE WHT/RED WIRE WHT/YEL WIRE

BLK WIRE BLK/WHT WIRE BLU WIRE BRAKE BOOSTER PUMP MOTOR RELAY BRN WIRE COOLING DISTANCE SENSING CRUISE CONTROL MODULE FAN SPEED CONTROL RELAY GRY WIRE HORN ASSEMBLY IGNITION MAIN RELAY LEFT DAYTIME RUNNING LAMP, LEFT FRONT HOOD FOG AJAR LAMP SWITCH LEFT FRONT PARK LAMP (IF EQUIPPED) ACTIVE GRILL AIR SHUTTER ACTUATOR LEFT FRONT SIDE LEFT HEADLAMP MARKER BALLAST LAMP LEFT HEADLAMP HORIZONTAL MOTOR LEFT LEFT COOLING COOLING FAN FAN DIODE DIODE LOW SPEED COOLING FAN DIODE RIGHT DAYTIME RUNNING LAMP RIGHT FRONT FOG LAMP RIGHT FRONT PARK LAMP RIGHT FRONT SIDE MARKER LAMP RIGHT FRONT TURN SIGNAL LAMP RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP BALLAST RIGHT HEADLAMP HORIZONTAL MOTOR RIGHT HEADLAMP MULTI-FUNCTION LED CONTROL MODULE RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT LOW BEAM HEADLAMP RIGHT RIGHT FRONT FRONT SIDE TURN MARKER SIGNAL LAMP LAMP W/ ADAPTIVE CRUISE CONTROL W/ HID W/O HID WINDSHIELD WASHER FLUID LEVEL SWITCH WINDSHIELD WASHER PUMP WINDSHIELD WASHER PUMP RELAY

1 2 33 32 RF DRL SPLY VOLT LF DRL SPLY VOLT 2 3 2540 2140 B+ B+ 22 10 5060 278 DATA LINES LOW SPD GMLAN SER DATA SYSTEM AMBIENT LIGHT SENS SIG 22 11 16 13 306 103 HDLP SW PARK LP SIG AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BCM 4 BCM 1 FUSE FUSE BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BRN WIRE BLU/GRN WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER CRUISE CONTROL, SOUND SYSTEMS FOG LAMP FUSE FRONT FOG GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/BLU WIRE HDLP DIMMER SW HI BEAM SIG HDLP OFF SIG CTRL HDLP SW ON SIG HDLP SW FLASH TO PASS SIG HEADLAMP HIGH BEAM RELAY HEADLAMP LOW BEAM RELAY HEADLAMPS LEVELING CIRCUIT HIGH LOW FTP HOT AT ALL TIMES HOT AT ALL TIMES BATTERY FUSE BLOCK FUSE (TOP OF BATTERY) HVAC CONTROL MODULE INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LAMP RELAY LED CONTROL MODULE LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP BALLAST LEFT HEADLAMP MULTIFUNCTION LED CONTROL MODULE LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LEFT PARK/DAYTIME RUNNING LAMP LIGHTING CTRL SW REF LIGHTING CTRL SW SIG LOW REF LT HI BEAM FUSE RT HI BEAM FUSE RT HID FUSE LT HID FUSE NCA WIRE ORG/ WIRE RED WIRE RED/BLK WIRE RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP BALLAST RIGHT HEADLAMP MULTIFUNCTION RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT LOW BEAM HEADLAMP RIGHT PARK/DAYTIME RUNNING LAMP TO WINDSHIELD WIPER MOTOR) TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO BRN/ WIRE VIO WIRE WHT WIRE YEL WIRE

AUTO BLK WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DIMMER SWITCH DRIVER INFORMATION CENTER DISPLAY FOG LAMP SWITCH FRONT FOG LAMP IND GRN WIRE GRY WIRE GRY/RED WIRE HEAD PARK HEADLAMP SWITCH HIGH BEAM LAMP IND INSTRUMENT CLUSTER LEFT FRONT FOG LAMP LOGIC LOW SPD GMLAN SER DATA LT GRN WIRE OFF PARK BRAKE CONTROL SWITCH PARK BRK RELEASE SW SIG PARK BRK SW SIG PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) RIGHT FRONT FOG LAMP VIO WIRE VOL REF PARK BRK SPLY VOLT WHT WIRE YEL WIRE YEL/RED WIRE

1 2 312 712 RH HDLP LO BEAM SPLY V LH HDLP LO BEAM SPLY V 16 11 22 HDLP SW ON SIG 23 18 10 DRL RELAY CTRL HDLP HI BEAM RLY CTRL FOG LAMP RLY CTRL 23 24 HI SPD GMLAN SER DATA (-) HI SPD GMLAN SER DATA (+) AMBIENT LIGHT SENS SIG AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BLK WIRE BLU/BRN WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE FOG LAMP FUSE FRONT FOG LAMP FTP FUSE GRN WIRE GROUND GRY WIRE GRY/BLU WIRE HDLP DIMMER SW HI BEAM SIG HDLP OFF SIG CTRL HDLP SW PARK LP SIG HDLP SW FLASH TO PASS SIG HEADLAMP HIGH BEAM RELAY HEADLAMP LOW BEAM RELAY HI BEAM HI BEAM RT HID HVAC CONTROL MODULE LEFT DAYTIME RUNNING LAMP, LEFT HEADLAMP ASSEMBLY LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LH FUSE RH FUSE FUSE LIGHTING CTRL SW REF LIGHTING CTRL SW SIG LOW REF LT HID RED WIRE RED/BLK WIRE RELAY RIGHT HEADLAMP ASSEMBLY RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT DAYTIME RUNNING LAMP RIGHT LOW BEAM HEADLAMP TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE WHT WIRE WHT/BRN WIRE WINDSHIELD WIPER MOTOR YEL WIRE

2500 2501 1134 7684 COMPUTER DATA LINES SYSTEM BATTERY FUSE BLOCK (TOP OF BATTERY) BLK WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DIMMER SWITCH DRIVER INFORMATION CENTER DISPLAY FOG LAMP SWITCH FRONT FOG LAMP IND FUSE GRN WIRE GROUND GRY WIRE GRY/RED WIRE HEAD PARK AUTO HEADLAMP SWITCH HIGH BEAM LAMP IND HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN INSTRUMENT CLUSTER LEFT FRONT FOG LAMP LOGIC LOW SPD GMLAN SER DATA LT GRN WIRE MIL IGN OFF PARK BRAKE CONTROL SWITCH PARK BRK APPLY SW SIG PARK BRK RELEASE SW SIG PARK BRK RELEASE SW VOL REF PARK BRK SW SPLY VOLT PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) RED WIRE RIGHT FRONT FOG LAMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/GRY WIRE WHT WIRE WHT/BRN WIRE YEL WIRE YEL/RED WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 GROUND 1 2 3 B+ B+ 2501 2500 COMPUTER DATA LINES SYSTEM AFL BATT FUSE AFL MTR FUSE BLK WIRE BLU WIRE BRN WIRE COMPUTER DATA LINES SYSTEM GRN/VIO WIRE GRY WIRE HEADLAMP CONTROL MODULE (LOWER LEFT SIDE OF DASH BEHIND BODY CONTROL MODULE) HI SPD GMLAN SER DATA (-) HI SPD GMLAN SER DATA (+) SER DATA COMM HOT AT ALL TIMES INT N/W BUS 6 INT N/W BUS 6 B+ B+ GND 3 1 2 4 LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP BALLAST LEFT HEADLAMP HORIZONTAL MOTOR NETWORK BUS 6 ORG/ WIRE RED WIRE RED/YEL WIRE RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP BALLAST RIGHT HEADLAMP HORIZONTAL MOTOR UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT WIRE WHT/BRN WIRE YEL WIRE