Buick LaCrosse II facelift (2013-2016) red/yel 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 FLEX FUEL 3.6L FLEX FUEL 2.4L AUTOMATIC TRANSMISSION ASSEMBLY BATT RVC FUSE BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GRN WIRE GRN/WHT WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES INSIDE REARVIEW MIRROR LEFT BACKUP LAMP LEFT TAIL TAIL LAMP ASSEMBLY LEFT TAILLAMP ASSEMBLY PARK/NEUTRAL SIG REARVIEW CAMERA (W/ MONO REARVIEW VISION) RED WIRE RED/YEL WIRE RIGHT BACKUP LAMP RIGHT TAIL TAIL LAMP ASSEMBLY SIG A SIG B SIG C SIG P SUPPLY VOLT TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/YEL WIRE WAKE UP SIG WHT GRN/ WIRE WHT WIRE WHT/GRY WIRE YEL WIRE

11 12 IG MODE SW CTRL LOW REF 3 4 ACC VOLT RUN/CRANK 1 VOLT 307 3287 HEADLIGHTS SYSTEM HORNS SYSTEM 664 94 EXTERIOR LIGHTS SYSTEM WIPER/WASHER SYSTEM ACC IND ACCESSORY LED SIGNAL LIGHTING CONTROL SW SIG AMBIENT LIGHT SENSOR SIGNAL SW SIG ANTI-LOCK BRAKES SYSTEM DOOR LOCKS, ANTI-THEFT SYSTEMS ANTI-LOCK BRAKES, CRUISE CONTROL SYSTEMS ANTI-THEFT SYSTEM HEADLIGHTS SYSTEM BATT RVC FUSE BATTERY POSITIVE VOLT BCM 1 BCM 4 BCM 2 FUSE FUSE FUSE BCM 3 FUSE BCM 6 FUSE BCM 7 FUSE (LOWER LEFT SIDE OF DASH) BCM 8 FUSE BLK WIRE BLK/BRN WIRE BLU WIRE BLU/YEL WIRE BRAKE APPLY SENSOR SIGNAL LED BACKLIGHT DIMMING CTRL BRN WIRE BRN/LT GRN WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/BLK WIRE DK BLU/WHT WIRE DOOR LOCKS, ANTI-THEFT SYSTEMS DRIVER DR LK SW LOCK SIG EXTERIOR LIGHTS SYSTEM DOOR LOCKS, ANTI-THEFT SYSTEMS GRN WIRE GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN WIRE HAZARD SW TURN RIGHT SIG WINDSHIELD WASHER SW SIG HDLP SW FLASH TO PASS SIG HORN SWITCH SIGNAL HEADLAMP OFF SIG HEADLAMP SW ON SIG HAZARD LED DIMMING SIGNAL HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM TRANSMISSIONS SYSTEM HEADLIGHTS, INTERIOR LIGHTS SYSTEMS HOT AT ALL TIMES IGNITION KEY RESISTOR SIG IGNITION MODE SWITCH INSTRUMENT PANEL FUSE BLOCK INTERIOR LAMP DEFEAT SW SIG KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) OFF/RUN/CRANK VOLT RED WIRE RED/BLK WIRE RED/BRN WIRE RED/GRN WIRE RED/VIO WIRE RED/WHT WIRE RED/YEL WIRE SHIFT INTERLOCK SYSTEM START IND UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/BLK WIRE VIO/YEL WIRE W/ KEYLESS ENGINE START WHT WIRE WINDSHIELD WIPER SW HI SIG WIPER/WASHER SYSTEM YEL WIRE

1 2 3 4 5 6 7 INTERIOR LAMP CONTROL BACKUP LAMP SPLY VOLT INADVERTENT POWER CTRL 1969 28 HEADLIGHTS SYSTEM HORNS SYSTEM 2500 2501 COMPUTER DATA LINES SYSTEM 3268 156 ANTI-THEFT SYSTEMS 5077 7541 STARTING/CHARGING SYSTEM EXTERIOR LIGHTS SYSTEM 544 860 HEADLIGHTS SYSTEM WIPER/WASHER SYSTEM 5797 6132 TRUNK, TAILGATE, FUEL DOORS SYSTEM COMPUTER DATA LINES SYSTEM 5911 3271 2150 294 1303 DOOR LOCKS, ANTI-THEFT SYSTEMS 5996 6817 EXTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM 6133 6134 COMPUTER DATA LINES SYSTEM 7553 737 SHIFT INTERLOCK SYSTEM INTERIOR LIGHTS SYSTEM ANTI-THEFT SYSTEM BATTERY BATTERY CURRENT SENSOR (IN FRONT OF BATTERY) BLK WIRE BLK/VIO WIRE BLU WIRE BLU/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/GRY WIRE BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CHILD SECURITY LCK MTR COURTESY LAMP SW SIG CHILD SECURITY LCK MTR SHIFT POSITION SIG CHILD SECURITY LOCK RLY CTRL DK BLU/WHT WIRE DOOR LOCKS, ANTI-THEFT SYSTEMS DOOR LOCKS, ANTI-THEFT SYSTEMS 3269 5905 DRL RLY CTRL WINDSHIELD WIPER SW HI SIG FOG LAMP RELAY CONTROL LIFT GLASS/TRUNK RELEASE CTRL CRUISE/ETC/TCC BRAKE SIGNAL GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/LT GRN WIRE GRY/YEL WIRE HEADLAMP HIGH BEAM RLY CTRL HORN RLY CTRL HEADLAMP LOW BEAM RLY CTRL HEADLIGHTS SYSTEM HI SPEED GMLAN DATA BUS (+) HI SPEED GMLAN DATA BUS (-) HOT AT ALL TIMES IGNITION SWITCH INTERCONNECT NETWORK BUS 2 INTERCONNECT NETWORK BUS 3 INTERIOR LIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM KEY-IN IGNITION SWITCH LED AMBIENT LIGHTING CTRL 1 LOW REFERENCE STOP LAMP SPLY VOLT OFF RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RR CLOSURE HANDLE SW OPEN SIG INTERCONNECT NETWORK BUS 1 RUN WIRE SHIFT INTERLOCK SYSTEM SOLENOID CTRL TRUNK LAMP CONTROL STARTING/CHARGING SYSTEM STARTING/CHARGING SYSTEM COMPUTER DATA LINES SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM VIO WIRE VIO/GRY WIRE VIO/YEL WIRE WHT WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/VIO WIRE WHT/YEL WIRE YEL WIRE YEL/DK BLU WIRE

1 2 3 4 5 6 DATA (-) DATA (-) DATA (+) DATA (+) VOLT GND 1 2 BATTERY GND ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BATTERY FUSE BLOCK (TOP OF BATTERY) BLK WIRE BLU WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DATA (+) DATA (-) SPLY VOLT DK BLU WIRE DK BLU/YEL WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE GRN WIRE GRN/BRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LOGIC LT GRN WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) POWER STEERING MOTOR POWER STEERING SHAFT TORQUE SENSOR RED/YEL WIRE SENS SIG SENS RTN STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SYSTEM TRANSMISSION CONTROL MODULE (TCM) 2.4L 3.6L TRANSMISSION OUTPUT SHAFT SPEED SENSOR W/ ADAPTIVE CRUISE CONTROL WHT WIRE WHT/DK BLU WIRE WHT/YEL WIRE YEL WIRE YEL/BLK WIRE

1 2 3 4 5 6 DATA (-) DATA (-) DATA (+) DATA (+) VOLT GND 1 2 GND BATTERY 2.4L 3.6L 2500 2500 2501 2501 COMPUTER DATA LINES 9 8 17 DATA + DATA - SPLY VOLT ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BATTERY FUSE BLOCK (TOP OF BATTERY) BLK WIRE BLU WIRE BLU/YEL WIRE BRN WIRE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE GRN WIRE GRN/BRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LOGIC LT GRN WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) POWER STEERING MOTOR (ON STEERING GEAR) POWER STEERING SHAFT TORQUE SENSOR RED/YEL WIRE SENS SIG SENS RTN STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SYSTEM TRANSMISSION CONTROL MODULE (TCM) TRANSMISSION OUTPUT SHAFT SPEED SENSOR W/ ADAPTIVE CRUISE CONTROL WHT WIRE WHT/DK BLU WIRE YEL WIRE YEL/BLK 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

BLK WIRE BLK/BLU WIRE BLU/GRN WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE BRN/WHT WIRE DOWN DOWN FWD DRIVER SEAT ADJUSTER SWITCH DRIVER SEAT LUMBAR SUPPORT PUMP DRIVER SEAT MEMORY SWITCH GRN WIRE GRN/BRN WIRE GRN/GRY WIRE GRY/BLK WIRE GRY/GRN WIRE MEM MEM SEAT SW SET SIG MEM SW LOW REF MEM SEAT SW SIG (1) RED/YEL WIRE RIGHT REAR HAPTIC SEAT MTR CTRL LEFT REAR HAPTIC SEAT MTR CTRL RWD RWD UP USED) VERTICAL MTR POS SNSR SIG RECLINE MTR POS SNSR SIG VIO WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/WHT WIRE

AUTO DISCONNECT CONTROL AUX WKUP SERIAL DATA AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP BLK WIRE BLK/DK BLU WIRE BLK/YEL WIRE BRAKE POSITION BRK POS SNSR LOW REF BRK POS SNSR SIG BRN WIRE BRN/LT GRN WIRE COMPUTER DATA LINES SYSTEM COOLANT PUMP RELAY COIL CONTROL DISCONNECT SUPPLY VOLTAGE DK BLU WIRE DK BLU/VIO WIRE DK BLU/WHT WIRE DRIVER MOTOR CONTROL MODULE 1 STARTER/GENERATOR CONTROL MODULE FUSE GRY WIRE GRY/BLK WIRE GRY/VIO WIRE GRY/YEL WIRE HOT AT ALL TIMES UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV POWERTRAIN CONTROL MODULE LT GRN WIRE LT GRN/DK BLU WIRE LT GRN/WHT WIRE MM TO BODY HARNESS) NCA WIRE ORG/ WIRE PNK WIRE PPL RED WIRE RED/YEL WIRE RELAY RESOLVER COSINE SIGNAL DRAIN WIRE RESOLVER MOTOR DRAIN WIRE RESOLVER MOTOR NEGATIVE RESOLVER SINE SIGNAL DRAIN WIRE STARTER/GENERATOR THREE PHASE MOTOR TEMP DRAIN WIRE TRANS AUX PMP FUSE TRANSMISSION AUXILIARY OIL PUMP RLY CTRL U PHASE V PHASE VIO WIRE VIO/YEL WIRE W PHASE WHT WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE

3 2 1 FAN SPD SIG 1 FAN SPD SIG 2 GROUND 5 4 BATT POS VOLT FAN SPD SNSR SUPPLY VOLT ACCESSORY WAKEUP AJAR SW SIG AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP BATT POS VOLT BATT RVC FUSE BATTERY ENERGY CONTROL MODULE BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BPIM BATT FUSE BPIM IGN FUSE BRN/LT GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COOLANT TEMP SNSR SIG SNSR LOW REFERENCE CURRENT SNSR LOW CURRENT SNSR SIG CURRENT SNSR SPLY DK BLU WIRE DK BLU/GRY WIRE FAN SPEED SNSR SUPPLY VOLT BATT POSITIVE VOLTAGE SERIAL DATA (+) SERIAL DATA (+) FROM HYBRID/ EV BATTERY SECTION 2 (DIAGRAM 4 OF 4) GRN WIRE GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HIGH SER DATA HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV BATTERY PACK CABLE COVER HYBRID/EV BATTERY PACK CURRENT SENSOR HYBRID/EV POWERTRAIN CONTROL MODULE STARTER/GENERATOR CONTROL MODULE LOGIC HYBRID/EV BATTERY PACK COOLING FAN LOW SER DATA LT GRN/VIO WIRE LT GRN/WHT WIRE MAIN CONTACTOR MGU CLT PMP FUSE NCA WIRE ORG/ WIRE P-P BLOWER FUSE PRE-CHARGE CONTACTOR RED WIRE RED/BLK WIRE RED/DK BLU WIRE RED/VIO WIRE RED/YEL WIRE REFERENCE RUN/CRANK IGN 1 SER DATA SERIAL DATA SERIAL DATA (+) SERIAL DATA (-) BATT POSITIVE VOLTAGE STARTER/ GENERATOR COOLANT PUMP RELAY STARTER/GENERAROR COOLANT TEMPERATURE SENSOR (RIGHT FRONT SIDE OF ENGINE COMPT) UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/WHT WIRE VIO/YEL WIRE WHT BLU/BLK WIRE WHT WIRE WHT/YEL WIRE YEL/GRN WIRE