Buick LaCrosse II facelift (2013-2016) computer data lines system Wiring diagrams

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

24 8 SENS LO REF ENG TEMP SENS SIG GND BATT POS VOLT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BLU WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COOLING FAN HIGH SPEED RELAY COOLING FAN LOW SPEED RELAY COOLING FAN SPEED CONTROL RELAY DK BLU WIRE DRIVER INFORMATION CENTER DISPLAY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) ENGINE COOLANT TEMPERATURE GAUGE ENGINE COOLANT TEMPERATURE IND FUSE FUSE 42 GMLAN SERIAL DATA GRN WIRE GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) HOT W/ ENGINE CONTROL IGNITION RELAY ENERGIZED INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) IPC FUSE LEFT COOLING FAN DIODE LEFT COOLING FAN MOTOR (BEHIND LEFT SIDE OF RADIATOR) LOGIC LOW SPD LOW SPEED COOLING DIODE LT GRN/VIO WIRE RED/BLK WIRE RED/BRN WIRE RED/WHT WIRE RIGHT COOLING FAN MOTOR (BEHIND RIGHT SIDE OF RADIATOR) WHT WIRE WHT/BLU WIRE YEL WIRE

2.4L HYBRID 3.6L 5382 5380 5381 68 48 47 LOW REF BRAKE POS SENS SIG 7 13 BRAKE APPLY SENS SIG SUPPLY VOLTAGE ACTUATOR CTRL CLOSE ACTUATOR CTRL OPEN ADAPTIVE CRUISE SWITCH BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE PEDAL POSITION SENSOR (NEAR TOP OF ACCELERATOR PEDAL ASSEMBLY) BRN/LT GRN WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SW SIG CRUISE SWITCH CRUISE/ETC/TCC BRK SIG ECM IGN FUSE ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GMLAN SERIAL DATA GMLAN SERIAL DATA - 34 70 54 2701 3630 2752 GRN WIRE GRN/WHT WIRE GROUND GRY WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IPC FUSE LEFT STEERING WHEEL CONTROLS SWITCH LIGHTING CTRL SW REF LOGIC LOW REF LOW REF 2 POSITIVE VOLTAGE RED/BLK WIRE RED/WHT WIRE RES+ SENS SIG LOW REF SET- SIG 1 LOW REF 1 SIG 2 STEERING WHEEL AIR BAG COIL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/LT GRN WIRE W/ ADAPTIVE CRUISE CONTROL W/O ADAPTIVE CRUISE CONTROL WHT WIRE WHT/DK BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/WHT WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 BATT POS VOLT 3 7 HI SPD GMLAN (+) HI SPD GMLAN (-) 3.6L 2.4L HYBRID ACCELERATOR PEDAL POSITION SENSOR (LEFT SIDE OF DASH) BLK WIRE BLK/BLU WIRE BLK/VIO WIRE BLK/YEL WIRE BRK POS SENS SIG LOW REF BRN/RED WIRE COMM ENABLE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY AUTOMATIC TRANSMISSION ASSEMBLY CRUISE IND DISTANCE SENSING CRUISE CONTROL MODULE (BEHIND UPPER GRILLE OPENING) DK BLU WIRE DK BLU/YEL WIRE DRIVER INFORMATION CENTER DISPLAY GRN/WHT WIRE GROUND HOT AT ALL TIMES HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV POWERTRAIN CONTROL MODULE INSTRUMENT CLUSTER LOGIC LRR LDW FUSE MOST SERIAL DATA (+) POSITIVE VOLTAGE RED/BLK WIRE RED/GRY WIRE SER DATA (-) SER DATA (+) SER DATA (-) SER DATA (+) STARTER/GENERATOR CONTROL MODULE SYSTEM TRANSMISSION CONTROL MODULE TRANSMISSION INPUT SHAFT SPEED SENSOR TRANSMISSION OUTPUT SHAFT SPEED SENSOR UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT WIRE WHT/DK BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/WHT 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 BATTERY SOL CTRL 1 2 3 4 5 6 DATA (-) DATA (-) DATA (+) DATA (+) VOLT GND 2.4L 3.6L 9 8 17 DATA + DATA - SPLY VOLT ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLK/YEL WIRE BLU WIRE BLU/YEL WIRE BRN/GRN WIRE BRN/LT GRN 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 IGN INSTRUMENT CLUSTER LOGIC POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) RED WIRE RED/DK BLU WIRE SERIAL DATA (-) SERIAL DATA (+) SHAFT SPEED SENSOR SOL LO REF STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SYSTEM TRANS- MISSION OUTPUT TRANSMISSION CONTROL MODULE (TCM) UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) W/ ADAPTIVE CRUISE CONTROL WHT WIRE WHT/DK BLU WIRE

135 MM FROM BREAKOUT TO 6105 6105 6106 6106 COMPUTER DATA LINES SYSTEM AWD/SADS FUSE BLK WIRE BLK/BRN WIRE BLU WIRE BLU/BLK WIRE BLU/YEL WIRE BRN WIRE BRN/DK BLU WIRE BRN/LT GRN WIRE BRN/RED WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/GRY WIRE DK GRN/GRY WIRE DRIVER INFORMATION CENTER DISPLAY GMLAN SER DATA (+) GMLAN SER DATA (+) GMLAN SER DATA (-) GMLAN SER DATA (-) GRN WIRE GRN/RED WIRE GRY/BLU WIRE GRY/DK BLU WIRE GRY/RED WIRE GRY/WHT WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT FRONT SHOCK ABSORBER ACTUATOR LEFT FRONT VERTICAL BODY ACCELERATION SENSOR (LEFT FRONT STRUT TOWER) LEFT REAR SHOCK ABSORBER ACTUATOR LF WHL ACC LOW REF LOGIC LT GRN WIRE LT GRN/GRY WIRE LT GRN/VIO WIRE NCA WIRE ORG/ WIRE PACK) PNK/BLK WIRE REAR VERTICAL BODY ACCELERATION SENSOR (FRONT OF REAR COMPT) RED/GRY WIRE RIGHT FRONT SHOCK ABSORBER ACTUATOR RIGHT FRONT VERTICAL BODY ACCELERATION SENSOR (RIGHT FRONT STRUT TOWER) RIGHT REAR SHOCK ABSORBER ACTUATOR SUSPENSION CONTROL MODULE (LEFT CORNER OF REAR COMPT) UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE WHT WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/VIO WIRE WHT/YEL WIRE YEL WIRE YEL/RED BLK/BRN WIRE YEL/RED WIRE

2500 2501 COMPUTER DATA LINES SYSTEM 7493 7494 COMPUTER DATA LINES SYSTEM A/C SENS SIG ACCELERATOR PEDAL POSITION SENSOR (LEFT SIDE OF DASH) APP SENS SIG 1 APP SIG BLK/BLU WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CHECK ENG IND CTRL COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM CRUISE CONTROL SYSTEM DK BLU WIRE DK BLU/BRN WIRE DK BLU/GRN WIRE DK BLU/GRY WIRE DK BLU/LT GRN WIRE DK BLU/WHT WIRE ENG RLY CTRL IGN 1 VOLT ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EVAPORATIVE EMISSION VENT SOLENOID VALVE (UNDER LEFT REAR OF VEHICLE) FAN RLY CTRL FUEL LVL SEN SIG FUEL LVL SENS LO REF FUEL PRES SENS SIG FUEL PUMP FUEL PUMP RLY CTRL GRN WIRE GRN/GRY WIRE GRN/WHT WIRE GRY WIRE HI SER DATA BUS (+) HI SER DATA BUS (-) IGN 1 VOLT B+ PDL POS LOW REF IGN STARTER RLY CTRL LEVEL SENSOR ASSEMBLY (IN FUEL TANK) LOW REF LT GRN WIRE LT GRN/DK BLU WIRE LT GRN/VIO WIRE PDL POS LOW REF RED/BRN WIRE RED/GRN WIRE RED/LT GRN WIRE SNSR SIG SOLENOID CTRL SOLENOID CTRL SOLENOID CTRL CRUISE/ETC/TCC BRAKE SIG STARTING/CHARGING SYSTEM VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE VIO/YEL WIRE WAKE-UP SER DATA WHT WIRE WHT/DK BLU WIRE WHT/RED WIRE YEL WIRE YEL/RED WIRE YEL/WHT WIRE

A/C COMPRESSOR CLUTCH RELAY ACTIVE GRILLE AIR SHUTTER ACTUATOR (LEFT SIDE OF FRONT BUMPER LOWER GRILLE) AUXILIARY HEATER COOLANT PUMP RELAY AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP RELAY BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/WHT WIRE BLU/YEL WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CANN VENT FUSE CHASSIS CONTROL MODULE (REAR COMPT, RIGHT REAR CORNER, BEHIND TRIM PANEL) COMMUNICATION ENABLE COMPUTER DATA LINES SYSTEM COOLING FAN HIGH SPEED RELAY DK BLU WIRE DK BLU/BRN WIRE ECM BATT FUSE ECM IGN FUSE FLP SENS FPP RLY CTRL FROM ENGINE CONTROL IGNITION RELAY (DIAGRAM 4 OF 5) FSCM FUSE FUEL PRESSURE SENSOR (IN FUEL TANK) GMLAN SERIAL DATA DRIVER INFORMATION CENTER (DIC) DISPLAY GRN WIRE GRN/GRY WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/DK BLU WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN IGN 1 VOLT IGN OIL PRESSURE IND MIL IND INSTRUMENT CLUSTER LOGIC LOGIC LOW REF LT GRN/DK BLU WIRE NCA WIRE PRESS SENS SIG RED/BRN WIRE RED/LT GRN WIRE RED/VIO WIRE RUN/CRANK SAIR PUMP FUSE SAIR SOL FUSE SECONDARY AIR INJECTION PUMP RELAY SECONDARY AIR INJECTION SOLENOID VALVE RELAY SERIAL DATA SHIELD EXTENSION SHUTTER VALVE SOL CTRL SPLY VOLT FUEL PUMP TRN BDY FSC RC IGN IGN FUSE FUSE VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE WHT WIRE WHT/BLU WIRE YEL WIRE