Buick LaCrosse II facelift (2013-2016) lt grn Wiring diagrams

A/C ON IND A/C ON SWITCH AMBIENT AIR TEMPERATURE SENSOR (LEFT FRONT OF VEHICLE AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) ANTI-THEFT SYSTEM HEADLIGHTS SYSTEM BATT POS BLK WIRE BLK/DK BLU WIRE BLU WIRE BRN/LT GRN WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DATA DEFROST SWITCH DISPLAY DISPLAY DK BLU BLK/ WIRE DK BLU/GRY WIRE DOWN AIR OUTLET IND DOWN AIR OUTLET SWITCH DRIVER INFORMATION CENTER DISPLAY ENGINE COOLANT TEMPERATURE GAUGE ENGINE COOLANT TEMPERATURE IND FAN DOWN SWITCH FAN UP SWITCH GMLAN GRN WIRE GRN/YEL WIRE GRY WIRE HVAC CONTROLS INSTRUMENT CLUSTER LEFT COOLING FAN MOTOR LOGIC LOW REF LOW SPD LT GRN WIRE LT GRN/VIO WIRE ON BUMPER FASCIA) RECIRCULATION IND RECIRCULATION SWITCH RED/BLK WIRE RED/BLU WIRE RED/VIO WIRE RIGHT COOLING FAN MOTOR SENS SIG SERIAL UP AIR OUTLET IND UP AIR OUTLET SWITCH UPPER AIR OUTLET IND UPPER AIR OUTLET SWITCH VOLT W/ ONSTAR W/O ONSTAR WHT/BLU WIRE WINDSHIELD WINDSHIELD DEFROST IND YEL WIRE

518 520 LOWER LEFT AIR TEMP SENS SIG LOWER RIGHT AIR TEMP SENS SIG A/C LOW REF A/C SENS SIG AFTER BOIL HTR RLY CTRL AIR INLET DOOR ACTUATOR (RIGHT SIDE OF HVAC MODULE) AIR RECIRCULATION DOOR ACTUATOR (MOUNTED TO HVAC MODULE) BATT+ VOLT BLK WIRE BLK/BRN WIRE BLK/GRY WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRN/GRN WIRE BRN/RED WIRE BRN/YEL WIRE CMPRSR CLUTCH RLY CTRL COMPUTER DATA LINES SYSTEM DK BLU WIRE ENG TEMP SENS SIG ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GMLAN SERIAL DATA GRN WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/RED WIRE GRY/WHT WIRE HI SPD FAN RLY CTRL HVAC CONTROL MODULE LEFT AIR TEMPERATURE DOOR ACTUATOR (LEFT SIDE OF HVAC ASSEMBLY) LO SPD FAN RLY CTRL LOGIC LT GRN WIRE LT GRN/VIO WIRE MODE DOOR ACTUATOR (LOWER LEFT SIDE OF HVAC ASSEMBLY) ORG/BLU WIRE PNK WIRE PPL/BLK WIRE RED/BLK WIRE RED/BLU WIRE RED/BRN WIRE RED/GRN WIRE RIGHT AIR TEMPERATURE DOOR ACTUATOR (RIGHT SIDE OF HVAC MODULE) SENS LO REF SENS LOW REF SIG GND VIO/GRY WIRE WHT WIRE WHT/GRY WIRE WHT/PNK WIRE WHT/RED WIRE WHT/VIO WIRE YEL WIRE YEL/GRN WIRE YEL/GRY WIRE YEL/RED 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

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

4 6 NETWORK BUS 3 AJAR SW SIG ACTR RECEIVE SIG ACTR RTN ACTR SPLY VOLT ACTR TRANSMIT SIG AJAR SW SIG ANT LO REF (2) ANT LO REF (5) ANT SIG (1) ANT LO REF (1) ANT SIG (2) ANT SIG (5) BLK WIRE BLK/BRN WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM LOGIC DK BLU WIRE DK BLU/VIO WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER EXTERIOR DOOR HANDLE SWITCH DRIVER INFORMATION CENTER DISPLAY SECURITY IND DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH GMLAN SERIAL DATA GRN WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/DK BLU WIRE GRY/YEL WIRE INSTRUMENT CLUSTER KEYLESS ENTRY ANTENNA KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR EXTERIOR DOOR HANDLE ASSEMBLY LEFT REAR EXTERIOR DOOR HANDLE SWITCH LT GRN WIRE LT GRN/WHT WIRE LT GRN/YEL WIRE NETWORK BUS 3 ORG/ WIRE PACK) PASS DR UNLATCH SW SIG DRV DR UNLATCH SW SIG PASSENGER DOOR HANDLE KEYLESS ENTRY ANTENNA PASSENGER EXTERIOR DOOR HANDLE SWITCH PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) REAR FASCIA KEYLESS ENTRY ANTENNA (IF EQUIPPED) (BEHIND REAR BUMPER) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER (ON PASSENGER SIDE C-PILLAR) RIGHT REAR EXTERIOR DOOR HANDLE ASSEMBLY RIGHT REAR EXTERIOR DOOR HANDLE SWITCH STATUS CTRL UNLOCK SIGNAL VIO WIRE VIO/GRY WIRE WHT/GRN WIRE WHT/VIO WIRE YEL WIRE YEL/DK BLU 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

BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRY WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLU/YEL WIRE CNRK POS SENS SIG CRANKSHAFT POSITION SENSOR (RIGHT SIDE OF ENGINE) DK BLU/VIO WIRE DK BLU/WHT WIRE ECT SENS SIG ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) ENGINE COOLANT TEMPERATURE SENSOR (BEHIND EXHAUST MANIFOLD) ENGINE OIL PRESSURE SWITCH (FRONT OF ENGINE) EXHAUST BANK 1 SIG EXHAUST CAMSHAFT POSITION SENSOR (RIGHT REAR OF ENGINE BELOW CAMSHAFT COVER) GRY/DK BLU WIRE GRY/YEL WIRE HIGH CTRL HIGH PRESSURE FUEL PUMP IC 1 CTRL IC 2 CTRL IC 3 CTRL IC 4 CTRL INTAKE BANK 1 SIG INTAKE CAMSHAFT POSITION SENSOR (LEFT FRONT CORNER OF CYLINDER HEAD) LOW CTRL LOW REF LT BLU WIRE LT GRN WIRE LT GRN/DK BLU WIRE NCA WIRE OIL PRESSURE SW SIG SPARK PLUG VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE YEL WIRE YEL/DK BLU WIRE YEL/VIO 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

37 18 19 (NOT USED) 5-VOLT REF 1 A/C REFRIGERANT PRE SNSR LO REF A/C COMPRESSOR CLUTCH RLY CTRL APP 5-VOLT REF 3 (2) APP SIG (2) A/C REFRIGERANT PRE SENS SIG ACCELERATOR PEDAL POSITION SENSOR (LEFT SIDE OF DASH) AIR CONDITIONING SYSTEM APP 5-VOLT REF 4 (1) APP SIG (1) APP LO REF (1) BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLK/YEL WIRE BLU/GRY WIRE BLU/WHT WIRE BRAKE POSITION SNSR SIG BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CHECK ENGINE INDICATOR CTRL COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM DK BLU WIRE DK BLU/GRN WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) ENGINE OIL ENGINE OIL PRESSURE IND LEVEL IND FUEL COMPOSITION SENSOR FUEL PUMP CTRL GRN WIRE GRN/GRY WIRE GRN/WHT WIRE GRY WIRE HI SPEED COOLING FAN RLY CTRL IGN INSTRUMENT CLUSTER LEFT FRONT STRUT TOWER) LO SPD GMLAN SERIAL DATA LOGIC LOW REF FUEL TANK PRE SNSR SIG LT GRN WIRE MALFUNCTION IND PRIMARY FUEL LEVEL SNSR SIG FUEL LEVEL SNSR LO REF SECONDARY FUEL LEVEL SNSR SIG RED/BRN WIRE RUN/CRANK IGNITION 1 VOLT BATTERY POSITIVE VOLTAGE APP LO REF (2) SECONDARY FUEL LEVEL SENSOR (AWD) (TOP OF FUEL TANK) SENS SIG SENS SIG BAROMETRIC PRESSURE SNSR SIG SIG SUPPLY VOLT SENS GND VIO/DK BLU WIRE VIO/LT GRN WIRE WHT WIRE WHT/GRY WIRE WHT/RED WIRE YEL/RED WIRE YEL/WHT WIRE