Buick LaCrosse II (2009-2013) 3.6l Wiring diagrams

3.6L A/C LOW REF A/C SENS SIG AIR INLET ACTUATOR (RIGHT SIDE OF HVAC MODULE) AIR RECIRCULATION DOOR ACTUATOR BATT+ VOLT BLK WIRE BLK/BRN WIRE BLK/GRY WIRE BLK/PNK WIRE BLK/WHT WIRE BLU WIRE BLU/WHT WIRE BRN/GRN WIRE BRN/RED WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE ENG TEMP SENS SIG ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EXCEPT 3.6L GMLAN SERIAL DATA GRN WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/DK 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 LOWER LEFT AIR TEMP SENS SIG LOWER RIGHT AIR TEMP SENS SIG LT GRN WIRE LT GRN/VIO WIRE MODE DOOR ACTUATOR ORG/ WIRE ORG/BLU WIRE PPL/GRY WIRE RED/BLK 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 TEMP DR STEPPER MTR CTRL 1 VIO/BLU WIRE WHT WIRE WHT/PNK WIRE WHT/PPL WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

3.6L 3.6L EXCEPT AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLU WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK GRN WIRE ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EXCEPT 3.6L 3.6L FUSE GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES INSIDE REARVIEW MIRROR LEFT BACKUP LAMP LEFT TAIL LAMP LT GRN WIRE LT GRN/WHT WIRE PARK/NEUTRAL SIG REAR WINDOW SUNSHADE MODULE REARVIEW CAMERA RED WIRE RED/YEL WIRE RIGHT BACKUP LAMP RIGHT TAIL LAMP SIG A SIG B SIG C SIG P SUPPLY VOLT TRANS- MISSION INTERNAL MODE SWITCH TRANSMISSION CONTROL MODULE UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/YEL WIRE WAKE UP SIG WHT LT GRN/ WIRE WHT WIRE WHT/GRY WIRE YEL WIRE

1 2 3 4 5 SERIAL DATA SERIAL DATA + SERIAL DATA + SERIAL DATA - SERIAL DATA - 1 2 GND BATTERY 3.0L 2.4L 3.6L 5 6 14 DATA + DATA - SPLY VOLT ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLU/YEL WIRE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU (OR YEL/BLK) WIRE DK BLU WIRE DK GRN/BRN WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE GRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LOGIC LT GRN/BRN WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) RED/YEL WIRE SHAFT SPEED SENSOR STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SYSTEM TRANS- MISSION OUTPUT TRANSMISSION CONTROL MODULE (TCM) UNDERHOOD AUXILIARY FUSE BLOCK INTEGRAL TO FUSE BLOCK-UNDERHOOD) WHT (OR YEL) WIRE 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 3.0L 2.4L 3.6L 5 6 14 DATA + DATA - SPLY VOLT ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLK/YEL WIRE BLU/YEL WIRE BRN/GRN WIRE BRN/LT GRN WIRE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU (OR YEL/BLK) WIRE DK BLU WIRE DK GRN/BN WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE GRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LOGIC LT GRN/BRN WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) RED WIRE RED/DK BLU WIRE SERIAL DATA 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) WHT (OR YEL) WIRE WHT WIRE WHT/DK BLU WIRE

2.4L 3.6L 3.6L EXCEPT AUTOMATIC TRANSMISSION ASSEMBLY CONTROL SOLENOID VALVE ASSEMBLY BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BLU WIRE BRAKE FLUID LEVEL SWITCH DATA LINK CONNECTOR ENGINE CONTROL MODULE EXCEPT 2.4L EXCEPT 3.6L HVAC CONTROL MODULE IGNITION COIL 1 IGNITION COIL 2 IGNITION COIL 3 IGNITION COIL 4 INSTRUMENT CLUSTER LEFT FRONT STRUT TOWER) LEFT REAR DOOR COURTESY LAMP LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR DOOR LEFT REAR ACCENT DOOR HANDLE LAMP ACCENT LAMP LEFT REAR WINDOW SWITCH MASS AIR FLOW/ INTAKE AIR TEMPERATURE SENSOR MULTI-AXIS ACCELERATION SENSOR NCA WIRE OUTSIDE REARVIEW MIRROR SWITCH PASSENGER DOOR LATCH ASSEMBLY PASSENGER DOOR PASSENGER HANDLE DOOR ACCENT ACCENT LAMP LAMP PASSENGER SEATBACK AUDIO VIDEO DISPLAY AMPLIFIER PASSENGER WINDOW SWITCH RIGHT REAR DOOR HANDLE ACCENT LAMP RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR RIGHT REAR DOOR DOOR COURTESY ACCENT LAMP LAMP STARTER STEERING WHEEL ANGLE SENSOR SWITCH) IGNITION MODE SWITCH TELEMATICS COMMUNICATION DRIVE INTERFACE SEATBACK CONTROL MODULE VIDEO DISPLAY TO WINDSHIELD WIPER MOTOR CONNECTOR) TRANSMISSION SHIFT LEVER POSITION INDICATOR TURN SIGNAL/ HEADLAMP MULTI-FUNCTION SWITCH SWITCH W/ AMPLIFIER W/ ONSTAR, W/O ONSTAR AMPLIFIER W/ AMPLIFIER W/ W/O ONSTAR, ONSTAR AMPLIFIER W/ KEYLESS ENGINE W/ MEMORY W/ ONSTAR W/ ONSTAR W/O AMPLIFIER W/ W/ ONSTAR ONSTAR, W/O AMPLIFIER AMPLIFIER W/O MEMORY WHT/ BLK WIRE WINDSHIELD WIPER WINDSHIELD WIPER MOTOR WIPER WIPER RELAY RELAY DIODE 1 DIODE 2

3 OF 5) FUSE 3.0L, 3.6L 2.4L 3.6L 5 OF 5) AIR QUALITY SENSOR (IF EQUIPPED) BLK WIRE BODY CONTROL MODULE BRN WIRE CONTROL SOLENOID VALVE ASSEMBLY COOLING FAN LOW SPEED RELAY DK BLU WIRE ENGINE CONTROLS IGNITION RELAY ENGINE HVAC CONTROL CONTROL MODULE MODULE FROM BATTERY FUSE BLOCK (DIAGRAM 1 OF 5) FROM ENGINE CONTROL MODULE RELAY (DIAGRAM 2 OF 5) FRONT FOG LAMP RELAY FUEL PUMP CONTROL MODULE FUSE FUSE (DIAGRAM FUSE FUSE FUSE FUSE FUSE GRY WIRE HEADLAMP HIGH BEAM RELAY HORN RELAY IGNITION MAIN RELAY INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE INFO MULTIMEDIA DISPLAY PLAYER MODULE INTERFACE MODULE INSIDE REARVIEW MIRROR INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LT GRN/VIO WIRE MASS AIR FLOW SENSOR/INTAKE AIR TEMPERATURE SENSOR RADIO/ HVAC CONTROLS (IF EQUIPPED) REARVIEW CAMERA RED WIRE RED/BLK WIRE RED/BRN WIRE RED/DK BLU WIRE RED/DK GRN WIRE RED/VIO WIRE RED/WHT WIRE SECONDARY COOLING FAN AIR RIGHT INJECTION HIGH SPEED PUMP RELAY RELAY TO BODY CONTROL MODULE (DIAGRAM 5 OF 5) TO IGNITION DATA LINK SWITCH CONNECTOR (DIAGRAM 5 OF 5) TO WINDSHIELD WASHER PUMP RELAY (DIAGRAM 2 OF 5) UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/BLK WIRE VIO/GRY WIRE VIO/LT GRN WIRE VIO/WHT WIRE W/ AUDIO INTERFACE W/ REAR VIEW CAMERA W/ SIDE OBSTACLE DETECTION, SENSOR INDICATOR (NOT USED) W/O REAR VIEW CAMERA WHT WIRE WINDSHIELD WINDSHIELD WIPER WASHER RELAY PUMP RELAY WINDSHIELD WIPER SPEED CONTROL RELAY YEL WIRE