Buick LaCrosse II (2009-2013) hvac control module Wiring diagrams

A/C COMPRESSOR SOLENOID VALVE AIR QUALITY SENSOR (BELOW AIR INLET GRILL PANEL) BLK WIRE BLK/DK BLU WIRE BLOWER MTR SPD CTRL BRN/VIO WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM COOLING FAN LOW SPEED RELAY DEFOGGER SYSTEM DK BLU WIRE DK BLU/LT GRN WIRE FUSE GRN WIRE GRN/YEL WIRE GRY WIRE GRY/DK BLU WIRE GRY/LT GRN WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED HUMIDITY SENS SIG TWILIGHT SENTINEL DELAY SIG HVAC CONTROL MODULE INSIDE AIR TEMP SENS LOW REF REAR DEFOG RLY CTRL LEFT COOLING FAN HIGH SPEED RELAY LINEAR INTERCONNECT NETWORK BUS 9 LOGIC LT GRN DK BLU/ WIRE LT GRN/VIO WIRE RED/VIO WIRE RED/WHT WIRE RIGHT COOLING FAN HIGH SPEED RELAY SOLAR SENS DRV SIG TEMP SENS LOW REF UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/BLK WIRE VIO/GRY WIRE VIO/WHT WIRE WHT WIRE WHT/DK BLU WIRE YEL WIRE YEL/DK BLU WIRE YEL/RED WIRE

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

A/C COMPRESSOR SOLENOID VALVE A/C LOW REF A/C REFRIGERANT PRESSURE SENSOR (FRONT OF ENGINE COMPT, MOUNTED TO CONDENSER) A/C SENS SIG BATT+ VOLT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DATA DK BLU WIRE DK BLU/LT GRN WIRE ELECTRIC CTRL ELECTRIC SPLY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EXCEPT 3.6L 3.6L FUSE GRN WIRE HOT AT ALL TIMES HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) HOT W/ IGNITION MAIN RELAY ENERGIZED HVAC CONTROL MODULE IGN 1 VOLT LT GRN WIRE RED/BRN WIRE RED/WHT WIRE SERIAL DATA SIG GND UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/GRY WIRE WHT WIRE

4 2 7531 5060 NETWORK BUS 9 LO SPD GMLAN SERIAL DATA ACTUATOR TRANSMIT SIG BREAKOUT TO INLINE TO DRIVER SEAT HARNESS) GRN WIRE GRN/BLU WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/GRN WIRE GRY/RED WIRE HEAD-UP DISPLAY (IF EQUIPPED) HVAC CONTROL MODULE INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (BELOW CENTER CONSOLE) INFO DISPLAY MODULE INSTRUMENT CLUSTER KEYLESS ENTRY CONTROL MODULE LEFT SIDE OBJECT SENSOR (IF EQUIPPED) (BEHIND LEFT REAR WHEEL) LO SPD GMLAN SERIAL DATA LT GRN/WHT WIRE MULTIMEDIA PLAYER INTERFACE MODULE (W/ AUDIO INTERFACE) NCA WIRE NETWORK BUS 8 OUTSIDE REAR VIEW MIRROR SWITCH PASSENGER PRESENCE DETECTION MODULE (UNDER FRONT PASSENGER'S SEAT) PASSENGER WINDOW SWITCH PPL RADIO RADIO/HVAC CONTROLS REAR PARKING ASSIST CONTROL MODULE (W/ REAR PARKING ASSIST SENSOR INDICATOR) RIGHT SIDE OBJECT SENSOR (BEHIND RIGHT REAR WHEEL) SEAT HEATING CONTROL MODULE (UNDER FRONT CENTER OF DRIVER SEAT) SEAT MEMORY CONTROL MODULE (UNDER DRIVER'S SEAT) SPLICE PACK TELEMATICS COMMUNICATIONS INTERFACE CONTROL MODULE VIO WIRE W/ MEMORY W/ NAVIGATION W/O MEMORY W/O NAVIGATION YEL WIRE

BATTERY FUSE BLOCK BLK WIRE BRN WIRE BRN/VIO WIRE BRN/YEL WIRE DRIVER OUTSIDE REARVIEW MIRROR FUSE FUSE (TOP OF BATTERY) HOT AT ALL TIMES HVAC CONTROL MODULE LEFT REAR WINDOW DEFOGGER NOISE FILTER PASSENGER OUTSIDE REARVIEW MIRROR REAR DEFOGGER GRID REAR DEFOGGER IND REAR DEFOGGER RELAY REAR DEFOGGER RLY CTRL REAR DEFOGGER SWITCH LOGIC RED WIRE RIGHT REAR WINDOW DEFOGGER NOISE FILTER UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE YEL BRN/ WIRE

18 12 RR STATUS SIG LR STATUS SIG 25 27 16 RCDLR POWER RCDLR DATA TRANSMIT RCDLR GROUND 3 4 19 15 POS VOLT POS VOLT LOCK SIG UNLOCK SIG 4 1 UNLOCK CTRL LOCK CTRL 2 4 6 NETWORK BUS 3 AJAR SW SIG AJAR SW SIG 1 AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE BRN/LT GRN WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/VIO WIRE DK BLU/WHT WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH FUSE GRN WIRE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/LT GRN WIRE GRY/WHT WIRE HOOD AJAR SW SIG HOOD AJAR SWITCH (FRONT OF ENGINE COMPT) HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) FUSE INSTRUMENT PANEL MULTI-FUNCTION SWITCH 1 LOCK CTRL 2 LOCK RELAY CTRL NETWORK BUS 3 NETWORK BUS 4 PASSENGER DOOR LATCH ASSEMBLY PPL RCDLR DATA RECEIVE RED WIRE RED/VIO WIRE SECURITY IND CTRL STATUS CTRL UNLOCK SIG VIO/GRY WIRE VIO/YEL WIRE WHT/VIO WIRE YEL WIRE YEL/LT GRN WIRE

ACCESSORY VOLTAGE AJAR SW SIG AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BATT POS VOLT BLK WIRE BODY CONTROL MODULE (BCM) (LEFT SIDE OF DASH) BRN WIRE BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DR LK CTRL DRV DR LK SW LK SIG DRV DR LK SW UNLK SIG DRV DR LK UNLK CTRL FUSE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE HDLP HI BEAM RLY CTRL HEADLIGHTS SYSTEM HOOD AJAR SW SIG HOOD AJAR SWITCH (FRONT OF ENGINE COMPT) HORN RLY CTRL HORNS SYSTEM HOT AT ALL TIMES HVAC CONTROL MODULE INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) INSTRUMENT PANEL MULTI-FUNCTION SWITCH 1 LK MTR STATUS SIG LR LK MTR STATUS SIG RR NETWORK BUS 4 POS VOLT PPL RED/WHT WIRE RIGHT REAR WINDOW SWITCH RUN/CRANK IGN 1 VOLT SECURITY IND CTRL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/YEL WIRE WHT WIRE YEL WIRE YEL/BLK 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

1 2 33 32 RF DRL SPLY VOLT LF DRL SPLY VOLT 2 3 2540 2140 B+ B+ 22 10 5060 278 LOW SPD GMLAN SER DATA AMBIENT LIGHT SENS SIG 22 11 16 13 306 103 HDLP SW PARK LP SIG ADAPTIVE FRONT LIGHTING CIRCUIT AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DK BLU WIRE DK BLU/BRN WIRE FRONT FOG LAMP FUSE FUSE FUSE GRN WIRE GRY WIRE GRY/DK 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 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) LEFT DAYTIME RUNNING LAMP (BOTTOM OF "A" PILLAR) LEFT HEADLAMP LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LIGHTING CTRL SW REF LIGHTING CTRL SW SIG LOW REF LT GRN WIRE NCA WIRE RED WIRE RED/BLK WIRE RELAY RIGHT DAYTIME RUNNING LAMP RIGHT HEADLAMP RIGHT HEADLAMP BALLAST RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT LOW BEAM HEADLAMP TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE WHT WIRE YEL WIRE

1 2 RT HDLP LW BEAM SPLY VOLT LT HDLP LW BEAM SPLY VOLT 17 11 HDLP SW FLASH TO PASS SIG HDLP DIMMER SW HI BEAM SIG 18 10 HDLP HI BEAM RLY CTRL 2 3 B+ B+ 22 11 16 HDLP SW PARK LP SIG AMBIENT LIGHT SENS SIG AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) AUTO OFF BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEM (FRONT OF AIR FILTER) CRUISE CONTROL, SOUND SYSTEMS DIMMER SWITCH FOG LAMP RLY CTRL FOG LAMP SWITCH FRONT FOG LAMP IND FRONT FOG LAMP RELAY FUSE GRN WIRE HDLP OFF SIG CTRL HDLP SW ON SIG HEAD HEADLAMP HIGH BEAM RELAY HEADLAMP SWITCH HIGH BEAM LAMP IND 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) LEFT FRONT FOG LAMP LEFT HEADLAMP LEFT HIGH BEAM HEADLAMP LEFT LOW BEAM HEADLAMP LIGHTING CTRL SW REF LIGHTING CTRL SW SIG LOGIC INSTRUMENT PANEL CLUSTER LOW REF LOW SPD GMLAN SER DATA LT GRN WIRE PARK AUTO OFF HEAD PARK RED WIRE RED/BLK WIRE RIGHT FRONT FOG LAMP RIGHT HEADLAMP RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT WIRE YEL WIRE