Buick LaCrosse II (2009-2013) (bottom of "a" pillar) Wiring diagrams

2 1 LR DOOR AJAR SW SIG NETWORK BUS 4 2 1 RR DOOR AJAR SW SIG NETWORK BUS 4 AJAR SW SIG BLK WIRE BRN WIRE COMPUTER DATA LINES SYSTEM DRIVER DOOR ACCENT LAMP DRIVER DOOR HANDLE ACCENT LAMP DRIVER DOOR LATCH ASSEMBLY GRN/GRY WIRE GRN/YEL WIRE GRY WIRE LEFT CENTER CONSOLE CUPHOLDER ACCENT LAMP LEFT INSTRUMENT PANEL ACCENT LAMP LEFT REAR DOOR ACCENT LAMP LEFT REAR DOOR HANDLE ACCENT LAMP LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH NCA WIRE NETWORK BUS 3 PASSENGER DOOR HANDLE ACCENT LAMP PASSENGER DOOR ACCENT LAMP PASSENGER DOOR LATCH ASSEMBLY RED WIRE RIGHT CENTER CONSOLE CUPHOLDER ACCENT LAMP RIGHT INSTRUMENT PANEL ACCENT LAMP RIGHT LEFT CENTER CENTER CONSOLE ARMREST ACCENT LAMP CONSOLE ARMREST ACCENT LAMP RIGHT LOWER INSTRUMENT PANEL ACCENT LAMP RIGHT REAR DOOR ACCENT LAMP RIGHT REAR DOOR HANDLE ACCENT LAMP RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH WHT WIRE WHT/YEL WIRE YEL/ WHT 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

AUTO BLK WIRE BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM DIMMER SWITCH DK BLU WIRE DK BLU/BLK WIRE DK BLU/VIO WIRE FOG LAMP SWITCH FRONT FOG LAMP IND GRN WIRE GRY WIRE GRY/RED WIRE HEAD PARK HEADLAMP SWITCH HIGH BEAM LAMP IND INSTRUMENT PANEL CLUSTER LEFT FRONT FOG LAMP LOGIC LOW SPD GMLAN SER DATA LT BLU WIRE LT GRN WIRE OFF PARK BRAKE CONTROL SWITCH PARK BRK RELEASE SW SIG PARK BRK SW SIG PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) RIGHT FRONT FOG LAMP VOL REF PARK BRK SPLY VOLT WHT WIRE YEL WIRE YEL/RED 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

1 2 3 4 5 6 7 8 DIMMING SIG LOW REF SW SIG B+ BLK WIRE COMPUTER DATA LINES SYSTEM FUSE GRN WIRE GROUND SER DATA GRY WIRE HEAD-UP DISPLAY HEAD-UP DISPLAY SWITCH HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) PAGE RED/DK BLU WIRE YEL WIRE

2.4L 25 26 25 26 27 70 36 9 26 41 FUEL LVL LOW REF FUEL LVL SERIAL DATA 3.0L, 3.6L 419 893 185 ENGINE CONTROLS SYSTEM 6 12 DN ABS IND. AIR BAG IND AMBIENT AIR TEMPERATURE SENSOR (LEFT FRONT OF VEHICLE ON BUMPER FASCIA) AWD DK BATT POS VOLT IGNITION 1 VOLTAGE BLK WIRE BLK/DK BLU WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU WIRE BRAKE IND BRAKE WEAR IND BRN/WHT WIRE CHARGING IND CHECK ENGINE INDI CTRL DIC SELECT MENU SW SIG LOW WASHER FLUID IND CTRL COMPUTER DATA LINES SYSTEM CRUISE IND DK BLU WIRE DK BLU/GRY WIRE DK BLU/LT GRN WIRE DK BLU/WHT WIRE DRIVER INFORMATION CENTER (DIC) DISPLAY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) 3.0L 3.6L 2.4L ENGINE CONTROLS SYSTEM ENGINE COOLANT TEMPERATURE GAUGE ENGINE COOLANT TEMPERATURE IND ENGINE OIL PRESSURE SWITCH (FRONT OF ENGINE) ENGINE OIL PRESSURE SWITCH (LOWER FRONT ESC OFF IND FOG LAMPS IND FUEL GAUGE FUEL PUMP, LEVEL SENDER ASSEMBLY (IN FUEL TANK) FUSE FUSE FUSE GRN WIRE GROUND GRY WIRE HIGH BEAM IND HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) HOT W/ IGNITION MAIN RELAY ENERGIZED ILLUMINATION INSTRUMENT CLUSTER LEFT TURN IND LOGIC LOW FUEL WARNING LAMP IND LOW REF (OR 2755) LOW SPD GMLAN SER DATA LOW TIRE PRESSURE IND LOW WASHER FLUID IND LT GRN WIRE MALFUNCTION IND MENU OF ENGINE) OIL LEVEL IND OIL PRESS SW OUTSIDE AMBIENT AIR TEMP SENS SIG LOW REF DIC SWITCH LOW REF DIC SWITCH SIGNAL PARK IND PARK LAMPS IND RED WIRE RED/BLK WIRE RED/WHT WIRE RIGHT TURN IND SEAT BELT IND SECONDARY FUEL LEVEL SENSOR (TOP OF FUEL TANK) SECURITY IND SET/CLR SPEEDOMETER TACHOMETER TCS OFF IND TCS/ECS IND TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/GRY WIRE VIO/YEL WIRE WHT WIRE WIPER/WASHER SYSTEM YEL/DK BLU WIRE

1 2 3 4 IGN GND NETWORK BUS 2 1 2 NETWORK BUS 4 RR DOOR AJAR SW SIG 2 1 LR DOOR AJAR SW SIG NETWORK BUS 4 6 NETWORK BUS 3 RF DOOR AJAR SW SIG 6 4 LF DOOR AJAR SW SIG NETWORK BUS 4 9 5 NETWORK BUS 2 BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE FLUID LEVEL SWITCH (ON BRAKE FLUID RESERVOIR) BRN WIRE COMPASS MODULE (W/O ON STAR) COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEM 5986 333 DK BLU WIRE DK BLU/BLK WIRE DK BLU/VIO WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER WINDOW MOTOR (DRIVER'S DOOR) ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) GRN/BLU WIRE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/RED WIRE GRY/VIO WIRE LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LIFT GATE AJAR SW SIG 1 GMLAN DATA BUS LOGIC LT BLU WIRE LT GRN/GRY WIRE NETWORK BUS 2 PARK BRAKE CONTROL SWITCH PARK BRK RELEASE SW SIG PARK BRK SW SIG PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) PASSENGER DOOR LATCH ASSEMBLY PASSENGER WINDOW MOTOR POWER DISTRIBUTION SYSTEM PRESS BRAKE REAR COMPARTMENT LID LATCH (IN TRUNK LID) RED/WHT WIRE RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH RLY COIL CTRL RUN RLY COIL SERIAL DATA BRK FLUID LVL SERIAL DATA RLY COIL CTRL TRANSMISSION SHIFT LEVER POSITION INDICATOR VIO/GRY WIRE VIO/YEL WIRE VOL REF PARK BRK SPLY VOLT WHT WIRE WHT/DK BLU WIRE YEL WIRE YEL/RED WIRE

22 1 SERIAL DATA BATT POS VOLT AIR BAG COIL AUTO BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DIMMER SWITCH DOME/ READING LAMPS FOG LAMP SWITCH FRONT DOME/ READING LAMPS FUSE GARAGE DOOR OPENER GRN WIRE HDLP SW PARK LP SIG HEAD HEADLAMP SWITCH HEADUP DISPLAY SWITCH (IF EQUIPPED) HORN SWITCH HOT AT ALL TIMES IGNITION MODE SWITCH INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) INSTRUMENT PANEL MULTI-FUNCTION SWITCH 1 INSTRUMENT PANEL MULTI-FUNCTION SWITCH 2 LED BACK LEFT STEERING WHEEL CONTROLS SWITCH LIGHT CTRL SW REF LIGHT CTRL SW SIG LIGHT DIMMING CONTROL LT GRN WIRE OFF OUTSIDE REARVIEW MIRROR SWITCH PARK PARK BRAKE CONTROL SWITCH (ON PARK BRAKE ASSEMBLY) PASSENGER WINDOW SWITCH PNK WIRE RED/WHT WIRE RIGHT STEERING WHEEL CONTROLS SWITCH SERIAL DATA LOGIC STEERING WHEEL) SUNROOF SUNSHADE SWITCH SUNROOF SWITCH WHT WIRE YEL WIRE

1 2 3 DISPLAY SIG (-) DISPLAY SIG (+) DRAIN WIRE 16 1 B+ SERIAL DATA 19 20 DISPLAY TOUCH - LF SPD SENS SIG 2 1 8 LOW REF VOICE SIGNAL DRAIN WIRE 44 28 B+ SERIAL DATA 5149 5152 1792 (UYS) (UYS) (UYS) 6 12 5 VOICE SIGNAL LOW REF DRAIN WIRE 6 16 AUDIO SIGNAL LOW REF 6 20 VOICE SIGNAL LOW REF 8 9 10 14 DRAIN WIRE NAV DISPLAY + RESET DIMMING CTRL ANTI-LOCK BRAKES SYSTEM BAT POS VOLT BLK WIRE BLK/GRY WIRE BLK/YEL WIRE BRN WIRE BRN/DK GRN WIRE CELLULAR PHONE NAVIGATION, DIGITAL RADIO ANTENNA COAX COMPUTER DATA LINES SYSTEM DIMMING CTRL DISPLAY SIG + DK BLU WIRE DRAIN WIRE FUSE FUSE FUSE GRN WIRE GROUND GRY WIRE GRY/YEL WIRE HOT AT ALL TIMES INFO DISPLAY MODULE (W/ NAVIGATION) INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LOGIC LT GRN/YEL WIRE NAV TOUCH + NAVIGATION ANTENNA NAVIGATION ANTENNA SIGNAL SPLITTER NCA WIRE RADIO RADIO ANTENNA RADIO ANTENNA MODULE (BEHIND "C" PILLAR TRIM) RED WIRE RED/BLK WIRE RED/DK BLU WIRE RED/VIO WIRE REMOTE ENABLE RESET+ SOUND SYSTEMS TELEMATICS COMMUNICATIONS INTERFACE CONTROL MODULE VIO WIRE W/ DIGITAL AUDIO SYSTEM W/ UYS W/O DIGITAL AUDIO SYSTEM W/O UYS YEL WIRE