Buick LaCrosse II facelift (2013-2016) wht/brn Wiring diagrams

1 2 3 4 5 6 7 INTERIOR LAMP CONTROL BACKUP LAMP SPLY VOLT INADVERTENT POWER CTRL 1969 28 HEADLIGHTS SYSTEM HORNS SYSTEM 2500 2501 COMPUTER DATA LINES SYSTEM 3268 156 ANTI-THEFT SYSTEMS 5077 7541 STARTING/CHARGING SYSTEM EXTERIOR LIGHTS SYSTEM 544 860 HEADLIGHTS SYSTEM WIPER/WASHER SYSTEM 5797 6132 TRUNK, TAILGATE, FUEL DOORS SYSTEM COMPUTER DATA LINES SYSTEM 5911 3271 2150 294 1303 DOOR LOCKS, ANTI-THEFT SYSTEMS 5996 6817 EXTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM 6133 6134 COMPUTER DATA LINES SYSTEM 7553 737 SHIFT INTERLOCK SYSTEM INTERIOR LIGHTS SYSTEM ANTI-THEFT SYSTEM BATTERY BATTERY CURRENT SENSOR (IN FRONT OF BATTERY) BLK WIRE BLK/VIO WIRE BLU WIRE BLU/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/GRY WIRE BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE CHILD SECURITY LCK MTR COURTESY LAMP SW SIG CHILD SECURITY LCK MTR SHIFT POSITION SIG CHILD SECURITY LOCK RLY CTRL DK BLU/WHT WIRE DOOR LOCKS, ANTI-THEFT SYSTEMS DOOR LOCKS, ANTI-THEFT SYSTEMS 3269 5905 DRL RLY CTRL WINDSHIELD WIPER SW HI SIG FOG LAMP RELAY CONTROL LIFT GLASS/TRUNK RELEASE CTRL CRUISE/ETC/TCC BRAKE SIGNAL GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/BRN WIRE GRY/GRN WIRE GRY/LT GRN WIRE GRY/YEL WIRE HEADLAMP HIGH BEAM RLY CTRL HORN RLY CTRL HEADLAMP LOW BEAM RLY CTRL HEADLIGHTS SYSTEM HI SPEED GMLAN DATA BUS (+) HI SPEED GMLAN DATA BUS (-) HOT AT ALL TIMES IGNITION SWITCH INTERCONNECT NETWORK BUS 2 INTERCONNECT NETWORK BUS 3 INTERIOR LIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM INTERIOR LIGHTS SYSTEM KEY-IN IGNITION SWITCH LED AMBIENT LIGHTING CTRL 1 LOW REFERENCE STOP LAMP SPLY VOLT OFF RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RR CLOSURE HANDLE SW OPEN SIG INTERCONNECT NETWORK BUS 1 RUN WIRE SHIFT INTERLOCK SYSTEM SOLENOID CTRL TRUNK LAMP CONTROL STARTING/CHARGING SYSTEM STARTING/CHARGING SYSTEM COMPUTER DATA LINES SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM VIO WIRE VIO/GRY WIRE VIO/YEL WIRE WHT WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/VIO WIRE WHT/YEL WIRE YEL WIRE YEL/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

1 2 312 712 RH HDLP LO BEAM SPLY V LH HDLP LO BEAM SPLY V 16 11 22 HDLP SW ON SIG 23 18 10 DRL RELAY CTRL HDLP HI BEAM RLY CTRL FOG LAMP RLY CTRL 23 24 HI SPD GMLAN SER DATA (-) HI SPD GMLAN SER DATA (+) AMBIENT LIGHT SENS SIG AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BLK WIRE BLU/BRN WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/VIO WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE FOG LAMP FUSE FRONT FOG LAMP FTP FUSE GRN WIRE GROUND GRY WIRE GRY/BLU WIRE HDLP DIMMER SW HI BEAM SIG HDLP OFF SIG CTRL HDLP SW PARK LP SIG HDLP SW FLASH TO PASS SIG HEADLAMP HIGH BEAM RELAY HEADLAMP LOW BEAM RELAY HI BEAM HI BEAM RT HID HVAC CONTROL MODULE LEFT DAYTIME RUNNING LAMP, LEFT HEADLAMP ASSEMBLY LEFT HIGH BEAM SOLENOID ACTUATOR LEFT LOW BEAM HEADLAMP LH FUSE RH FUSE FUSE LIGHTING CTRL SW REF LIGHTING CTRL SW SIG LOW REF LT HID RED WIRE RED/BLK WIRE RELAY RIGHT HEADLAMP ASSEMBLY RIGHT HIGH BEAM SOLENOID ACTUATOR RIGHT DAYTIME RUNNING LAMP RIGHT LOW BEAM HEADLAMP TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE WHT WIRE WHT/BRN WIRE WINDSHIELD WIPER MOTOR YEL WIRE

2500 2501 1134 7684 COMPUTER DATA LINES SYSTEM BATTERY FUSE BLOCK (TOP OF BATTERY) BLK WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DIMMER SWITCH DRIVER INFORMATION CENTER DISPLAY FOG LAMP SWITCH FRONT FOG LAMP IND FUSE GRN WIRE GROUND GRY WIRE GRY/RED WIRE HEAD PARK AUTO HEADLAMP SWITCH HIGH BEAM LAMP IND HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN INSTRUMENT CLUSTER LEFT FRONT FOG LAMP LOGIC LOW SPD GMLAN SER DATA LT GRN WIRE MIL IGN OFF PARK BRAKE CONTROL SWITCH PARK BRK APPLY SW SIG PARK BRK RELEASE SW SIG PARK BRK RELEASE SW VOL REF PARK BRK SW SPLY VOLT PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) RED WIRE RIGHT FRONT FOG LAMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/GRY WIRE WHT WIRE WHT/BRN WIRE YEL WIRE YEL/RED WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 GROUND 1 2 3 B+ B+ 2501 2500 COMPUTER DATA LINES SYSTEM AFL BATT FUSE AFL MTR FUSE BLK WIRE BLU WIRE BRN WIRE COMPUTER DATA LINES SYSTEM GRN/VIO WIRE GRY WIRE HEADLAMP CONTROL MODULE (LOWER LEFT SIDE OF DASH BEHIND BODY CONTROL MODULE) HI SPD GMLAN SER DATA (-) HI SPD GMLAN SER DATA (+) SER DATA COMM HOT AT ALL TIMES INT N/W BUS 6 INT N/W BUS 6 B+ B+ GND 3 1 2 4 LEFT HEADLAMP ASSEMBLY LEFT HEADLAMP BALLAST LEFT HEADLAMP HORIZONTAL MOTOR NETWORK BUS 6 ORG/ WIRE RED WIRE RED/YEL WIRE RIGHT HEADLAMP ASSEMBLY RIGHT HEADLAMP BALLAST RIGHT HEADLAMP HORIZONTAL MOTOR UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT WIRE WHT/BRN WIRE YEL WIRE

5-V REF 4 ACTUATOR CTRL CLOSE SENS LOW REF ACTUATOR CTRL OPEN AIR TEMP SENS SIG BANK 1 SENS (1) BANK 1 SENS (2) MAP SENS SIG 5-V REF 3 BANK 1 SENS 1 BANK 1 SENS 2 BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BRN WIRE BRN/RED WIRE BRN/WHT WIRE DK BLU/WHT WIRE ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) FRP SENS SIG GROUND GRY WIRE GRY/DK BLU WIRE GRY/RED WIRE GRY/WHT WIRE KNOCK SENS SIG KNOCK SENSOR (LEFT OF EXHAUST MANIFOLD) LOW REF LOW REF TP SENS SIG LOW SIG BANK 1 SENS (1) LOW SIG BANK 2 SENS (2) LT GRN/DK BLU WIRE LT GRN/WHT WIRE MANIFOLD ABSOLUTE PRESSURE SENSOR (TOP OF INTAKE MANIFOLD) MASS AIR FLOW/INTAKE AIR TEMPERATURE SENSOR (TOP OF AIR CLEANER HOUSING) PARK/NEUTRAL SIG STARTING/CHARGING SYSTEM TRANSMISSIONS SYSTEM VIO/DK BLU WIRE VIO/GRY WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/GRY WIRE WHT/YEL WIRE YEL WIRE

ACC WAKEUP SERIAL DATA BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRN WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/VIO WIRE BLU/WHT WIRE BRAKE PEDAL POSITION SENSOR (NEAR TOP OF ACCELERATOR PEDAL ASSEMBLY) BRAKE POSITION SNSR LO REF BRN/RED WIRE BRN/WHT WIRE CHARGING SYSTEM COMPUTER COMPUTER DATA LINES SYSTEM CONTROL SYSTEM COOLING CRUISE CRUISE/ETC/TCC BRAKE SIG DATA COMM ENABLE DATA LINES DK BLU WIRE DK BLU/BRN WIRE DK BLU/GRN WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE ECM (LEFT FRONT OF ENGINE COMPT) ENGINE CONTROL MODULE EVAP CANISTER VENT SOL CTRL FANS SYSTEM FLP SENS LOW REF FPP RLY CTRL FRP SNSR (5) VOLT REF FRP SNSR SIG FUEL PUMP SPLY VOLT FUEL RAIL PRESSURE SENSOR (TOP OF ENGINE ON FUEL RAIL) GRN/GRY WIRE GRN/VIO WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/DK BLU WIRE HI SIG BANK 1 SENS (1) HI SIG BANK 1 SENS (2) HI SIG BANK 2 SENS 1 HI SIG BANK 2 SENS 2 HOT AT ALL TIMES BATTERY FUSE BLOCK (TOP OF BATTERY) FUSE 5 HUMIDITY SNSR SIG IGNITION 1 VOLTAGE LO SIG BANK 1 SENS 1 LO SIG BANK 1 SENS 2 LO SIG BANK 2 SENS 1 LO SIG BANK 2 SENS 2 LO SPD C/FAN RLY CTRL LOW REF LT GRN/DK BLU WIRE NCA WIRE POWERTRAIN RLY COIL CTRL PRESS SENS SIG PWR MAIN RLY FUSED SPLY (2) PWR MAIN RLY FUSED SPLY 3 RED WIRE RED/BRN WIRE RED/VIO WIRE RELAY COIL CTRL RUN/CRNK IGN 1 VOLT SERIAL DATA SHIELD EXTENSION SHUTTER VALVE SOL CTRL SNSR LO REF SNSR SIG STARTER ENABLE RLY CTRL STARTING/ SUPPLY VOLT SYSTEM TAN WIRE THROTTLE ACTUATOR CTRL CLOSE VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/GRN WIRE WHT/RED WIRE WHT/YEL WIRE YEL WIRE YEL/DK BLU WIRE YEL/WHT WIRE

3 1 2 IGN CTRL GND ACTIVE GRILLE AIR SHUTTER ACTUATOR (LEFT SIDE OF FRONT BUMPER LOWER GRILLE) BANK 1 SENSOR 1 HEATED OXYGEN SENSOR (REAR OF ENGINE IN BANK 1 EXHAUST MANIFOLD) BANK 1 SENSOR 2 HEATED OXYGEN SENSOR (DOWNSTREAM OF CATALYTIC CONVERTER) BANK 2 SENSOR 1 HEATED OXYGEN SENSOR (REAR OF ENGINE IN BANK 2 EXHAUST MANIFOLD) BANK 2 SENSOR 2 HEATED OXYGEN SENSOR (DOWNSTREAM OF CATALYTIC CONVERTER) BDY RC IGN FUSE BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/VIO WIRE BLK/WHT WIRE BRN/WHT WIRE BRN/YEL WIRE DK BLU WIRE DK BLU/BRN WIRE DK BLU/YEL WIRE ECM COOLING FAN HIGH SPEED RELAY BATT FUSE ENGINE CONTROLS IGNITION RELAY FSCM FUSE GRY/BLK WIRE GRY/DK BLU WIRE GRY/WHT WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INJ INJ ODD EVEN FUSE FUSE LOGIC LT GRN/DK BLU WIRE LT GRN/WHT WIRE LT GRN/YEL WIRE MULTI-FUNCTION INTAKE AIR SENSOR (TOP OF AIR CLEANER HOUSING) NCA WIRE NON ECM WLK VEH FUSE FUSE NON WLK 02 FUSE POWER DISTRIBUTION SYSTEM RED WIRE RED/BRN WIRE RED/LT GRN WIRE RED/VIO WIRE SAIR PUMP FUSE SECONDARY AIR INJECTION PUMP RELAY TO SECONDARY AIR INJECTION SOLENOID VALVE RELAY (DIAGRAM 4 OF 7) TRN ECM FSC IGN CANN IGN FUSE VENT FUSE FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/RED WIRE WHT/YEL WIRE YEL WIRE YEL/DK BLU WIRE YEL/WHT WIRE

A/C COMPRESSOR CLUTCH RELAY AUXILIARY HEATER COOLANT PUMP RELAY AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP RELAY BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRY WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/WHT WIRE BRN WIRE BRN/GRN WIRE BRN/RED WIRE BRN/WHT WIRE CHARGE INDICATOR CTRL COOLING FAN LOW SPEED RELAY DK BLU WIRE DK BLU/BRN WIRE DK BLU/GRY WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE ECM (LEFT FRONT OF ENGINE COMPT) ENGINE CONTROL MODULE EVAP CANISTER PURGE SOL CTRL FAN RLY A FROM ENGINE CONTROLS IGNITION RELAY (DIAGRAM 3 OF 7) FUSE GEN FIELD DUTY CYCLE SIG GRY WIRE GRY/DK BLU WIRE GRY/RED WIRE GRY/WHT WIRE HI VOLT SPLY CYL 1 HI VOLT SPLY CYL 2 HI VOLT SPLY CYL 3 HI VOLT SPLY CYL 4 HI VOLT SPLY CYL 5 HI VOLT SPLY CYL 6 HOT AT ALL TIMES INDUCTION AIR TEMP SNSR SIG INTAKE AIR TEMP SNSR LO REF KNOCK SNSR LO REF (1) KNOCK SNSR LO REF (2) KNOCK SNSR SIG (1) KNOCK SNSR SIG (2) LO CTRL BANK 1 SNSR (1) LO CTRL BANK 1 SNSR (2) LO CTRL BANK 2 SNSR (1) LO CTRL BANK 2 SNSR (2) LT GRN/DK BLU WIRE LT GRN/GRY WIRE LT GRN/WHT WIRE LT GRN/YEL WIRE MAP SNSR LO REF MAP SNSR SIG MASS AIR FLOW SNSR SIG RED/GRN WIRE RED/LT GRN WIRE SAIR SOL FUSE SECONDARY AIR INJECTION SOLENOID VALVE RELAY SIGNAL GROUND STARTING/ CHARGING SYSTEM SW SIG THROTTLE ACTUATOR CTRL OPEN THROTTLE POSITION SNSR THROTTLE SENS LO REF TR PARK/NEUTRAL SIG (1) TRANS- MISSIONS SYSTEM VIO/DK BLU WIRE VIO/GRY WIRE WHT WIRE WHT/BRN WIRE WHT/DK BLU WIRE WHT/GRY WIRE YEL WIRE

BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRY WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/GRN WIRE BRN/WHT WIRE DK BLU WIRE DK BLU/GRY WIRE DK BLU/VIO WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE OIL LEVEL SWITCH (LOWER RIGHT FRONT SIDE OF ENGINE, MOUNTED TO OIL PAN) FUEL INJECTORS (TOP OF ENGINE) GRY/DK BLU WIRE LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/DK BLU WIRE LT GRN/GRY WIRE LT GRN/WHT WIRE NCA WIRE PPL PPL/WHT WIRE SECONDARY AIR INJECTION BANK 1 SOLENOID VALVE (LEFT OF EXHAUST PORT) SECONDARY AIR INJECTION BANK 2 SOLENOID VALVE (LEFT OF EXHAUST PORT) SPARK PLUG VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE WHT/BRN WIRE WHT/GRY WIRE WHT/LT GRN WIRE