Buick LaCrosse II facelift (2013-2016) wht/yel 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

13 14 6 15 14 5 ACCESSORY WAKEUP SERIAL DATA SER DATA (-) 1 SER DATA (+) 1 2.4L 3.6L 5 17 SER DATA (+) 1 SER DATA (-) 1 6 18 SER DATA (+) 1 SER DATA (-) 1 8 7 12 2 HS SERIAL DATA - HS SERIAL DATA + BATTERY ENERGY CONTROL MODULE BLU WIRE BLU/BLK WIRE BLU/YEL WIRE COMM ENABLE CONTROL SOLENOID VALVE ASSEMBLY AUTOMATIC TRANSMISSION ASSEMBLY DATA COM ENABLE DK BLU WIRE DK BLU/GRY WIRE DK BLU/YEL WIRE DOOR HARNESS) ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GRY WIRE HIGH SERIAL DATA HS SERIAL DATA - HYDRID/EV BATTERY PACK LOW SERIAL DATA LT GRN/BLK WIRE PNK/BLK WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) SER DATA (-) (1) SER DATA - (3) SERIAL DATA SERIAL DATA ACC WAKEUP STARTER/GENERATOR CONTROL MODULE TAN/WHT WIRE VIO/YEL WIRE W/ BELT DRIVE W/ VARIABLE EFFORT W/O BELT DRIVE W/O VARIABLE EFFORT OR BELT DRIVE WHT WIRE WHT/BLU 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 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

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

12 24 HAZ SW LEFT TURN SIG HAZ SW RIGHT TURN SIG 13 7 22 BRK APPLY SENS SPLY VOLT BRK APPLY SENS SIG LO SPD GMLAN SER DATA 26 1 HAZ SW SIG B+ BACKUP LAMPS CIRCUIT BCM 3 BCM 4 FUSE FUSE BCM 7 FUSE BLK WIRE BLK/BRN WIRE BLU WIRE BLU/RED WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE CENTER HIGH MOUNTED STOP LAMP COMPUTER DATA LINES SYSTEM FUSE 32 FUSE 52 GRN RED/ WIRE GRN WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BRN WIRE GRY/YEL WIRE HAZARD SWITCH HEAD PARK AUTO HEADLAMP SWITCH HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED INSTRUMENT PANEL MULTI-FUNCTION SWITCH 2 LEFT BACKUP LAMP LEFT LICENSE PLATE LAMP LEFT REAR SIDE MARKER LAMP LEFT REAR TURN SIGNAL LAMP LEFT TAIL LAMP ASSEMBLY LEFT TAIL/STOP LAMP LEFT TAILLAMP ASSEMBLY LOGIC OFF RED WIRE RED/BLK WIRE RED/DK GRN WIRE RED/LT GRN WIRE RED/WHT WIRE RIGHT LICENSE PLATE LAMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) USED) VIO WIRE VIO/GRY WIRE WHT WIRE WHT/YEL WIRE

1 2 3 4 B+ GND VOLT AJAR SW SIG APPROXIMATELY 150 MM FROM BREAKOUT TO WINDOW MOTOR) B+ GND BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/DK GRN WIRE BLK/GRY WIRE BLK/LT GRN WIRE BRN WIRE BRN/WHT WIRE BRN/YEL WIRE CHILD SECURITY LOCK DISABLE RELAY COMPUTER DATA LINES SYSTEM FROM BREAKOUT TO WINDOW MOTOR) FUSE 71 GRN WIRE GRN/GRY WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN WIRE HOT AT ALL TIMES IGNITION MODE SWITCH KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LOW REF (7) SIG (6) LOW REF (6) SIG (8) LOW REF (8 SIG (7) NETWORK BUS 4 PASSENGER DOOR LATCH ASSEMBLY RED/WHT WIRE RIGHT REAR DOOR LATCH ASSEMBLY SERIAL DATA SW MODE CTRL LOW REF UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/BLK WIRE VIO/YEL WIRE WHT/DK BLU WIRE WHT/LT GRN WIRE WHT/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

3 2 1 FAN SPD SIG 1 FAN SPD SIG 2 GROUND 5 4 BATT POS VOLT FAN SPD SNSR SUPPLY VOLT ACCESSORY WAKEUP AJAR SW SIG AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP BATT POS VOLT BATT RVC FUSE BATTERY ENERGY CONTROL MODULE BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BPIM BATT FUSE BPIM IGN FUSE BRN/LT GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COOLANT TEMP SNSR SIG SNSR LOW REFERENCE CURRENT SNSR LOW CURRENT SNSR SIG CURRENT SNSR SPLY DK BLU WIRE DK BLU/GRY WIRE FAN SPEED SNSR SUPPLY VOLT BATT POSITIVE VOLTAGE SERIAL DATA (+) SERIAL DATA (+) FROM HYBRID/ EV BATTERY SECTION 2 (DIAGRAM 4 OF 4) GRN WIRE GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HIGH SER DATA HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV BATTERY PACK CABLE COVER HYBRID/EV BATTERY PACK CURRENT SENSOR HYBRID/EV POWERTRAIN CONTROL MODULE STARTER/GENERATOR CONTROL MODULE LOGIC HYBRID/EV BATTERY PACK COOLING FAN LOW SER DATA LT GRN/VIO WIRE LT GRN/WHT WIRE MAIN CONTACTOR MGU CLT PMP FUSE NCA WIRE ORG/ WIRE P-P BLOWER FUSE PRE-CHARGE CONTACTOR RED WIRE RED/BLK WIRE RED/DK BLU WIRE RED/VIO WIRE RED/YEL WIRE REFERENCE RUN/CRANK IGN 1 SER DATA SERIAL DATA SERIAL DATA (+) SERIAL DATA (-) BATT POSITIVE VOLTAGE STARTER/ GENERATOR COOLANT PUMP RELAY STARTER/GENERAROR COOLANT TEMPERATURE SENSOR (RIGHT FRONT SIDE OF ENGINE COMPT) UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/WHT WIRE VIO/YEL WIRE WHT BLU/BLK WIRE WHT WIRE WHT/YEL WIRE YEL/GRN 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