Buick LaCrosse II facelift (2013-2016) grn/gry Wiring diagrams

3 4 BATT POS VOLT BATT POS VOLT 4 17 5 BATT POS VOLT IND DIM CTRL HAZ LED 7 13 TRUNK LP CTRL INADVERTENT PWR CTRL BCM 7 BCM 2 FUSE BLOCK FUSE FUSE (LOWER LEFT SIDE OF DASH) BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) CENTER CONSOLE COMPARTMENT LAMP CENTER CONSOLE COMPARTMENT LAMP SWITCH COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DIM SIG LED AMBIENT LIGHTING CTRL DIMMER SWITCH DRIVER DOOR COURTESY FOG LAMP SWITCH FUSE 32 GRN/GRY WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/GRN WIRE GRY/LT GRN WIRE HEADLAMP SWITCH HOT AT ALL TIMES INSTRUMENT PANEL INSTRUMENT PANEL COMPARTMENT LAMP INTR LP CTRL INTR LP DEFEAT SW SIG COURTESY LP SW SIG PUDDLE LAMP SUPLY VOLT 19 8 LAMP LEFT REAR DOOR COURTESY LEFT SUNSHADE LEFT SUNSHADE MIRROR LAMP LEFT TAILLAMP ASSEMBLY LIFT GATE AJAR SW SIG LIGHTING CTRL SW SIG LIGHTING CTRL SW REF LT GRN/GRY WIRE LT GRN/YEL WIRE NCA WIRE NETWORK BUS 3 NETWORK BUS 4 PASSENGER DOOR COURTESY REAR COMPARTMENT COURTESY LAMP REAR COMPARTMENT LID LATCH (IN TRUNK LID) RED/BRN WIRE RED/DK GRN WIRE RED/WHT WIRE RIGHT REAR DOOR COURTESY RIGHT SUNSHADE RIGHT SUNSHADE MIRROR LAMP UNDER HOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/BRN WIRE VIO/GRY WIRE W/ CUSTOM INTERIOR PACKAGE LAMP WHT WIRE WHT/BRN WIRE WHT/YEL WIRE YEL WIRE

1 2 NETWORK BUS 4 RR DOOR AJAR SW SIG 2 1 LR DOOR AJAR SW SIG NETWORK BUS 2500 2501 1492 7684 COMPUTER DATA LINES SYSTEM 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 BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE FLUID LEVEL SWITCH (ON BRAKE FLUID RESERVOIR) BRN WIRE COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEM 5986 333 DRIVER DOOR LATCH ASSEMBLY DRIVER WINDOW MOTOR (DRIVER'S DOOR) ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) GRN WIRE 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 LOGIC 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 (FRONT PASSENGER'S DOOR) 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 SERIAL DATA BRK FLUID LVL TRANSMISSION SHIFT LEVER POSITION INDICATOR VIO WIRE VIO/GRY WIRE VOL REF PARK BRK SW SIG WHT WIRE WHT/BLU WIRE YEL WIRE YEL/RED WIRE

BLK WIRE BLK/BLU WIRE BLU/GRN WIRE BLU/VIO WIRE BRN WIRE BRN/VIO WIRE BRN/WHT WIRE DOWN DOWN FWD DRIVER SEAT ADJUSTER SWITCH DRIVER SEAT LUMBAR SUPPORT PUMP DRIVER SEAT MEMORY SWITCH GRN WIRE GRN/BRN WIRE GRN/GRY WIRE GRY/BLK WIRE GRY/GRN WIRE MEM MEM SEAT SW SET SIG MEM SW LOW REF MEM SEAT SW SIG (1) RED/YEL WIRE RIGHT REAR HAPTIC SEAT MTR CTRL LEFT REAR HAPTIC SEAT MTR CTRL RWD RWD UP USED) VERTICAL MTR POS SNSR SIG RECLINE MTR POS SNSR SIG VIO WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/BLU WIRE YEL/BRN WIRE YEL/WHT WIRE

18 12 RR STATUS SIG LR STATUS SIG 2 18 LOCK CTRL (2) HEADLAMP HI 4 1 UNLOCK CTRL LOCK CTRL 2 4 19 15 POS VOLT LOCK SIG UNLOCK SIG 4 6 NETWORK BUS 3 AJAR SW SIG AJAR SW SIG 1 AMBIENT LIGHT/ SUNLOAD SENSOR (CENTER OF DASH) BCM 8 SIDE OF DASH) FUSE BLK WIRE BM RLY CTRL 25 27 16 RCDLR POWER RCDLR DATA TRANSMIT RCDLR GROUND BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/VIO WIRE DK BLU/WHT WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER DOOR LOCK SWITCH DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH GRN WIRE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN WIRE GRY/WHT WIRE HEADLIGHTS SYSTEM HOOD AJAR SW SIG HOOD AJAR SWITCH (FRONT OF ENGINE COMPT) HORN RLY HORNS SYSTEM HOT AT ALL TIMES HVAC CONTROL MODULE HYBRID POWERTRAIN CONTROL MODULE HYBRID/EV BATTERY PACK (HYBRID) (RIGHT SIDE OF LUGGAGE COMPT) INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT LOCK RELAY CTRL NETWORK BUS 3 NETWORK BUS 4 PASSENGER DOOR LATCH ASSEMBLY PASSENGER DOOR LOCK SWITCH PPL RCDLR DATA RECEIVE RED/VIO WIRE SECURITY IND CTRL STARTER/GENERATOR CONTROL MODULE STATUS CTRL UNLOCK SIG VIO/GRY WIRE VIO/YEL WIRE WHT/VIO WIRE YEL WIRE YEL/LT GRN 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

ACCESSORY VOLTAGE AJAR SW SIG AMBIENT LIGHT/ SUNLOAD HVAC SENSOR CONTROL (CENTER MODULE OF DASH) BATT POS VOLT BCM 3 FUSE BCM 6 FUSE BLK WIRE BODY CONTROL MODULE (BCM) (LEFT SIDE OF DASH) BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER DOOR LOCK SWITCH DRV DR LK SW LK SIG DRV DR LK SW UNLK SIG DRV DR LK UNLK CTRL GRN WIRE GRN/GRY WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN 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 HYBRID POWERTRAIN CONTROL MODULE STARTER/GENERATOR CONTROL MODULE HYBRID/EV BATTERY PACK (HYBRID) (RIGHT SIDE OF LUGGAGE COMPT) INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LK MTR STATUS SIG LR LK MTR STATUS SIG RR LOCK CTRL LOCK CTRL 2 LOCK RELAY CTRL LT GRN/YEL WIRE NETWORK BUS 4 PASS DR UN LK LTCH CTRL PASSENGER DOOR LOCK SWITCH POS VOLT PPL RCDLR DATA GND RCDLR DATA RECEIVE RCDLR DATA TRANSMIT RCDLR POWER 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/GRY WIRE VIO/YEL WIRE YEL WIRE

A/C COMPRESSOR CLUTCH RELAY ACTIVE GRILLE AIR SHUTTER ACTUATOR (LEFT SIDE OF FRONT BUMPER LOWER GRILLE) AUXILIARY HEATER COOLANT PUMP RELAY AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP RELAY BLK WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/YEL WIRE BLU WIRE BLU/BRN WIRE BLU/WHT WIRE BLU/YEL WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CANN VENT FUSE CHASSIS CONTROL MODULE (REAR COMPT, RIGHT REAR CORNER, BEHIND TRIM PANEL) COMMUNICATION ENABLE COMPUTER DATA LINES SYSTEM COOLING FAN HIGH SPEED RELAY DK BLU WIRE DK BLU/BRN WIRE ECM BATT FUSE ECM IGN FUSE FLP SENS FPP RLY CTRL FROM ENGINE CONTROL IGNITION RELAY (DIAGRAM 4 OF 5) FSCM FUSE FUEL PRESSURE SENSOR (IN FUEL TANK) GMLAN SERIAL DATA DRIVER INFORMATION CENTER (DIC) DISPLAY GRN WIRE GRN/GRY WIRE GROUND GRY WIRE GRY/BLK WIRE GRY/DK BLU WIRE HOT AT ALL TIMES HOT W/ IGNITION MAIN RELAY ENERGIZED IGN IGN 1 VOLT IGN OIL PRESSURE IND MIL IND INSTRUMENT CLUSTER LOGIC LOGIC LOW REF LT GRN/DK BLU WIRE NCA WIRE PRESS SENS SIG RED/BRN WIRE RED/LT GRN WIRE RED/VIO WIRE RUN/CRANK SAIR PUMP FUSE SAIR SOL FUSE SECONDARY AIR INJECTION PUMP RELAY SECONDARY AIR INJECTION SOLENOID VALVE RELAY SERIAL DATA SHIELD EXTENSION SHUTTER VALVE SOL CTRL SPLY VOLT FUEL PUMP TRN BDY FSC RC IGN IGN FUSE FUSE VIO/BLK WIRE VIO/DK BLU WIRE VIO/GRY WIRE VIO/LT GRN WIRE WHT WIRE WHT/BLU WIRE YEL WIRE

5-VOLT REF 1 BLK/BRN WIRE BLK/GRY WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLING FAN LOW SPEED RELAY DK BLU WIRE DK BLU/GRY WIRE DK BLU/WHT WIRE DK GRN WIRE ENGINE CONTROL IGNITION RELAY ENGINE CONTROL MODULE (LEFT FRONT EXHAUST SOLENOID (1) FAN RLY A INJ ODD FUSE FUSE FUEL INJECTOR 1 FUEL INJECTOR 1 CTRL FUEL INJECTOR 1 CYND FUEL INJECTOR 2 FUEL INJECTOR 2 CTRL FUEL INJECTOR 2 CYND FUEL INJECTOR 3 FUEL INJECTOR 3 CTRL FUEL INJECTOR 3 CYND FUEL INJECTOR 4 FUEL INJECTOR 4 CTRL FUEL INJECTOR 4 CYND GRN/GRY WIRE GRY/BLU WIRE GRY/DK BLU WIRE GRY/YEL WIRE HOT AT ALL TIMES BATTERY FUSE BLOCK (TOP OF BATTERY) FUSE INTAKE SOLENOID (1) LOW REF LT GRN/GRY WIRE NON ECM WLK 02 MAIN FUSE FUSE OF ENGINE COMPT) RED WIRE SIG GROUND TO AUXILIARY HEATER COOLANT PUMP RELAY (DIAGRAM 2 OF 5) TOP OF ENGINE) VIO/BRN WIRE VIO/DK BLU WIRE YEL WIRE

37 18 19 (NOT USED) 5-VOLT REF 1 A/C REFRIGERANT PRE SNSR LO REF A/C COMPRESSOR CLUTCH RLY CTRL APP 5-VOLT REF 3 (2) APP SIG (2) A/C REFRIGERANT PRE SENS SIG ACCELERATOR PEDAL POSITION SENSOR (LEFT SIDE OF DASH) AIR CONDITIONING SYSTEM APP 5-VOLT REF 4 (1) APP SIG (1) APP LO REF (1) BLK WIRE BLK/BLU WIRE BLK/BRN WIRE BLK/GRN WIRE BLK/LT GRN WIRE BLK/VIO WIRE BLK/YEL WIRE BLU/GRY WIRE BLU/WHT WIRE BRAKE POSITION SNSR SIG BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CHECK ENGINE INDICATOR CTRL COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM DK BLU WIRE DK BLU/GRN WIRE DK BLU/WHT WIRE DK BLU/YEL WIRE ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) ENGINE OIL ENGINE OIL PRESSURE IND LEVEL IND FUEL COMPOSITION SENSOR FUEL PUMP CTRL GRN WIRE GRN/GRY WIRE GRN/WHT WIRE GRY WIRE HI SPEED COOLING FAN RLY CTRL IGN INSTRUMENT CLUSTER LEFT FRONT STRUT TOWER) LO SPD GMLAN SERIAL DATA LOGIC LOW REF FUEL TANK PRE SNSR SIG LT GRN WIRE MALFUNCTION IND PRIMARY FUEL LEVEL SNSR SIG FUEL LEVEL SNSR LO REF SECONDARY FUEL LEVEL SNSR SIG RED/BRN WIRE RUN/CRANK IGNITION 1 VOLT BATTERY POSITIVE VOLTAGE APP LO REF (2) SECONDARY FUEL LEVEL SENSOR (AWD) (TOP OF FUEL TANK) SENS SIG SENS SIG BAROMETRIC PRESSURE SNSR SIG SIG SUPPLY VOLT SENS GND VIO/DK BLU WIRE VIO/LT GRN WIRE WHT WIRE WHT/GRY WIRE WHT/RED WIRE YEL/RED WIRE YEL/WHT 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