Buick LaCrosse II facelift (2013-2016) lt grn/yel 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

2 1 LR DOOR AJAR SW SIG NETWORK BUS 4 6 5 RR DOOR AJAR SW SIG NETWORK BUS 4 AJAR SW SIG BLK WIRE BRN WIRE CENTER CONSOLE CUPHOLDER ACCENT LAMP COMPUTER DATA LINES SYSTEM DRIVER DOOR HANDLE FLOOD LAMP DRIVER DOOR LATCH ASSEMBLY DRIVER DOOR PULL HANDLE FLOOD LAMP GRN/YEL WIRE GROUND DISTRIBUTION GRY WIRE HANDLE FLOOD LAMP LEFT INSTRUMENT PANEL ACCENT LAMP LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR DOOR PULL HANDLE LAMP LEFT REAR WINDOW SWITCH LEFT TAILLAMP ASSEMBLY LT GRN/GRY WIRE LT GRN/YEL WIRE NCA WIRE NETWORK BUS 3 OVERHEAD CONSOLE ACCENT LAMP PASSENGER DOOR LATCH ASSEMBLY PASSENGER DOOR) PASSENGER LEFT REAR DOOR DOOR PULL HANDLE FLOOD LAMP HANDLE FLOOD LAMP RED WIRE RIGHT INSTRUMENT PANEL ACCENT LAMP RIGHT REAR DOOR HANDLE FLOOD LAMP RIGHT REAR DOOR PULL HANDLE LAMP RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH SYSTEM W/ CUSTOM INTERIOR PACKAGE LAMP WHT WIRE WHT/YEL WIRE YEL/ WHT 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

4 6 NETWORK BUS 3 AJAR SW SIG ACTR RECEIVE SIG ACTR RTN ACTR SPLY VOLT ACTR TRANSMIT SIG AJAR SW SIG ANT LO REF (2) ANT LO REF (5) ANT SIG (1) ANT LO REF (1) ANT SIG (2) ANT SIG (5) BLK WIRE BLK/BRN WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM LOGIC DK BLU WIRE DK BLU/VIO WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER EXTERIOR DOOR HANDLE SWITCH DRIVER INFORMATION CENTER DISPLAY SECURITY IND DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH GMLAN SERIAL DATA GRN WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/DK BLU WIRE GRY/YEL WIRE INSTRUMENT CLUSTER KEYLESS ENTRY ANTENNA KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR EXTERIOR DOOR HANDLE ASSEMBLY LEFT REAR EXTERIOR DOOR HANDLE SWITCH LT GRN WIRE LT GRN/WHT WIRE LT GRN/YEL WIRE NETWORK BUS 3 ORG/ WIRE PACK) PASS DR UNLATCH SW SIG DRV DR UNLATCH SW SIG PASSENGER DOOR HANDLE KEYLESS ENTRY ANTENNA PASSENGER EXTERIOR DOOR HANDLE SWITCH PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) REAR FASCIA KEYLESS ENTRY ANTENNA (IF EQUIPPED) (BEHIND REAR BUMPER) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER (ON PASSENGER SIDE C-PILLAR) RIGHT REAR EXTERIOR DOOR HANDLE ASSEMBLY RIGHT REAR EXTERIOR DOOR HANDLE SWITCH STATUS CTRL UNLOCK SIGNAL VIO WIRE VIO/GRY WIRE WHT/GRN WIRE WHT/VIO WIRE YEL WIRE YEL/DK BLU 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

4 6 NETWORK BUS 3 AJAR SW SIG ACTR RECEIVE SIG ACTR RTN ACTR SPLY VOLT ACTR TRANSMIT SIG AJAR SW SIG ANT LO REF (2) ANT LO REF (5) ANT SIG (1) ANT LO REF (1) ANT SIG (2) ANT SIG (5) BLK WIRE BLK/BRN WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM LOGIC DK BLU WIRE DK BLU/VIO WIRE DRIVER DOOR LATCH ASSEMBLY DRIVER EXTERIOR DOOR HANDLE SWITCH DRIVER INFORMATION CENTER DISPLAY SECURITY IND DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH GMLAN SERIAL DATA GRN WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/DK BLU WIRE GRY/YEL WIRE INSTRUMENT CLUSTER KEYLESS ENTRY ANTENNA KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR EXTERIOR DOOR HANDLE ASSEMBLY LEFT REAR EXTERIOR DOOR HANDLE SWITCH LT GRN WIRE LT GRN/WHT WIRE LT GRN/YEL WIRE NETWORK BUS 3 ORG/ WIRE PACK) PASS DR UNLATCH SW SIG DRV DR UNLATCH SW SIG PASSENGER DOOR HANDLE KEYLESS ENTRY ANTENNA PASSENGER EXTERIOR DOOR HANDLE SWITCH PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) REAR FASCIA KEYLESS ENTRY ANTENNA (IF EQUIPPED) (BEHIND REAR BUMPER) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER (ON PASSENGER SIDE C-PILLAR) RIGHT REAR EXTERIOR DOOR HANDLE ASSEMBLY RIGHT REAR EXTERIOR DOOR HANDLE SWITCH STATUS CTRL UNLOCK SIGNAL VIO WIRE VIO/GRY WIRE WHT/GRN WIRE WHT/VIO WIRE YEL WIRE YEL/DK BLU WIRE

BLK WIRE BLU/VIO WIRE BRN/YEL WIRE BUS 4 COMPUTER DATA LINES SYSTEM DK BLU/GRY WIRE DK BLU/VIO WIRE DOOR LOCKS SYSTEM DOWN DRIVER WINDOW MOTOR (DRIVER'S DOOR) DRIVER WINDOW SWITCH EXPRESS EXPRESS STATUS SIG GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HOT AT ALL TIMES ILLUMINATION INDICATOR LEFT FRONT LEFT REAR LEFT REAR WINDOW MOTOR (LEFT REAR DOOR) LEFT REAR WINDOW SWITCH LOCKOUT INDICATOR LOGIC LR DOWN CTRL LR DR AJAR SW SIG LR UP CTRL LT GRN/BLK WIRE LT GRN/GRY WIRE LT GRN/YEL WIRE MIR EWL FR FUSE NETWORK 3 DOWN NETWORK BUS 3 PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) PASSENGER WINDOW SWITCH RED/BLU WIRE RED/VIO WIRE RED/WHT WIRE RF DOWN SIG RF DR AJAR SW SIG RF EXPRESS SIG RF UP SIG RIGHT FRONT RIGHT REAR RIGHT REAR WINDOW MOTOR (RIGHT REAR DOOR) RIGHT REAR WINDOW SWITCH RR DOWN CTRL RR UP CTRL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) UNLCK SIG UP VIO/GRY WIRE WDO FRT FUSE WDO RR FUSE WHT/VIO WIRE WINDOW LOCK SWITCH WINDOW SWITCH YEL/BLK WIRE YEL/DK BLU WIRE

AJAR AJAR SW SIG BCM 7 FUSE BLOCK FUSE (LOWER LEFT SIDE OF DASH) BLK WIRE BLK/ORG WIRE BLU WIRE BLU/ WHT WIRE BLU/BLK WIRE BLU/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE IND BRN WIRE BRN/GRN WIRE BUS 4 COMPUTER DATA LINES SYSTEM DK BLU RED/ WIRE DLIS FUSE DRIVER DOOR LATCH ASSEMBLY DRIVER INFORMATION CENTER DISPLAY DRIVER SEAT BELT BUCKLE DRIVER SEAT BELT SWITCH DRIVER WINDOW MOTOR DRIVER WINDOW SWITCH DRIVER'S DOOR GMLAN SER DATA RADIO GMLAN SERIAL DATA GRN WIRE GRN/GRY WIRE GROUND GRY WIRE GRY/ GRN WIRE GRY/RED WIRE HEAD PARK 5 6 AUTO OFF HEADLAMP SW 22 11 1 PRK LAMP SIG OFF SIG HEADLAMP SWITCH HOT AT ALL TIMES INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (SDM) (BELOW CENTER CONSOLE) INSTRUMENT CLUSTER INSTRUMENT PANEL LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LO SPD GMLAN SER DATA LOGIC LOW ENGINE OIL PRESSURE IND LOW SPD GMLAN SER DATA SER DATA COMMUNICATION ENABLE LOW TIRE PRESSURE IND LT GRN/GRY WIRE LT GRN/YEL WIRE NCA WIRE NETWORK NETWORK BUS 3 NETWORK BUS 4 OFF KEY IGNITION SWITCH IGNITION SWITCH (W/O KEYLESS ENGINE START SWITCH) OFF/RUN/ CRANK VOLT ORG/BRN WIRE PARK BRAKE CONTROL SWITCH (ON PARK BRAKE ASSEMBLY) PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) PASSENGER DOOR LATCH ASSEMBLY PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) PRK BRK APPLY SW VOLT REF PRK BRK SW SUP VOLT PRK BRK SW SIG PRK BRK SW SUPP VOLT PRK BRK SW RELEASE SIG PRK BRK SW APPLY SIG RED WIRE RED/DK BLU WIRE RED/LT GRN (OR RED/GRN) WIRE RED/LT GRN WIRE RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH RUN WIRE SEAT BELT IND SEAT BELT SW LOW REF SEAT BELT SW SIG SER DATA LVL COMM SENS ENABLE SIG SERIAL DATA COMM ENABLE SPLICE PACK) (LEFT KICK PANEL) SW SIG VIO WIRE WHT WIRE WHT/BLU WIRE WHT/DK BLU WIRE WHT/YEL WIRE YEL WIRE YEL/RED 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