Buick LaCrosse II facelift (2013-2016) (bottom of left "a" pillar) Wiring diagrams

2.4L 24 25 GMLAN SERL DATA (+) GMLAN SERL DATA (-) 3.6L 5 VOLT REF 7 13 SENS SIG SPLY VOLT ABS IND. BLK WIRE BLK/BRN WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BLU/YEL WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE IND BRAKE PEDAL POSITION SENSOR (NEAR TOP OF ACCELERATOR BRN WIRE CENTER CONSOLE MULTI-FUNCTION SWITCH COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEMS DRIVER INFORMATION CENTER DISPLAY ENGINE CONTROL MODULE (ECM) (LEFT FRONT OF ENGINE COMPT) ESC OFF IND GRN WIRE GRN/BRN WIRE GRY WIRE GRY/RED WIRE HI SPD GMLAN HI SPD GMLAN SERIAL DATA HI SPD GMLAN SERIAL DATA (-) (2) HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV POWERTRAIN CONTROL MODULE INSTRUMENT CLUSTER LOGIC LOW REF LT GRN/BLK WIRE PARK BRAKE CONTROL SWITCH (ON PARK BRAKE ASSEMBLY) PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) PEDAL ASSEMBLY) SENS SIG SRL DATA BUS+ STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SUPPLY VOLT SUPPLY VOLTAGE SW SIG TCS/ ESC IND TRACTION CONTROL OFF IND TRACTION CONTROL SWITCH VIO WIRE WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/RED WIRE

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

23 22 COMM ENABLE WAKEUP SERIAL DATA 23 24 22 HI SPD DATA - HI SPD DATA + 9 16 24 25 NETWORK BUS 2 NETWORK BUS 1 HI SPD DATA + HI SPD DATA - BLK WIRE BLU WIRE BLU/YEL WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE DATA LINK CONNECTOR (LEFT SIDE OF DASH) DK BLU WIRE DLC FUSE BCM 3 FUSE GRN WIRE GRN/BLU WIRE GRN/BRN WIRE GRN/GRY WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND DISTRIBUTION SYSTEM GRY/VIO WIRE HOT AT ALL TIMES HS SERIAL DATA - IMMOBILIZER CONTROL MODULE (CENTER CONSOLE) INSTRUMENT PANEL INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LINEAR INTERCONNECT NETWORK BUS 4 LO SPD GMLAN SER DATA LOGIC LEFT REAR WINDOW SWITCH LOGIC RIGHT REAR WINDOW SWITCH LT GRN/GRY WIRE NETWORK BUS 11 NETWORK BUS 2 NETWORK BUS 3 NETWORK BUS 4 RED/GRN WIRE RED/WHT WIRE STEERING WHEEL ANGLE SENSOR TRANSMISSION SHIFT LEVER POSITION INDICATOR VIO/YEL WIRE W/ KEYLESS ENGINE START SWITCH WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/VIO WIRE

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

BLK WIRE CIRCUIT COURTESY LAMP DOME LAMP SWITCH DRIVER OUTSIDE REARVIEW MIRROR DRIVER OUTSIDE REARVIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REARVIEW MIRROR LAMP ASSEMBLY GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/GRN WIRE GRY/LT GRN WIRE INSTRUMENT ILLUMINATION INSTRUMENT ILLUMINATION CIRCUIT INSTRUMENT PANEL MULTI-FUNCTION SWITCH 2 LEFT FRONT DOME/ READING LAMPS LEFT TAILLAMP ASSEMBLY LT GRN/BRN WIRE ORG/BLK WIRE PASSENGER OUTSIDE REARVIEW MIRROR PASSENGER OUTSIDE REARVIEW MIRROR COURTESY LAMP PASSENGER OUTSIDE REARVIEW MIRROR LAMP ASSEMBLY REAR DOME/READING LAMPS REAR PARKING ASSIST CONTROL MODULE (CENTER OF REAR PACKAGE SHELF) RIGHT FRONT DOME/ READING LAMPS RIGHT INSTRUMENT PANEL SPLICE PACK 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

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

BLK WIRE BLOWER MOTOR CONTROL MODULE BODY CONTROL MODULE BRN WIRE DRIVER BACK SEAT BLOWER MOTOR DRIVER CUSHION SEAT BLOWER MOTOR DRIVER DRIVER SEAT SEAT ADJUSTER LUMBAR SWITCH SUPPORT PUMP DRIVER LEFT REAR SEAT HAPTIC MOVEMENT MOTOR DRIVER RIGHT REAR SEAT HAPTIC MOVEMENT MOTOR DRIVER SEAT LUMBAR SUPPORT VALVE ASSEMBLY DRIVER WINDOW MOTOR FROM SPLICEPACK GRY/BLU WIRE INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE LEFT REAR DRIVER WINDOW WINDOW SWITCH SWITCH PASSENGER BACK SEAT BLOWER MOTOR PASSENGER CUSHION SEAT BLOWER MOTOR PASSENGER PRESENCE MODULE PASSENGER SEAT ADJUSTER SWITCH PASSENGER SEAT LUMBAR SUPPORT PUMP PASSENGER SEAT LUMBAR SUPPORT VALVE ASSEMBLY PASSENGER WINDOW MOTOR RIGHT REAR SEAT COURTESY LAMP RIGHT REAR WINDOW SWITCH W/ 4 WAY MANUAL PASSENGER ADJUSTER SEAT W/ ADAPTIVE CRUISE CONTROL W/ CUSTOM INTERIOR PACKAGE LAMP W/ FRONT PASSENGER VENTILATED SEAT W/ MEMORY W/ MULTI-DIRECTIONAL POWER ADJUSTER PASSENGER SEAT W/O ADAPTIVE CRUISE CONTROL W/O MEMORY

BATTERY FUSE BLOCK (TOP OF BATTERY) BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN/GRY WIRE BRN/WHT WIRE FUSE 5 GRN/WHT WIRE GROUND DISTRIBUTION SYSTEM PNK WIRE HORN ASSEMBLY (RIGHT FRONT OF VEHICLE) HORN FUSE HORN RELAY HORN RLY CTRL HORN SW SIG HORN SWITCH HOT AT ALL TIMES NCA WIRE PNK PNK WIRE PNK WIRE RED WIRE RIGHT STEERING WHEEL CONTROLS SWITCH STEERING WHEEL AIR BAG COIL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY)

22 1 SERIAL DATA BATT POS VOLT AIR BAG COIL AUTO BCM 3 FUSE BLK WIRE BLK/DK BLU WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) CENTER CONSOLE MULTI-FUNCTION SWITCH COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DIMMER SWITCH DK BLU WIRE DOME LAMP SWITCH DRIVER DOOR LOCK SWITCH DRIVER SEAT MEMORY SWITCH (W/ MEMORY) FOG LAMP SWITCH GARAGE DOOR OPENER SUNROOF SUNSHADE GRN WIRE HDLP SW PARK LP SIG HEAD HEAD-UP DISPLAY SWITCH (IF EQUIPPED) HEADLAMP SWITCH HORN SWITCH HOT AT ALL TIMES IGNITION MODE SWITCH (W/ KEYLESS ENGINE INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LED BACK LEFT FRONT DOME/ READING LAMPS LEFT STEERING WHEEL CONTROLS SWITCH LEFT TAILLAMP ASSEMBLY LIGHT CTRL SW REF LIGHT CTRL SW SIG LIGHT DIMMING CONTROL LOW REF LT GRN WIRE OFF ORG/VIO WIRE OUTSIDE REARVIEW MIRROR SWITCH (W/O MEMORY) PARK PARKING ASSIST ON/ OFF SWITCH (W/ REAR PARKING ASSIST) PARKING BRAKE CONTROL SWITCH (BEHIND LEFT REAR WHEEL LINER) PASSENGER DOOR LOCK SWITCH PASSENGER WINDOW SWITCH PNK WIRE REAR DOME READING LAMPS REAR WINDOW SUNSHADE SWITCH (IF EQUIPPED) RED/WHT WIRE RIGHT FRONT DOME/ READING LAMPS RIGHT STEERING WHEEL CONTROLS SWITCH SEAT MEMORY CONTROL MODULE (W/ MEMORY) (UNDER DRIVER'S SEAT) SERIAL DATA LOGIC STEERING WHEEL) SUNROOF SWITCH (IF EQUIPPED) SWITCH VIO WIRE W/ MEMORY W/O MEMORY YEL WIRE YEL/BLK WIRE